Use Java Logging mechanism

We have a requirement to log application errors in a local log file in the form of key/value pairs (from a property object) after every transaction, append to the previous transaction and generate one log file for each day.
Log file example,
currentTime=xxxx
message=xxxxx
userId=xxxx
etc.
What would be the best way to do it ? Can I take advantage of the Java Logging API, like file handler , although it does not do exactly what I wanted ?

Thanks for the reply. But the company standard does
not allow open source package like log4j.Then the company standard is completely nuts... but they're like that aren't they... I'd still get a copy of the log4j source from the apache site, to use a working example of how to do it well... then maybe write a simplified "write behind" logging service based on it... a single format "log4j-lite"
Have fun with it.
Keith.

Similar Messages

Using Java Logging with WebLogic 8.1

Hello,
I am having problems getting custom Handlers to load using the Java 1.4 Logging
API. Apparently, the custom Handlers are loaded using the System classpath, not
the applications classpath. This is not a viable option for us, does anyone know
of a workaround for this?
Thank you,
Josh

Hello Staffan,
I've just sent to you the code source for this class. By the way I didn't try changing the swing JVM.
Dom
Hi,
This looks like a bug to me. Does it matter which JVM
you use for the swing application?
To be able to find out more about the problem it
would be great if we could look at the class files
for
com.dexia.sofaxis.prestations.business.TypeElementMate
riel and all it's superclasses and interfaces. Please
contact me offline at sta_larsen(at)hotmail (yes, I
work for BEA, but I don't like spam...).
Regards,
/Staffan

Using Java Logging with Tomcat

Hi in a previous non Tomcat project I wrote some classes that used the java.util.logging library that comes with java 1.4 quite successfully. I am now trying to use the same classes with Tomcat 5.0 but it doesnt like it. With the logging classes you can provide a configuration class which you define with a property "java.util.logging.config.class", I put the class in my WEB_INF\classes with all the other classes.
When I run with Tomcat i have a servlet that does the following to try and initilse the logging
com.appserver.util.logging.LogProperties.setLevelFromParametersFromPrefs();
System.getProperties().setProperty("java.util.logging.config.class", "com.appserver.util.logging.LogProperties");
LogManager.getLogManager().readConfiguration();
it complains it cant find the class, when running readConfiguration(), (The 1st two lines run ok). I think the problem is to do with Tomcat classloader, with a simple Java application the classes would be expected to be on the system classpath, but on Tomcat the system classpath only contains bootstrap.jar.
I realise I could probably get things working using Apaches log4j instead but it seems a bit silly to use that when there is a perfectly adequate logger built into the language now.
Anyone done this ?

OK
Ive changed my code from
com.appserver.util.logging.LogProperties.setLevelFromParametersFromPrefs();
System.getProperties().setProperty("java.util.logging.config.class", "com.appserver.util.logging.LogProperties");
LogManager.getLogManager().readConfiguration();to
com.appserver.util.logging.LogProperties.setLevelFromParametersFromPrefs();
LogManager.getLogManager().readConfiguration(com.appserver.util.logging.LogProperties.getPropertiesAsStream());Now I dont get any errors and only messages for the LEVEL is set to the value I specify in my LogProperties class are displayed. However I also specify a Formatter to use for console output but Tomcat just seems to ignore it and uses its own default formatter. Any ideas...please !

Applet + Java Logging

Currently i'm using java logging on java applet.
i try to change the formatter using my custom made formatter
so the configuration will become :
java.util.logging.FileHandler.level = INFO
java.util.logging.FileHandler.formatter = com.xyz.logging.CustomFormatter
but seems the applet always load the default formatter.
I'll already try using the application (JFrame) and it work fine.
And also if i change 'handlers' to my own handler it will throw me classnotfoundexception
Help....
Message was edited by:
Isyak

With an applet you can't control the command line properties, so you are probably picking up the default logging.properties from the client's JVM installation.
You can't write to a file, of course, unless your applet is signed.

Reg - Error Logging Mechanism

Create table r_dummy
a number,
DATE_COL date,
constraint unq_a unique(a)
dbms_errlog.CREATE_ERROR_LOG('R_DUMMY');
Begin
     Insert
          when (a = 1) then
               into r_dummy(a,DATE_COL) values(a,SYSDATE)
          when (a != 1) then
               into r_dummy(a,DATE_COL) values(a,SYSDATE+A)
     select level a from dual connect by level < 50
     log errors into err$_r_dummy('INSERT') reject limit 25;
End;Error After Executing above code.
log errors into err$_r_dummy('INSERT') reject limit 25;
ERROR at line 9:
ORA-06550: line 9, column 2:
PL/SQL: ORA-00933: SQL command not properly ended
ORA-06550: line 3, column 2:
PL/SQL: SQL Statement ignoredSo,whats wrong with my code ??Are there any restrictions in using error logging mechanism?? Could'nt I use it with 'INSERT WHEN' ,if so what is the alternative . I don't want to use 'WHEN OTHERS THEN' Exception handler.
Please help me.
Regards
Raghu.

