Question about Java Applet Jar file signing.

These questions pertain to Java 6 Standard Edition 1.6.0_22-b04 and later.
I have gone through the Oracle Java Tutorial for generate public and private key information
to sign a jar file, and how to sign the jar itself, all at
[http://java.sun.com/developer/onlineTraining/Programming/JDCBook/signed.html|http://java.sun.com/developer/onlineTraining/Programming/JDCBook/signed.html]
, and seek some clarification on the following related questions:
-In order to "escape" the java applet sandbox that exists around the client's
copy of the applet running in their web browser, ie.
(something forbidden by default), is verification of the signed applet enough, or is a policy file required
to stipulate these details?
-using the policytool policy file generator, what do I need to add under "Principals"
(if anything) when dealing with a Java applet? Are Codebase and SignedBy simply author information?
-If I choose to use a java.security.Permission subclass object set up in equivalent fashion within the Applet,
which class within the Applet jar do I instantiate that object in? Does it need to be mentioned
in the applet's jar Manifest.MF file?
-Is the "keystore database" a java language service/process which runs in
the Server's memory and is simply accessed and started by default
by the client verifier program (appletview/web browser)?
-The public key certificate file (*.cer) is put in the webserver directory holding
the Applet jar file (ie. Apache Tomcat, for example).
-Presumably, the web browser detects the signed jar
and certificate file, and provides the browser pop up menu asking the user
about a new, non recognised certificate (initially).
Is this so?
-With this being the case, can the applet now escape
the sandbox, be it with or without the stipulated
policy permissions?

848439 wrote:
-In order to "escape" the java applet sandbox that exists around the client's
copy of the applet running in their web browser, ie.
(something forbidden by default), is verification of the signed applet enough, or is a policy file required
to stipulate these details?Just sign the applet, the policy file is not necessary.
-Is the "keystore database" a java language service/process which runs in
the Server's memory and is simply accessed and started by default
by the client verifier program (appletview/web browser)?No.
-The public key certificate file (*.cer) is put in the webserver directory holding
the Applet jar file (ie. Apache Tomcat, for example).No. For a signed Jar, all the information is contained inside the Jar.
-Presumably, the web browser detects the signed jar
and certificate file, and provides the browser pop up menu asking the user
about a new, non recognised certificate (initially).
Is this so?No. It is the JVM that determines when to pop the confirmation dialog.
-With this being the case, can the applet now escape
the sandbox, ..Assuming the end-user OK's the trust prompt, yes.
..be it with or without the stipulated
policy permissions?Huh?

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Hi Naichen,
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Regards,
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"Naichen Liu" <[email protected]> wrote:
>
>
>
Hi,
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C:\DOCUME~1\u252738\LOCALS~1\Temp\wlwproxy37508.jar1533409921\com\ual\www\rcc\cb
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Hello everyone,
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Loading classes...
Loading: pkg1.Class1
Connecting http://my.server.com/my_dir/pkg1/Class1.class with no proxy
Connecting http://my.server.com/my_dir/pkg1/Class1.class with cookie "JSESSIONID=some_big_long_char_list"
Can't find class: pkg1.Class1
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public void start() {
// ...initialize gui...
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I have been combing the FAQ's without finding any other refrences to the problem.

I haven't found a solution to the original problem but for someone else that is looking for a workaround for this. I found that if I use two JAR with my Cipher in the second one, I can still load class files out of the first. I.E. <PARAM NAME = java_archive VALUE = "supportClasses.jar,mainApplet.jar"> where mainApplet.jar contains the code that uses the Cipher.

Multiple repeat downloads of applet jar file

We have an applet that is downloaded from a Weblogic server. The applet is packaged as a jar file. Some of the testers have been complaining that the applet is extremely slow to start up.
The applet start-up involves three phases. In a first phase, it fetches data from the server. This phase seems to execute in pretty much constant time. During the second and third phases, it constructs a UI using Swing objects. The UI includes some JPEG files, which are extracted from the applet's own jar file.
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Has anyone seen anything similar and, more to the point, is there a fix or workaround?
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Thanks in advance for any help.

Ok.
I have been trying hard and found the solution. One of the ablove posting says that it works under java 1.4.1 plug-in. That's infact absolutely true. It also says that how to run client using JRE 1.4.2 or higher. That can be solved two. This is definitely a bug with the 1.4.2 plug-in.
Follow this procedure that will solve the mystry.
----------------------start ---------------------------------
Problem
Download of applet is very slow
Why?
This was happening because of the repeated download of the applet jars by the applet plug in controller. It is quite clear that the Java 1.4.2 plug in controller has a bug that causes the plug in to download same jar files multiple times irrespective of Jar cache in the client side (configurable from client side using the Java plug in control panel) is enabled or disabled. Therefore, we have moved from 1.4.2 plug in to 1.4.1 (controlled from our client (JSP) code) that works fine.
What the client (applet client) should do?
You must do the following in the client side in order to avoid the long download time for applet when running from a browser. We have also found that the browser actually do not matter in slow applet downloads. It is only the plug in that does control the applet download.
Irrespective of what JVM you have already installed (or not yet installed) please do the following:
1. Download the JRE 1.4.2 from http://java.sun.com/products/archive/index.html
-At the time of its installation if it shows that the "JRE is already installed do you uninstall it?" Go ahead and uninstall the JRE 1.4.2. After the un-installation again install the JRE 1.4.2
-If it does not have the JRE 1.4.2 already installed, then you will see any warning window and you will be able to install the 1.4.2 JRE successfully.
2. Now, go to the same link and install JRE 1.4.1.
-If this JRE already installed, uninstall first like the step 1 above. then reinstall it.
3. Now, after successful installation of the JRE 1.4.1, open the Plug-In control panel.
-You will find the list of control panel(s) in the Start->Control Panel window. Use the control panel that shows the version number 1.4.1. If no version number shown then use the one that do not show any version number at its end.
4. Do the following on the Plug-In control panel.
-Verify if this is the 1.4.1 plug in control panel? Go to the "About" tab to see if it shows 1.4.1.
If it does not show the 1.4.1 (or 1.4.1_x) then plug in was not installed correctly. Reinstall the 1.4.1 JRE following the step in no-2
-Go to "Basic" tab and select "Show console" radio button.
-Go to "Advanced" tab and from the drop down select "JRE ...1.4.2" from the "Java Runtime Environment" drop down box.
-Go to "Browser" tab and select all that in the "Settings" box applicable for browsers.
-Go to "Cache" select "Enable Caching" if it is not selected currently. Select "Unlimited" from "Size" options.
Now hit "Apply" button at the bottom and close the control panel using the 'X'.
5. Restart your Windows machine.
6. You are ready to run the applet from any of the browser (IE, NS, etc.)
--------------------------end------------------------------