SQL> drop table err$_r_dummy purge;
Table dropped.
SQL> drop table r_dummy purge;
Table dropped.
SQL> SELECT SYS_CONTEXT('USERENV','SID')
2 FROM DUAL;
SYS_CONTEXT('USERENV','SID')
73
SQL> Create table r_dummy
2 (
3   a number,
4   DATE_COL date,
5   constraint unq_a unique(a)
6 );
Table created.
SQL> exec dbms_errlog.create_error_log('R_DUMMY');
PL/SQL procedure successfully completed.
SQL> select count(*) from err$_r_dummy;
COUNT(*)
         0
SQL> Begin
2   Insert
3      when (a = 1) then
4      into r_dummy (a,DATE_COL) values (a,SYSDATE)
5      log errors into err$_r_dummy('INSERT') reject limit 25
6      when (a != 1) then
7      into r_dummy(a,DATE_COL) values (a,SYSDATE+A)
8      log errors into err$_r_dummy('INSERT') reject limit 25
9   select level a from dual connect by level < 50;
10
11 End;
12 /
PL/SQL procedure successfully completed.
SQL> select count(*) from r_dummy;
COUNT(*)
        49
SQL> select count(*) from err$_r_dummy;
COUNT(*)
         0
           Now,I run the same piece of code
SQL> Begin
2   Insert
3      when (a = 1) then
4      into r_dummy (a,DATE_COL) values (a,SYSDATE)
5      log errors into err$_r_dummy('INSERT') reject limit 25
6      when (a != 1) then
7      into r_dummy(a,DATE_COL) values (a,SYSDATE+A)
8      log errors into err$_r_dummy('INSERT') reject limit 25
9   select level a from dual connect by level < 50;
10
11 End;
12 /
Begin
ERROR at line 1:
ORA-00001: unique constraint (PHASE36DEV_11G.UNQ_A) violated
ORA-06512: at line 2
Error logging mechanism fails :(
SQL> select count(*) from r_dummy;
COUNT(*)
        49
SQL> select count(*) from err$_r_dummy;
COUNT(*)
        27Different session
SQL> SELECT SYS_CONTEXT('USERENV','SID')
2 FROM DUAL;
SYS_CONTEXT('USERENV','SID')
219
SQL> select count(*) from err$_r_dummy;
COUNT(*)
        27
SQL> select count(*) from r_dummy;
COUNT(*)
         0Here it has been proved that error logging is an autonomous transaction.
Back to my original session.
SQL> rollback;
Rollback complete.
SQL> select count(*) from r_dummy;
COUNT(*)
         0
SQL> select count(*) from err$_r_dummy;
COUNT(*)
        27Now I change my piece of code as below
SQL> Begin
2   Insert
3      when (a = 1) then
4      into r_dummy (a,DATE_COL) values (a,SYSDATE)
5      log errors into err$_r_dummy('INSERT') reject limit 25
6      when (a != 1) then
7      into r_dummy(a,DATE_COL) values (a,SYSDATE+A)
8      log errors into err$_r_dummy('INSERT') reject limit 25
9   select level+48 a from dual connect by level < 50;
10
11 End;
12 /
PL/SQL procedure successfully completed.This runs fine without throwing any error !!!!!!!!
Now I check my log table
SQL> select count(*) from err$_r_dummy;
COUNT(*)
        27Twist....count remains same. I thought it'll be increment by 1(as the unique constraint violation occurs for 49) ????
My observations
================
1)Error Logging mechanism fails when same set of rows are repeated.
2)Error log table has a composite unique constraint on all the columns.
3)error logging is an autonomous transaction.
Conclusion : Now, I'm afraid to use this :(

Using java.util.logging Properly

Hello,
I have implemented java.util.logging in my application by creating a kind of "wrapper" class that I call for handling logging. It doesn't extend the logging classes, it just provides an object with helper methods that I can call when I want it.
public class LogCleanerLogger {
    private static final String cleanerLogfile = "logcleanerlog%g.txt";
    private static final String loggerName = "LogCleaner";
    private Logger cleanerLogger = null;
    public LogCleanerLogger() throws IOException{
        this.cleanerLogger = Logger.getLogger(getLoggerName());
        cleanerLogger.setUseParentHandlers(false);
        FileHandler logFile = new FileHandler(getCleanerLogfile(),10000,1, true);
        logFile.setFormatter(new SimpleFormatter());
        cleanerLogger.addHandler(logFile);
    public void writeLogInfoMessage(String message){
        cleanerLogger.info(message);
    public void writeLogWarningMessage(String message){
        cleanerLogger.warning(message);
    public void writeLogErrorMessage(String message){
        cleanerLogger.severe(message);
// getters and setters
} // end class    This all works quite happily and I can log any information I want. Except for one thing -- my log directory ends up with the log file (logcleanerlog0.txt) and a list of what appear to be temporary logs, e.g. logcleanerlog0.txt.1, logcleanerlog0.txt.2, and so on. Each increment of the number corresponds to a log file that has progressively less information in it that the previous one. At the top level, the unnumbered log, logcleanerlog0.txt, has all the logged information in it.
I cannot make out, from reading the API and other documentation, how I can get rid of these other files, which appear to me to be temporary files used in the construction of the top level file.
Can someone help me by explaining the mechanism for generating these files and either (a) how I can get rid of them altogether or (b) how I can arrange for them to be generated in a temp dir, while keeping the main log in the present directory (application root).
Or perhaps there is a "better way" (that is equally as easy, of course ;-).
Thanks.
mp

are you sure you cannot use the classes from a newer
version. You can put those classes in your own
directory. If there ar some other classes that need to
be from the newer version, you can include them, also
in your project. It is important that your project
directory to be placed in the classpath variable
before the jdk jars.
(this solution might not work)I doubt that is worth trying.
First, although it probably does not apply in this case, you are not allowed to distribute part of a JVM. So you could never use this solution in a commercial application.
Secondly the Java API does change. And every execution path that might use the changed code would have to be tested. That is going to take a lot of work. Keep in mind that the logging api uses java.lang.String and java.lang.String definitely changed in 1.4 and almost every class in the Java API uses it.

HT5945 Java has updated again today, i use a jave plug in to run my virtual software to access my work from home, today i have an error message saying security will not allow access to my website that i use to log in to work from, this is a JREdetection e

Java has updated again today,
i use a java plug in to run my virtual software to access my work from home,
today i have an error message saying that security will not allow access to my website
i use to log in to work from, this is a JREdetection error,
my system runs off java and citrix, i tried chrome,firefox and safari - same issue, if my system cannot detect java it wont run, it runs on plug ins.
How to i change my sec settings to allow access to this website, as i can only see that i can add apps not web addresses?

If you get an error that says can't backup, try moving the existing backup file to a safe location and thry again. again. You can find the location of the backup file here:
iPhone and iPod touch: About backups

How to include Logs/log4j in SOA with out using java embedding activity

Hi,
I have a requirement where I need to log the values of a particular variable and need to store it in a new log file. Is there any way to log the details with out using java embedding activity.
Thanks,

You can try this.
http://veejai24.blogspot.co.uk/2008/04/simple-way-to-implement-log4j-in-your.html
Thanks,
Vijay

Practical use of Java Logging API

There was a recent technical tip about the Java Logging API, but after reading it I still don't understand how to use it in a real situation.
Can anyone help me with this with a practical example?
At the moment I have try-catch clauses that catch exceptions and print a message in a System.err log that I can consult if there's a specific problem.
How should I be using the Logging API? I feel sure that it can help me, but can't see how.
Thanks for any practical information.

What if you don't want to write to system.err anymore? What if you need to write something to the windows event log? What if system.err is irrelevant (nt service), ...
Btw, lots of examples on the JDK1.4 logging api:
http://www.esus.com/docs/GetIndexPage.jsp?uid=265

How to access sharepoint logs using Java?

Is there a way to access Sharepoint logs using Java from a remote machine?
Any help / pointers would be appreciated. Thanks.