JAR File Signing : NoClassDefFoundError

Hi,
I have followed the new white paper, JAR file signing for JInit 1.3, and have used workround 2 to Register My Custom Sigingn Certificate Seperately.
All appears to ge well, i.e. the dialog is shown, and when granted, the cerificate is listed within the JINIT 1.3 console.
Howver, when I attempt to access Java code attempting to break out of the sandbox (executing a Host command), I receive a Java Exception :
Exception occurred during event dispatching:
java.lang.NoClassDefFoundError: oracle/forms/ui/VBean
 at java.lang.ClassLoader.defineClass0(Native Method)
 at java.lang.ClassLoader.defineClass(Unknown Source)
 at java.security.SecureClassLoader.defineClass(Unknown Source)
 at java.net.URLClassLoader.defineClass(Unknown Source)
 at java.net.URLClassLoader.access$100(Unknown Source)
 at java.net.URLClassLoader$1.run(Unknown Source)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.net.URLClassLoader.findClass(Unknown Source)
 at java.lang.ClassLoader.loadClass(Unknown Source)
 at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
 at java.lang.ClassLoader.loadClass(Unknown Source)
 at sun.applet.AppletClassLoader.loadClass(Unknown Source)
 at java.lang.ClassLoader.loadClass(Unknown Source)
 at java.lang.ClassLoader.loadClassInternal(Unknown Source)
 at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
 at oracle.forms.handler.UICommon.instantiate(Unknown Source)
 at oracle.forms.handler.UICommon.onCreate(Unknown Source)
 at oracle.forms.handler.JavaContainer.onCreate(Unknown Source)
 at oracle.forms.engine.Runform.onCreateHandler(Unknown Source)
 at oracle.forms.engine.Runform.processMessage(Unknown Source)
 at oracle.forms.engine.Runform.processSet(Unknown Source)
 at oracle.forms.engine.Runform.onMessageReal(Unknown Source)
 at oracle.forms.engine.Runform.onMessage(Unknown Source)
 at oracle.forms.engine.Runform.processEventEnd(Unknown Source)
 at oracle.ewt.lwAWT.LWComponent.redispatchEvent(Unknown Source)
 at oracle.ewt.lwAWT.LWComponent.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.dispatchEvent(Unknown Source)
 at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
 at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
 at java.awt.EventDispatchThread.run(Unknown Source)
The oracle/forms/VBean.class is included within the JAR cache, as downloaded within f60all_jinit.jar (also used f60jinit.jar). These are as delivered within Patchset 11.
We are using Forms 6i and JInit 1.3.1.9.
Please note that the Java code works when using JInit 1.1.8.19 (after manually updating identity.obj with the signing identity).
Any assistance, would be much appreciated.
Regards
Marc Ludwig