Hello,
I am not aware about any client modal class for log but if you create your own service and host in SP server then you can call this web service in JAVA. (i am not sure whether JAVA supports .NET web service or not).
You can refer this for web service:
http://www.arboundy.com/2010/12/centalised-view-of-sharepoint-uls-log-files/
Hope it could help
Hemendra:Yesterday is just a memory,Tomorrow we may never see
Please remember to mark the replies as answers if they help and unmark them if they provide no help

Logging in on website using java

Hello,
I am quite inexperienced when it comes to java programming, so my apologies if I post this in the wrong section.
I am trying to open a website using java. So far I succeeded in reading the source code through java, which is about halfway I want to get. However, for getting the information I want, I need to login on the website with my account. I have no idea how something like that should be done. Cookies are used to login, and I am using BlueJ for my program. Could anyone help me out with an example or explanation on how this is done?
Thanks in advance,
Tybs

I downloaded the httpclient tool, it looks promising. I managed to open it in blueJ, so far so good... the only problem now is that I can't compile it. Each class gives me an error message. This one, for example:
import test.com.meterware.httpunit.*;
package test.com.meterware.httpunit does not exist
I found the necessary packages in the tool itself, but I have no idea how I can specify the path to them, or how I can add them to the packages that java already has. What do I need to do for this?
Thanks for the information so far, it really helps :D
Greetz,
Tybs

ORA-04030: out of process memory when using Java Stored Procedures

Hello,
I have a problem using Java Stored Procedures in Oracle 10g.
My Java application performs http posts to a webservice and the response is parsed in order to populate some DB tables.
There is a scheduled job which calls the Java Stored Procedure every x minutes.
No matter of the 'x minutes' values - after about 160 - 200 calls I get this error:
ORA-04030: out of process memory when trying to allocate 1048620 bytes (joxp heap,f:OldSpace)
ORA-04030: out of process memory when trying to allocate 2097196 bytes (joxp heap,f:OldSpace)
The job stops just while is posting the http request. The weird thing is that almost each time the first http post request I get this error:
java.net.ConnectException: Connection refused
     at java.net.PlainSocketImpl.socketConnect(Native Method)
     at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:305)
     at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:171)
     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:158)
     at java.net.Socket.connect(Socket.java:426)
     at com.sun.net.ssl.internal.ssl.SSLSocketImpl.connect(DashoA6275)
     at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at org.apache.commons.httpclient.protocol.ReflectionSocketFactory.createSocket(ReflectionSocketFactory.java:140)
     at org.apache.commons.httpclient.protocol.SSLProtocolSocketFactory.createSocket(SSLProtocolSocketFactory.java:130)
     at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:707)
     at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:387)
     at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
     at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
     at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:323)
and the second try works fine.
So, The out of process memory occured each time just before getting such an error, and I suspect to be a connection between these errors.
Tech details:
1. OS: WinXP
2. Oracle 10.1.0.2.0
3. To perform http post I use HttpClient 3.1 from Apache.
4. I checked the http connection to be closed each time, and this is done.
5. I checked the oracle statement and connection to be closed each time and this is done
6. The JVM error (logged in .trc files of Oracle) is:
java.lang.OutOfMemoryError
     at java.lang.Thread.start(Native Method)
     at sun.security.provider.SeedGenerator$ThreadedSeedGenerator.run(SeedGenerator.java:297)
DB Settings details:
Starting up ORACLE RDBMS Version: 10.1.0.2.0.
System parameters with non-default values:
processes = 200
sessions = 225
shared_pool_size = 159383552
large_pool_size = 8388608
java_pool_size = 104857600
nls_language = AMERICAN
control_files = C:\ORACLE\PRODUCT\10.1.0\ORADATA\XXXXXX\CONTROL01.CTL, C:\ORACLE\PRODUCT\10.1.0\ORADATA\XXXXXX\CONTROL02.CTL, C:\ORACLE\PRODUCT\10.1.0\ORADATA\XXXXXX\CONTROL03.CTL
db_block_size = 8192
db_cache_size = 29360128
compatible = 10.1.0
fal_client = XXXXXX
fal_server = XXXXXXs
log_buffer = 524288
log_checkpoint_interval = 100000
db_files = 70
db_file_multiblock_read_count= 32
db_recovery_file_dest = C:\oracle\product\10.1.0\flash_recovery_area
db_recovery_file_dest_size= 2147483648
standby_file_management = AUTO
undo_management = AUTO
undo_tablespace = undotbs_01
undo_retention = 14400
remote_login_passwordfile= EXCLUSIVE
db_domain =
dispatchers = (PROTOCOL=TCP) (SERVICE=XXXXXXXDB)
remote_dependencies_mode = SIGNATURE
job_queue_processes = 4
parallel_max_servers = 5
background_dump_dest = C:\ORACLE\PRODUCT\10.1.0\ADMIN\XXXXXX\BDUMP
user_dump_dest = C:\ORACLE\PRODUCT\10.1.0\ADMIN\XXXXXX\UDUMP
max_dump_file_size = 10240
core_dump_dest = C:\ORACLE\PRODUCT\10.1.0\ADMIN\XXXXXX\CDUMP
sort_area_size = 1048576
sort_area_retained_size = 1048576
db_name = XXXXXX
open_cursors = 500
optimizer_mode = FIRST_ROWS
pga_aggregate_target = 25165824
Any help would be appreciated. Thanks.
Can be a problem with JVM threading under Oracle ?

The server prcess failed to allocate more memory for large objects ( in Oldspace).
If you Google ORA-04030, you will see several recommendations to work around this.
The Java VM in the database already has HttpClient, i don't know why you are loading the Apache HttpClient but this might not be the surce of the problem.
Kuassi http://db360.blogspot.com

Socket example using Java 5

Last year I posted 4 programs that provided a simple client server using both stream sockets and NIO. I decided as an exercise in using Java 5 to port that code and try to use as many of the new features as possible. The following code is very long and does what all the previous example programs did. In replies do not repost the whole of this message.
It provides a simple chat like client and server. The user can request either a stream connection or a NIO connection or provide one of their own.
//========================== MsgSwitch.java ===========================//
package pkwnet.msgswitch;
import java.util.logging.Logger;
import java.util.logging.Level;
import java.util.logging.Handler;
* main class for message switch
* command line arguments are
* -p port number for server
* -s run server
* -a server ip address including port for client
* -i idle timer in seconds
* -n use NIO
* -c specify connection class
public class MsgSwitch {
    static private int errors = 0;
    static private String address = "127.0.0.1:6060";
    static private String connectionClass = "pkwnet.msgswitch.StreamConnection";
    static public void main(String [] args) {
        int port = 6060;
        int idleTime = 600;
        boolean server = false;
        boolean nio = false;
        Logger logger = Logger.getLogger("msgswitch");
        for(String arg : args) {
            if(arg.startsWith("-a")) {
                address = arg.substring(2);
            } else if(arg.startsWith("-p")) {
                port = argToInt(arg);
                server = true;
            } else if(arg.startsWith("-i")) {
                idleTime = argToInt(arg);
            } else if (arg.startsWith("-s")) {
                server = true;
            } else if (arg.startsWith("-c")) {
                connectionClass = arg.substring(2);
            } else if (arg.startsWith("-n")) {
                connectionClass = "pkwnet.msgswitch.NIOConnection";
            } else {
                String err = "unknown argument=" + arg;
                logger.severe(err);
                System.err.println(err);
                errors++;
        if (errors == 0) {
            if (server) {
                new Server().listen(port,idleTime, nio);
            } else {
                new Client().start(address, nio);
        } else {
            fail(errors + " errors encountered", null);
    static private int argToInt(String arg) {
        int val = 0;
        try {
            val = Integer.parseInt(arg.substring(2));
        } catch (NumberFormatException e) {
            String err = "invalid argument format: " + arg;
            Logger.getLogger("msgswitch").severe(err);
            System.err.println(err);
            errors++;
        return val;
    static public void fail(String err, Throwable e) {
        String msg = "Operation terminated: " + err;
        Logger.getLogger("msgswitch").log(Level.SEVERE, msg, e);
        System.err.println(msg);
        System.exit(12);
    static public Connection getConnection() {
        Connection conn = null;
        try {
            conn = (Connection) Class.forName(connectionClass).newInstance();
        } catch (Exception e) {
            fail ("connection class error", e);
        return conn;
    static public void logCaller(Logger logger, Level level) {
        String text = "CALLED";
        if (logger.isLoggable(level)) {
            try {
                throw new Exception("logging stack");
            } catch (Exception e) {
                StackTraceElement [] st = e.getStackTrace();
                if (st.length > 1) {
                    text += formatElement(st[1]);
                if (st.length >2) {
                    text += formatElement(st[2]);
            logger.log(level, text);
    static private String formatElement(StackTraceElement ste) {
        return "\n    " + ste.getClassName() + "." + ste.getMethodName()
            + "(" + ste.getFileName() + ":" + ste.getLineNumber() + ")";
//================= Client.java =============================================//
package pkwnet.msgswitch;
* a simple Swing chat GUI using Java 5 and sockets.
* @author PKWooster
* @version 1.0 August 31,2005
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.JTextArea;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JMenu;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JDialog;
import javax.swing.SwingUtilities;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.BorderLayout;
import static java.awt.BorderLayout.*;
client GUI class
public class Client extends JFrame implements ConnectionListener {
     // swing GUI components
     private JTextField userText = new JTextField(40);
     private JTextArea sessionLog = new JTextArea(24,40);
     private JTextField statusText = new JTextField(40);
     private JPanel outPanel = new JPanel();
     private JScrollPane sessionLogScroll = new JScrollPane(sessionLog);
     private JMenuBar menuBar = new JMenuBar();
     private JMenuItem startItem = new JMenuItem("Start");
     private JMenuItem hostItem = new JMenuItem("Host");
     private JMenuItem aboutItem = new JMenuItem("About");
     private JMenuItem abortItem = new JMenuItem("Abort");
     private JMenuItem exitItem = new JMenuItem("Exit");
     private JMenu fileMenu = new JMenu("File");
     private JMenu helpMenu = new JMenu("Help");
     private Container cp;
     private String address;
    private Connection connection;
    private boolean sendReady = false;
    private boolean nio = false;
     Client() {
    public void start(String address, boolean nio) {
        this.address = address;
        this.nio = nio;
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                runClient();
    private void runClient() {
        connection = MsgSwitch.getConnection();
        connection.addConnectionListener(this);
          buildMenu();
          cp = getContentPane();
          sessionLog.setEditable(false);
          outPanel.add(new JLabel("Send: "));
          outPanel.add(userText);
          // enter on userText causes transmit
          userText.addActionListener(new ActionListener(){
               public void actionPerformed(ActionEvent evt){userTyped(evt);}
          cp.setLayout(new BorderLayout());
          cp.add(outPanel,NORTH);
          cp.add(sessionLogScroll,CENTER);
          cp.add(statusText,SOUTH);
          setStatus("Closed");
          addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent evt) {
                mnuExit();
          pack();
        setVisible(true);
* attempt to send the contents of the user text field
    private void userTyped(ActionEvent evt) {
        if (sendReady) {
            String txt = evt.getActionCommand()+"\n";
            userText.setText("");
            toSessionLog("> ", txt);
            sendReady = false;
            connection.send(txt);
* append text to the session log
     private void toSessionLog(String prefix, String txt) {
          sessionLog.append(prefix + txt);
          sessionLog.setCaretPosition(sessionLog.getDocument().getLength() ); // force last line visible
* build the standard menu bar
     private void buildMenu()
          JMenuItem item;
          // file menu
          startItem.addActionListener(new ActionListener()
          {public void actionPerformed(ActionEvent e){mnuStart();}});
          fileMenu.add(startItem);
          hostItem.addActionListener(new ActionListener()
          {public void actionPerformed(ActionEvent e){mnuHost();}});
          fileMenu.add(hostItem);
          exitItem.addActionListener(new ActionListener()
          {public void actionPerformed(ActionEvent e){mnuExit();}});
          fileMenu.add(exitItem);
          menuBar.add(fileMenu);
          helpMenu.add(aboutItem);
          aboutItem.addActionListener(new ActionListener()
          {public void actionPerformed(ActionEvent e){mnuAbout();}});
          menuBar.add(helpMenu);
          setJMenuBar(menuBar);
* start and stop communications from start menu
     private void mnuStart() {
        if(connection.getState() == Connection.State.CLOSED) {
            connection.connect(address);
        } else {
            connection.disconnect();
* prompt user for host in form address:port
    private void mnuHost() {
          String txt = JOptionPane.showInputDialog("Enter host address:port", connection.getAddress());
          if (txt == null)return;
        address = txt;
     private void mnuAbout() {
          JDialog dialog = new JDialog(this, "About Client");