Hi Duncan,
I have cleared out the cache, tried re-installing etc. but continue to get the exception.
Apologies for the length, but I attach the "hostcommand" Java code.
// Copyright (c) 2002 Aquila Group Holdings Ltd
package uk.co.aquilauk;
import java.util.*;
import java.text.*;
import java.io.*;
import oracle.forms.ui.*;
import oracle.forms.properties.*;
import oracle.forms.handler.*;
* <code>HostCommand</code> is an Oracle Forms Pluggable Java Component that provides access to the client
* machine allowing administrator web forms to run executables
* The class will need to be signed before being used since access to the client machine
* is an activity that is defined outside of the default Java sandbox.
* 
* <DL><DT>Revision Information:</DL>
* <pre>
* Nick Holcombe 30/11/2001 Initial revision.
* Nick Holcombe 04/12/2001 Added JavaDocs comments.
* Marc Ludwig 03/01/2002 Added call to StreamGobbler to handle standard error and input streams.
* </pre>
* 
public class HostCommand extends VBean {
* Stores the handler for this view class
IHandler mHandler = null;
// Return codes from host command
static final int RC_CMDNOTRUN = -1;
static final int RC_CMDERROR = -2;
static final int RC_CMDNOTFINISHED = -3;
* Register custom properties, used to invoke the setProperty/getProperty JavaBean methods
static final ID P_MODAL = ID.registerProperty("MODAL");
static final ID P_RETURNCODE = ID.registerProperty("RETURNCODE");
static final ID P_NEWCOMMAND = ID.registerProperty("newCommand");
static final ID P_ADDCOMMAND = ID.registerProperty("addCommand");
static final ID P_RUNCOMMAND = ID.registerProperty("runCommand");
private boolean modal = false;
private int returnCode = RC_CMDNOTRUN;
private Vector cmdArray = new Vector();
private Process commandProcess = null;
private boolean commandHasRun = false;
private boolean isCommandStillRunning () {
if (commandHasRun)
return false;
try {
int ev = commandProcess.exitValue();
commandHasRun = true;
returnCode = ev;
catch (java.lang.IllegalThreadStateException e) {
return true;
return false;
private String getReturnCode () {
if (isCommandStillRunning()) {
return ""+RC_CMDNOTFINISHED;
else if (commandHasRun) {
return ""+returnCode;
else {
return ""+RC_CMDNOTRUN;
private String getModal () {
if (modal)
return "TRUE";
else
return "FALSE";
private boolean setModal (Object value) {
String newModal = (String) value;
if (newModal.equals ("TRUE"))
modal = true;
else
modal = false;
return true;
private String newCommandArray () {
cmdArray = new Vector();
return "";
private boolean addCommandArray (Object value) {
String cmdEntry = (String) value;
if (cmdArray == null) {
cmdArray = new Vector();
System.err.println ("HostCommand.addCommandArray: Adding command "+cmdEntry);
cmdArray.addElement (cmdEntry);
return true;
private String runCommandArray () {
execCommandArray();
return (getReturnCode());
private boolean execCommandArray () {
returnCode = RC_CMDNOTRUN;
commandHasRun = false;
commandProcess = null;
String cmd[] = new String[cmdArray.size()];
int count = 0;
try {
if (cmdArray != null && cmdArray.size() > 0) {
for (Enumeration e = cmdArray.elements() ; e.hasMoreElements() ;) {
String cmdElement = (String) e.nextElement();
cmd[count++] = cmdElement;
commandProcess = Runtime.getRuntime().exec(cmd);
StreamGobbler errorGobbler = new StreamGobbler(commandProcess.getErrorStream(), "ErrStream");
StreamGobbler outputGobbler = new StreamGobbler(commandProcess.getInputStream(), "OutStream");
errorGobbler.start();
outputGobbler.start();
if (modal) {
returnCode = commandProcess.waitFor();
commandHasRun = true;
catch (Exception x) {
x.printStackTrace();
returnCode = RC_CMDERROR;
commandHasRun = true;
return false;
return true;
* Method in the IView interface that is called when the component is first
* initialised from by the Forms Server.
* @param a reference to the Handler object for this class
public void init(IHandler handler)
mHandler = handler;
commandProcess = null;
returnCode = RC_CMDNOTRUN;
commandHasRun = false;
cmdArray = new Vector();
* Method in the IView interface that is called when the Forms Server wishes to
* obtain the value of a specific property from the class.
* For the 6i release, the get_custom_property method will be available which will
* allow for a far simple usage model. The Form developer will simply be able to call
* get_custom_property('HOSTCOMMAND') and we will return the host command as a string.
* @param pid the property to be returned
* @return the value of the property that was requested
public Object getProperty(ID pid)
if (pid == P_MODAL) {
return (getModal ());
else if (pid == P_RETURNCODE) {
return (getReturnCode ());
else if (pid == P_NEWCOMMAND) {
return (newCommandArray());
else if (pid == P_RUNCOMMAND) {
return (runCommandArray());
else // let the VBean superclass handle the other properties
return(super.getProperty(pid));
public boolean setProperty (ID pid, Object value) {
boolean result = true;
if (pid == P_MODAL) {
result = setModal (value);
else if (pid == P_ADDCOMMAND) {
result = addCommandArray (value);
else
result = super.setProperty (pid, value);
return result;
* A convenience function to use the new ID.getName() method exposed in the 6i
* release but which will still allow the PJC to be used in the 6.0 release
* @param pid the property to display the name of
* @return the property name
public String getPropertyName(ID pid)
try
return pid.getName();
// if there is an exception, it's 6.0 running!
catch(Exception e)
return null;
* The test method which allows class to be run from the command line to determine
* if it is functioning correctly.
* @param args[] the command line arguments
public static void main(String args[])
String commandToRun = "";
if (args.length == 0) {
System.err.println("usage: hostcommand Command to run");
System.exit(1);
HostCommand hc = new HostCommand();
hc.getProperty (P_NEWCOMMAND);
if (args.length > 0) {
for (int i = 0; i<args.length; i++) {
commandToRun += args[i]+" ";
hc.setProperty (P_ADDCOMMAND, args);
System.out.println("CommandtoRun: >"+commandToRun+"<");
hc.setProperty (P_MODAL, "TRUE"); // Make the test example modal
String rc = (String) hc.getProperty (P_RUNCOMMAND); // Run the command, getting the return code
System.err.println("rc="+rc); // Display the return code
// Regardless of the modal property, wait until the command has finished before the return code
// is retrieved, otherwise a -3 will be returned if the process is still running.
if (hc.getReturnCode().equals(""+RC_CMDNOTFINISHED)) {
System.err.println ("CommandNotFinished. Waiting for command to finish to get the return code");
while (hc.getReturnCode().equals(""+RC_CMDNOTFINISHED)) {
System.err.println("ReturnCode: "+hc.getProperty (P_RETURNCODE)); // Display the return code
System.exit(0);
// Copyright (c) 2002 Aquila Group Holdings Ltd
package uk.co.aquilauk;
import java.util.*;
import java.io.*;
* <code>StreamGobbler</code> is a public class that is currently called from the HostCommand class, to control output
* and error streams produced when calling Host commands from the JVM.
* 
* <DL><DT>Revison Information:</DL>
* <pre>
* Marc Ludwig 03/01/2002 Initial revision.
* </pre>
* 
public class StreamGobbler extends Thread {
InputStream is;
String type;
StreamGobbler(InputStream is, String type) {
this.is = is;
this.type = type;
public void run() {
try {
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line=null;
while ( (line = br.readLine()) != null)
System.err.println(type + ": " + line);
catch (IOException ioe) {
ioe.printStackTrace();
Hope you are able to help. As mentioned previously, this same code works successfully when using JINIT 1.1.8.19 after manually updating the JInit identity.obj with our sigining identity.
Regards
Marc Ludwig