          JTextField text = new JTextField("Simple character client");
        dialog.getContentPane().add(text);
        dialog.pack();
        dialog.setVisible(true);
     // exit menu
     private void mnuExit() {
        exit();
    private void exit() {
          connection.disconnect();
          System.exit(0);
     private void setStatus(String st) {
        statusText.setText(st);
     private void setStatus(Connection.State state) {
        switch(state) {
            case OPENED:
                startItem.setText("Stop");
                setStatus("Connected to "+address);
                break;
            case CLOSED:
                startItem.setText("Start");
                setStatus("Disconnected");
                break;
            case OPENING:
                setStatus("Connecting to "+address);
                startItem.setText("Abort");
                break;
            case CLOSING:
                setStatus("Disconnecting from "+address);
                startItem.setText("Abort");
                break;
    public void stateChanged(final ConnectionEvent event) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                setStatus(event.getState());
    public void dataAvailable(final ConnectionEvent event) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                setStatus(event.getState());
                String txt = event.getData();
                if (txt == null) {
                    txt = "$null$";
                toSessionLog("< ", txt + "\n");
    public void sendAllowed(final ConnectionEvent event) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                setStatus(event.getState());
                sendReady = true;
    public void accept(ConnectionEvent event) {
//========================== Server.java ===============================//
package pkwnet.msgswitch;
import java.io.*;
import java.net.*;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
* a simple message switch using stream based socket i/o
* a very simple text message switching program
* user commands start with $ and consist of blank seperated arguments
* other lines sent by the user are forwarded
* $on nickname targets
*    sign on as nickname, sending to targets
* $to targets
*    change target list, reports current value
* $list nicknames
*    list status of specified nicknames
* $list
*    list all connected users
* $off
*    sign off
* @author PKWooster
* @version 1.0 September 1, 2005
public class Server {
    private ConcurrentHashMap<String, User> perUser = new ConcurrentHashMap<String,User>();
    private Timer idleTimer;
    private Connection conn;
    public void listen(int port, final int idleTime, boolean nio) {
        idleTimer = new Timer();
        idleTimer.scheduleAtFixedRate(new TimerTask(){public void run(){oneSec();}},0,1000);
        conn = MsgSwitch.getConnection();
        conn.addConnectionListener(new ConnectionListener() {
            public void stateChanged(ConnectionEvent event) {
            public void dataAvailable(ConnectionEvent event) {
            public void sendAllowed(ConnectionEvent event) {
            public void accept(ConnectionEvent event) {
                Connection uconn = event.getConnection();
                new User(uconn, perUser, idleTime);
        conn.listen(port);
        idleTimer.cancel();
    private void oneSec() {
        Collection<User> uc = perUser.values();
        for(User u : uc) {
            u.oneSec();
//================= User.java ==============================================//
package pkwnet.msgswitch;
import java.io.*;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Logger;
import java.util.logging.Level;
* defines the processing for a message switch user
* @author PKWooster
* @version 1.0 June 15,2004
public class User implements ConnectionListener {
    private ConcurrentHashMap<String, User> perUser;
    private String name;
    private String address;
    private boolean signedOn = false;
    private String[] targets;
    private AtomicInteger remainingTime;
    private int idleTime;
    Connection conn;
    Logger logger;
* construct a user, link it to its connection and put it in the perUser table
    User(Connection conn, ConcurrentHashMap<String,User>p, int idle) {
        this.conn = conn;
        logger = Logger.getLogger("msgswitch.user");
        conn.addConnectionListener(this);
        address = conn.getAddress();
        logger.info("creating user " + address);
        perUser = p;
        idleTime = idle;
        remainingTime = new AtomicInteger(idleTime);
        rename(address);
        targets = new String[0];
* process state changes
    public void stateChanged(ConnectionEvent event) {
        if(event.getState() == Connection.State.CLOSED) {
            close(false);
* data is available, process commands and forward other data.
    public void dataAvailable(ConnectionEvent event) {
        String msg = event.getData();
        if (msg.startsWith("$")) {
            doCommand(msg);
        } else {
            forward(msg);
        remainingTime.set(idleTime);
* do nothing for sendAllowed events
    public void sendAllowed(ConnectionEvent event) {
* do nothing for accept events
    public void accept(ConnectionEvent event) {
* called once per second by the server main thread.
    public void oneSec() {
        if(idleTime != 0 && 1 > remainingTime.decrementAndGet()) {
            close(true);
* send a message
    private void send(String msg) {
        conn.send(msg);
        remainingTime.set(idleTime);
* forward data messages to other users
* @param txt the message to send
    private void forward(String txt) {
        txt = name+": "+txt + "\n";
        if(0 < targets.length) {
            for(String target :targets) {
                User user = perUser.get(target);
                if(user != null) {
                    user.send(txt);
        } else {
            for (User user : perUser.values()) {
                if (user != this) {
                    user.send(txt);
* execute command messages, commands start with a $
* and contain arguments delimited by white space.
* @param command the command string
    private void doCommand(String command) {
        boolean good = false;
        command = command.substring(1).trim();
        if(command.length() > 0) {
            String [] args = command.split("\\s+");
            if(args[0].equals("on")) {
                good = signOn(args);
            } else if(args[0].equals("off")) {
                good = signOff(args);
            } else if(args[0].equals("list")) {
                good = listUsers(args);
            } else if(args[0].equals("to")) {
                good = setTargets(args,1);
            } else if(args[0].equals("idle")) {
                good = setIdle(args);
            if(!good) {
                send("invalid command=" + command + "\n");
* sign on command
    private boolean signOn(String [] args) {
        boolean good = false;
        if(args.length >1) {
            String nm = args[1];
            logger.info("signing on as: " + nm);
            if(rename(nm)) {
                conn.setName(name);
                send("Signed on as " + name + "\n");
                signedOn = true;
                good = true;
                setTargets(args,2);
            } else {
                send("name="+nm+" already signed on\n");
        return good;
* set forwarding targets
    private boolean setTargets(String [] args, int start) {
        if(start < args.length) {
            targets = new String[args.length-start];
            System.arraycopy(args, start, targets, 0, targets.length);
        String str = "to=";
        for(String target : targets) {
            str += (target + " ");
        send(str+"\n");
        return true;
* set idle timeout
    private boolean setIdle(String[] args) {
        try {
            idleTime = new Integer(args[1]).intValue();
            remainingTime.set(idleTime);
            send("idle time set to "+idleTime+"\r\n");
            return true;
        } catch(NumberFormatException exc) {
            return false;
* sign off
    private boolean signOff(String [] args) {
        close(true);
        return true;
* list connected users
    private boolean listUsers(String [] args) {
        TreeSet<String> allUsers = new TreeSet<String>(perUser.keySet());
        HashSet<String> t = new HashSet<String>(Arrays.asList(targets));
        LinkedList<String> users;
        String response = "On,Target,Nickname\n";