Got error when trying to generate Java proxy jar file for webservice

Hi,
I am having a warning message when trying to generate java proxy jar file on weblogic8.1
webservice test web app, the message is as follows:
"Warning Failed to generate client proxy from WSDL definition for this service.
Prescription Please verify the <types> section of the WSDL."
in the mean time, on weblogic starting terminal, I saw the following exceptions,
C:\DOCUME~1\u252738\LOCALS~1\Temp\wlwproxy37508.jar1533409921\com\ual\www\rcc\cb
t\schema\modifypnr\AlphaLength4Deserializer.java:36: cannot resolve symbol
symbol : class FacetUtils
location: package binding
weblogic.xml.schema.binding.FacetUtils.checkLengthFacet(__typed_obj,4L);
^
C:\DOCUME~1\u252738\LOCALS~1\Temp\wlwproxy37508.jar1533409921\com\ual\www\rcc\cb
t\schema\modifypnr\OSIFieldAnonTypeDeserializer.java:36: cannot resolve symbol
symbol : class FacetUtils
location: package binding
weblogic.xml.schema.binding.FacetUtils.checkMaxLengthFacet(__typed_obj,69L);
^
C:\DOCUME~1\u252738\LOCALS~1\Temp\wlwproxy37508.jar1533409921\com\ual\www\rcc\cb
t\schema\modifypnr\AlphaLength2Deserializer.java:36: cannot resolve symbol
symbol : class FacetUtils
location: package binding
weblogic.xml.schema.binding.FacetUtils.checkLengthFacet(__typed_obj,2L);
^
C:\DOCUME~1\u252738\LOCALS~1\Temp\wlwproxy37508.jar1533409921\com\ual\www\rcc\cb
t\schema\modifypnr\FreeFormAnonTypeDeserializer.java:36: cannot resolve symbol
symbol : class FacetUtils"
Can anybody help me about this issue? I attached WSDL file, also United Airlines
got an enterprise weblogic license deal with BEA, any help will be highly appreciated.
Thanks!!!
Naichen
[ModifyPNRWSContract.wsdl]