        if(args.length < 2) {
            users = new LinkedList<String>(allUsers);
        } else {
            users = new LinkedList<String>();
            for (int i = 1; i < args.length; i++) {
                users.add(args);
for(String username : users) {
if(username.equals(name)) {
response += "*,";
} else {
response += (allUsers.contains(username) ? "y," : "n,");
response += (t.contains(username) ? "y," : "n,");
response += (username + "\n");
send(response);
return true;
* rename this user, first we attempt to add the new name then we remove
* the old one. Both names will be registered for a short while.
* @param newname the new name for this user
* @return true if the rename was successful
private boolean rename(String newname) {
boolean b = false;
logger.info("rename name="+name+" newname="+newname);
if (name != null && name.equals(newname)) {
b = true;
} else if (null == perUser.putIfAbsent(newname, this)) {
if (name != null) {
perUser.remove(name);
name = newname;
b = true;
return b;
* delete from perUser and close our connection
private void close(boolean disconnect) {
logger.info("closing user "+name);
perUser.remove(name);
if (disconnect) {
conn.disconnect();
//====================== Connection.java ===============================//
package pkwnet.msgswitch;
import java.util.HashSet;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.logging.Logger;
import java.util.logging.Level;
public abstract class Connection {
public enum State {CLOSED, OPENING, OPENED, CLOSING}
private HashSet<ConnectionListener> listeners = new HashSet<ConnectionListener>();
private State state = State.CLOSED;
private String host = "127.0.0.1";
private int port = 6060;
private String name = "unconnected";
public Connection() {
public abstract void listen(int port);
public abstract void connect(String address);
public abstract void disconnect();
public abstract void send(String message);
public void addConnectionListener(ConnectionListener listener) {
listeners.add(listener);
public void removeConnectionListener(ConnectionListener listener) {
listeners.remove(listener);
protected void fireDataAvailable(String data) {
for (ConnectionListener listener : listeners) {
listener.dataAvailable(new ConnectionEvent(this, state, data));
private void fireStateChanged() {
for (ConnectionListener listener : listeners) {
listener.stateChanged(new ConnectionEvent(this, state));
protected void fireSendAllowed() {
for (ConnectionListener listener : listeners) {
listener.sendAllowed(new ConnectionEvent(this, state));
protected void fireAccept(Connection conn) {
for (ConnectionListener listener : listeners) {
listener.accept(new ConnectionEvent(this, conn));
protected void setState(State state) {
if (this.state != state) {
this.state = state;
fireStateChanged();
public State getState() {
return state;
protected void setAddress(String address) {
          int n = address.indexOf(':');
          String pt = null;
setName(address);
if(n == 0) {
               host = "127.0.0.1";
               pt = address.substring(1);
          else if(n < 0) {
               host = address;
               port = 5050;
          } else {
host = address.substring(0,n);
               pt = address.substring(n+1);
if (pt != null) {
try {
port = Integer.parseInt(pt);
} catch (NumberFormatException e) {
port = -1;
public String getName() {
return name;
public void setName(String value) {
name = value;
public String getAddress() {
return host + ":" + port;
public String getHost() {
return host;
public void setPort(int value) {
port = value;
public int getPort() {
return port;
//=================== ConnectionEvent.java ================================//
package pkwnet.msgswitch;
public class ConnectionEvent extends java.util.EventObject {
private final String data;
private final Connection.State state;
private final Connection conn;
public ConnectionEvent(Object source, Connection.State state, String data, Connection conn) {
super(source);
this.state = state;
this.data = data;
this.conn = conn;
public ConnectionEvent(Object source, Connection.State state, String data) {
this(source, state, data, null);
public ConnectionEvent(Object source, Connection.State state) {
this(source, state, null, null);
public ConnectionEvent(Object source, Connection conn) {
this(source, conn.getState(), null, conn);
public Connection.State getState() {
return state;
public String getData() {
return data;
public Connection getConnection() {
return conn;
//============================ ConnectionListener.java ===================//
package pkwnet.msgswitch;
public interface ConnectionListener extends java.util.EventListener {
public void stateChanged(ConnectionEvent event);
public void dataAvailable(ConnectionEvent event);
public void sendAllowed(ConnectionEvent event);
public void accept(ConnectionEvent event);
//============================ StreamConnection.java ===================//
package pkwnet.msgswitch;
import java.net.Socket;
import java.net.ServerSocket;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.IOException;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.logging.Logger;
import java.util.logging.Level;
* provides stream socket i/o of character strings
* @author PKWooster
* @version 1.0 September 1, 2005
public class StreamConnection extends Connection {
private Socket sock;
private BufferedReader in;
private BufferedWriter out;
private Thread recvThread = null;
private Thread sendThread = null;
protected LinkedBlockingQueue<String> sendQ;
Logger logger;
public StreamConnection() {
super();
logger = Logger.getLogger("msgswitch.stream");
sendQ = new LinkedBlockingQueue<String>();
* open a socket and start i/o threads
public void connect(String ipAddress) {
setAddress(ipAddress);
try {
sock = new Socket(getHost(), getPort());
connect(sock);
} catch (IOException e) {
logger.log(Level.SEVERE, "Connection failed to=" + ipAddress, e);
private void connect(Socket sock) {
this.sock = sock;
String ipAddress = getAddress();
try {
in = new BufferedReader(new InputStreamReader(sock.getInputStream()));
out = new BufferedWriter(new OutputStreamWriter(sock.getOutputStream()));
recvThread = new Thread(new Runnable() {
public void run() {
doRecv();
},"Recv." + getName());
sendThread = new Thread(new Runnable() {
public void run() {
doSend();
},"Send."+getName());
sendThread.start();
recvThread.start();
setState(State.OPENED);
} catch(IOException e) {
logger.log(Level.SEVERE, "Connection failed to="+ipAddress, e);
public void listen(int port) {
StreamConnection sconn;
setPort(port);
try {
ServerSocket ss = new ServerSocket(port);
while(true) {
Socket us = ss.accept();
sconn = new StreamConnection();
String ipAddress = us.getInetAddress() + ":" + us.getPort();
sconn.setAddress(ipAddress);
sconn.connect(us);
fireAccept(sconn);
} catch(Exception e) {
logger.log(Level.SEVERE, "listen failed", e);
* close the socket connection
public void disconnect() {
logger.fine("disconnect sock=" + sock + " state="+ getState());
if(getState() == State.OPENED) {
setState(State.CLOSING);
try {
sock.shutdownOutput();
} catch(IOException ie) {
logger.log(Level.SEVERE, "showdown failed", ie);
} else if(getState() != State.CLOSED) {
try {
sock.close();
} catch(Exception e) {
logger.log(Level.SEVERE, "close failed", e);
if (sendThread.isAlive()) {
sendThread.interrupt();
sendQ.clear();
setState(State.CLOSED);
public void send(String message) {
if (getState() == State.OPENED) {
try {
sendQ.put(message);
} catch(InterruptedException e) {
logger.log(Level.SEVERE, "sendQ put interrupted", e);
setState(State.CLOSING);
disconnect();
* sets the public name of this connection
public void setName(String name) {
super.setName(name);
if (sendThread != null) {
try {
recvThread.setName("recv." + name);
sendThread.setName("send." + name);
} catch(Exception e) {
logger.log(Level.SEVERE, "nameing threads failed", e);
* the main loop for the send thread
private void doSend() {
String msg;
boolean running = true;
while (running) {
if (sendQ.size() == 0) {
fireSendAllowed();
try {
msg = sendQ.take();
out.write(msg);
out.flush();
} catch(Exception e) {
if (getState() == State.OPENED) {
logger.log(Level.SEVERE, "write failed", e);
setState(State.CLOSING);
disconnect();
running = false;
* the main loop for the receive thread
private void doRecv() {
String inbuf;
while (getState() == State.OPENED) {
try {
inbuf = in.readLine();
} catch(Exception e) {
if (getState() == State.OPENED) {
logger.log(Level.SEVERE, "readline failed", e);
inbuf = null;
if(inbuf == null) {
logger.fine("null received on: " + getAdd

Here are three of them:
NIO server
NIO client
Multithreaded server
The stream based client example seems to have been deleted, probably lost in the troll wars. I also posted a new Simple multithreaded server that uses the same protocol. As the client is missing, I'll repost it.

How can I change java.policy at runtim on client machines using java webst?

Hi,
I have to change java.policy to launch my application through webstart to provide one RuntimePermission "permission java.lang.RuntimePermission "getClassLoader";"
Its because of a bug in java bug "_http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4809366_"
So, my problem here is, how can I do this dynamically on each client machine's java.policy.
I have spent time on this and found some alternatives
1. Specifying an Additional Policy File at Runtime by launching application "java -Djava.security.manager -Djava.security.policy=someURL SomeApp"
Please refer more on this "http://docs.oracle.com/javase/6/docs/technotes/guides/security/PolicyFiles.html"
But, here the problem is, how can I do this using webstart (expert.jnlp) file even though I have the "java-vm-args" tag, its not supporting this argument.
Please refer "http://docs.oracle.com/javase/6/docs/technotes/guides/javaws/developersguide/syntax.html#security";
2. Implementing the Policy in code.
But, not sure how to do this..
How can I grant the runtime permission on every user's machine dynamycally?
Here are some background details on this:
I am using java6 and weblogic 10.3.3.
Here is thing that I tried,
My application downloads a few jars to the client machines using java webstart and then it will get the initial context using the t3 protocal. The jars include wlclient.jar and ojdbc6.jar initially.
The problem here I was facing, when I tried request a bean, it is giving me the following exception in the client logs.It is requesting one state less session bean and I checked the server logs as well and the bean has returned the expected values properly.
But here I observed one more thing, before this request, one session bean(state less) has been requested successfully.
java.rmi.MarshalException: CORBA MARSHAL 0 No; nested exception is:
org.omg.CORBA.MARSHAL: vmcid: 0x0 minor code: 0 completed: No
at com.sun.corba.se.impl.javax.rmi.CORBA.Util.mapSystemException(Unknown Source)
at javax.rmi.CORBA.Util.mapSystemException(Unknown Source)
at com.mbt.expert.server.util._ServerDBQueryObjectRemote_Stub.getExchangeList(Unknown Source)
at com.mbt.expert.util.DBQueryObject.getExchangeList(DBQueryObject.java:419)
at com.mbt.expert.view.dialogs.OpenExchangeDialog.actionPerformed(OpenExchangeDialog.java:425)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.Dialog$1.run(Unknown Source)
at java.awt.Dialog$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Dialog.show(Unknown Source)
at com.mbt.expert.view.dialogs.OpenExchangeDialog.displayDialog(OpenExchangeDialog.java:606)
at com.mbt.expert.mdi.actions.OpenExchangeAction.execute(OpenExchangeAction.java:204)
at com.mbt.mdi.MDICommand.actionPerformed(MDICommand.java:47)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: org.omg.CORBA.MARSHAL: vmcid: 0x0 minor code: 0 completed: No
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at com.sun.corba.se.impl.protocol.giopmsgheaders.MessageBase.getSystemException(Unknown Source)
at com.sun.corba.se.impl.protocol.giopmsgheaders.ReplyMessage_1_2.getSystemException(Unknown Source)
at com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.getSystemExceptionReply(Unknown Source)
at com.sun.corba.se.impl.protocol.CorbaClientRequestDispatcherImpl.processResponse(Unknown Source)
at com.sun.corba.se.impl.protocol.CorbaClientRequestDispatcherImpl.marshalingComplete(Unknown Source)
at com.sun.corba.se.impl.protocol.CorbaClientDelegateImpl.invoke(Unknown Source)
at org.omg.CORBA.portable.ObjectImpl._invoke(Unknown Source)
... 80 more
The same is working in some other machine which are in different network. So, I have replaced the wlclient.jar with the wlthint3client.jar.
After replacing this jar I was getting the below exception in client logs while requesting a state less session bean.I also checked whether the request is reaching the server (bean) or not, but its not reaching the server.The problem is same at all the machines irrespective of the networks.
java.lang.AssertionError: Failed to generate class for com.mbt.expert.server.session.LoginSessionBean_tqw6yu_HomeImpl_1033_WLStub
at weblogic.rmi.internal.StubGenerator.generateStub(StubGenerator.java:797)
at weblogic.rmi.internal.StubGenerator.generateStub(StubGenerator.java:786)
at weblogic.rmi.extensions.StubFactory.getStub(StubFactory.java:74)
at weblogic.rmi.internal.StubInfo.resolveObject(StubInfo.java:213)
at weblogic.rmi.internal.StubInfo.readResolve(StubInfo.java:207)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at java.io.ObjectStreamClass.invokeReadResolve(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at weblogic.utils.io.ChunkedObjectInputStream.readObject(ChunkedObjectInputStream.java:197)
at weblogic.rjvm.MsgAbbrevInputStream.readObject(MsgAbbrevInputStream.java:598)
at weblogic.utils.io.ChunkedObjectInputStream.readObject(ChunkedObjectInputStream.java:193)
at weblogic.rmi.internal.ObjectIO.readObject(ObjectIO.java:62)
at weblogic.rjvm.ResponseImpl.unmarshalReturn(ResponseImpl.java:240)
at weblogic.rmi.cluster.ClusterableRemoteRef.invoke(ClusterableRemoteRef.java:348)
at weblogic.rmi.cluster.ClusterableRemoteRef.invoke(ClusterableRemoteRef.java:259)
at weblogic.jndi.internal.ServerNamingNode_1033_WLStub.lookup(Unknown Source)
at weblogic.jndi.internal.WLContextImpl.lookup(WLContextImpl.java:405)
at weblogic.jndi.internal.WLContextImpl.lookup(WLContextImpl.java:393)
at javax.naming.InitialContext.lookup(Unknown Source)
at com.mbt.expert.mdi.ExpertVariable.getLoginSession(ExpertVariable.java:455)
at com.mbt.expert.view.dialogs.Login.okPressed(Login.java:187)
at com.mbt.expert.view.dialogs.Login.keyPressed(Login.java:141)
at java.awt.Component.processKeyEvent(Unknown Source)
at javax.swing.JComponent.processKeyEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.Dialog$1.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at weblogic.rmi.internal.StubGenerator.generateStub(StubGenerator.java:795)
... 55 more
Caused by: java.security.AccessControlException: access denied (java.lang.RuntimePermission getClassLoader)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.ClassLoader.getSystemClassLoader(Unknown Source)
at weblogic.utils.classloaders.AugmentableClassLoaderManager.getAugmentableClassLoader(AugmentableClassLoaderManager.java:48)
at weblogic.rmi.internal.ClientRuntimeDescriptor.findLoader(ClientRuntimeDescriptor.java:254)
at weblogic.rmi.internal.ClientRuntimeDescriptor.getInterfaces(ClientRuntimeDescriptor.java:132)
at weblogic.rmi.internal.StubInfo.getInterfaces(StubInfo.java:77)
at com.mbt.expert.server.session.LoginSessionBean_tqw6yu_HomeImpl_1033_WLStub.ensureInitialized(Unknown Source)
at com.mbt.expert.server.session.LoginSessionBean_tqw6yu_HomeImpl_1033_WLStub.<init>(Unknown Source)
... 60 more
I have tried one more thing, I have taken all the required jars to one of the client machines and executed the main class (by setting the required class path) from cmd using java instead of javaws. Surprisingly, its working fine with out any problem using the wlthint3client.jar.
I also tried the same, by placing wlclient.jar using java in the same way(from cmd instead of javaws ), but I was facing the same exception while requesting the second session bean and found the same above exception in client logs.
To resolve this, I come across the java bug that I have given earlier "_http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4809366_".
In that page, I found a work around for this; suggested by bea to add the Runtime permission "permission java.lang.RuntimePermission "getClassLoader";" to the clients java.policy
So, please suggest me a way to resolve this problem.
Please suggest me if you have any other solutions for this problem.
Thanks in advance :)

I still think your problem is nothing to do with that ancient non-bug and that you should be looking elsewhere. You might be lucky and find someone here who can say "Ah, I know what that is" but I doubt it because since Oracle took over Sun this site has gone down hill big time.

Error when trying to use the Log Viewer

Hello experts, today I wanted to examine some logs using the Log Viewer on Visual Administrator. However, when clicking on this service, the Visual Administrator would freeze for a long while and after that, an error message was displayed. I do not remember the exact message, but it was something like "A fatal error occurred. For more information, click on the Details button". After clicking on that button, the following error was displayed:
com.sapmarkets.bam.util.BAMRuntimeException
at com.sapmarkets.bam.jmx.connector.rmi.AbstractConnectorClient.invoke(AbstractConnectorClient.java:110)
at $Proxy31.getAttribute(Unknown Source)
at com.sapmarkets.bam.application.logdepot.AbstractLogDepot.getAttribute(AbstractLogDepot.java:236)
at com.sapmarkets.bam.application.logdepot.AbstractLogDepot.getLogDescriptors(AbstractLogDepot.java:84)
at com.sapmarkets.bam.view.config.RemoteViewConfiguration.initializeViewConfiguration(RemoteViewConfiguration.java:65)
at com.sapmarkets.bam.view.overview.OverviewFacade.populateOverview(OverviewFacade.java:219)
at com.sapmarkets.bam.view.AbstractLogViewerAppplication.populateOverview(AbstractLogViewerAppplication.java:171)
at com.sapmarkets.bam.view.AbstractLogViewerAppplication.initOverview(AbstractLogViewerAppplication.java:652)
at com.sapmarkets.bam.j2ee.services.logviewer.gui.LogViewerRuntimeLogical.setRuntime(LogViewerRuntimeLogical.java:121)
at com.sapmarkets.bam.j2ee.services.logviewer.gui.LogViewerRuntimeLogical.show(LogViewerRuntimeLogical.java:88)
at com.sap.engine.services.adminadapter.gui.node.ServiceNodeView.selectSingleService(ServiceNodeView.java:202)
at com.sap.engine.services.adminadapter.gui.node.ServiceNodeView.selectNode(ServiceNodeView.java:156)
at com.sap.engine.services.adminadapter.gui.AdminManager.selectServiceNode(AdminManager.java:290)
at com.sap.engine.services.adminadapter.gui.AdminManager.selectNode(AdminManager.java:170)
at com.sap.engine.services.adminadapter.gui.AdminManager.valueChanged(AdminManager.java:108)
at javax.swing.JTree.fireValueChanged(JTree.java:2392)
at javax.swing.JTree$TreeSelectionRedirector.valueChanged(JTree.java:2763)
at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(DefaultTreeSelectionModel.java:629)
at javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange(DefaultTreeSelectionModel.java:1076)
at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPaths(DefaultTreeSelectionModel.java:287)
at javax.swing.JTree.setSelectionInterval(JTree.java:2041)
at javax.swing.plaf.basic.BasicTreeUI$TreeIncrementAction.actionPerformed(BasicTreeUI.java:3268)
at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1530)
at javax.swing.JComponent.processKeyBinding(JComponent.java:2438)
at javax.swing.JComponent.processKeyBindings(JComponent.java:2473)
at javax.swing.JComponent.processKeyEvent(JComponent.java:2401)
at java.awt.Component.processEvent(Component.java:4978)
at java.awt.Container.processEvent(Container.java:1569)
at java.awt.Component.dispatchEventImpl(Component.java:3684)
at java.awt.Container.dispatchEventImpl(Container.java:1627)
at java.awt.Component.dispatchEvent(Component.java:3546)
at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1713)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:627)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:831)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:741)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:592)
at java.awt.Component.dispatchEventImpl(Component.java:3575)
at java.awt.Container.dispatchEventImpl(Container.java:1627)
at java.awt.Window.dispatchEventImpl(Window.java:1606)
at java.awt.Component.dispatchEvent(Component.java:3546)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:480)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)
Caused by: java.lang.reflect.InvocationTargetException
at com.sapmarkets.bam.util.FutureResult.get(FutureResult.java:71)
at com.sapmarkets.bam.jmx.connector.rmi.AbstractConnectorClient.invoke(AbstractConnectorClient.java:104)
... 45 more
Caused by: java.lang.OutOfMemoryError: Java heap space
at javax.management.ObjectName.construct(ObjectName.java:385)
at javax.management.ObjectName.readObject(ObjectName.java:1063)
at sun.reflect.GeneratedMethodAccessor60.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:838)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1736)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:322)
at java.util.ArrayList.readObject(ArrayList.java:559)
at sun.reflect.GeneratedMethodAccessor63.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:838)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1736)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:322)
at java.util.HashMap.readObject(HashMap.java:1015)
at sun.reflect.GeneratedMethodAccessor64.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:838)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1736)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1835)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1759)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:322)
The lines I marked in bold are the ones that caught my attention. What is this error and how can I fix it?

Hello, thanks for your answers. I checked the JVM Heap size, we are using a 64 bit HW, and it was already set to 2048M, as well as both parameters Xms and Xmx. I also checked our virtual memory and directory space, the virtual memory looks fine, and the <SID> directory uses 5 GB of space.
If you wish, I can write the configuration found on the Config Tool, where you set the JVM Heap size and other parameters.

Use Java Logging mechanism

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