Hi Naichen,
I was able to successfully run both the autotype and clientgen Ant task, on the
WSDL you provided. The code behind those Ant tasks are pretty much what the WebLogic
Web Services test page run. Are you using WLS 8.1 SP2? If not, you might want
to try with that version.
Regards,
Mike Wooten
"Naichen Liu" <[email protected]> wrote:
>
>
>
Hi,
I am having a warning message when trying to generate java proxy jar
file on weblogic8.1
webservice test web app, the message is as follows:
"Warning Failed to generate client proxy from WSDL definition for this
service.
Prescription Please verify the <types> section of the WSDL."
in the mean time, on weblogic starting terminal, I saw the following
exceptions,
C:\DOCUME~1\u252738\LOCALS~1\Temp\wlwproxy37508.jar1533409921\com\ual\www\rcc\cb
t\schema\modifypnr\AlphaLength4Deserializer.java:36: cannot resolve symbol
symbol : class FacetUtils
location: package binding
weblogic.xml.schema.binding.FacetUtils.checkLengthFacet(__typed_obj,4L);
^
C:\DOCUME~1\u252738\LOCALS~1\Temp\wlwproxy37508.jar1533409921\com\ual\www\rcc\cb
t\schema\modifypnr\OSIFieldAnonTypeDeserializer.java:36: cannot resolve
symbol
symbol : class FacetUtils
location: package binding
weblogic.xml.schema.binding.FacetUtils.checkMaxLengthFacet(__typed_obj,69L);
^
C:\DOCUME~1\u252738\LOCALS~1\Temp\wlwproxy37508.jar1533409921\com\ual\www\rcc\cb
t\schema\modifypnr\AlphaLength2Deserializer.java:36: cannot resolve symbol
symbol : class FacetUtils
location: package binding
weblogic.xml.schema.binding.FacetUtils.checkLengthFacet(__typed_obj,2L);
^
C:\DOCUME~1\u252738\LOCALS~1\Temp\wlwproxy37508.jar1533409921\com\ual\www\rcc\cb
t\schema\modifypnr\FreeFormAnonTypeDeserializer.java:36: cannot resolve
symbol
symbol : class FacetUtils"
Can anybody help me about this issue? I attached WSDL file, also United
Airlines
got an enterprise weblogic license deal with BEA, any help will be highly
appreciated.
Thanks!!!
Naichen

Three questions about Java and Ftp

Hello, i've the following questions about Java and Ftp:
1- .netrc file is in $HOME directory but i can't access to this directory from java code. The following line producesan Exception (directory doesn't exists)
FileWriter file = new FileWriter ("$HOME/.netrc");
2- .netrc file must have the following permissions: -rw- --- --- but when i create the .netrc file the following permissions are on default: -rw- r-- r--, how can i change this permissions? (In java code, i can't use chmod.....)
3- Are there any way to pass parameters to a .netrc file? If i get to do this i needn't change the permissions because i can't modify or create/destroy this file.
Thanks in advanced!!!
Kike

1- .netrc file is in $HOME directory but i can't
access to this directory from java code. The
following line producesan Exception (directory
doesn't exists)
FileWriter file = new FileWriter ("$HOME/.netrc");$HOME would have to be replaced by a shell, I don't
think you can use it as part of a legal path.
Instead, use System.getProperty("user.home");
Ok, thanks
2- .netrc file must have the followingpermissions:
-rw- --- --- but when i create the .netrc file the
following permissions are on default: -rw- r--r--,
how can i change this permissions? (In java code,i
can't use chmod.....)Yes, you can: Runtime.exec("chmod ...");
I need to use estrictly the .netrc with -rw- --- --- permissions
Yes, i can use Runtime.exec ("chmod ..."); but i don't like very much this solution because is a slow solution, am i right?
3- Are there any way to pass parameters to a.netrc
file? If i get to do this i needn't change the
permissions because i can't modify orcreate/destroy
this file.I don't think so. Why do you need the .netrc file in
Java at all? Writing a GUI frontend?I want to use automatic ftp in a java program and FTP server, the files and path are not always the same, so i can:
- modify .netrc (for me is the complex option)
- destroy and create a new .netrc (is easier but i have permissions problem)
- use .netrc with parameters but i haven't found any help about it
Thanks for your prompt reply!!!!
Kike

My Applet Jar file doesn't work !!

hello ,
I have written this java applet :
import java.awt.*;
import javax.swing.*;
import java.applet.Applet;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.URL;
public class test4 extends Applet implements ActionListener{
 private static final long serialVersionUID = 1L;
 private JButton B1 =new JButton("Forward ");
 private JButton B2 =new JButton("Backward");
 private JButton B3 =new JButton("Left");
 private JButton B4 =new JButton("Right");
private JPanel P1 = new JPanel();
private JPanel P2 = new JPanel();
private JPanel P3 = new JPanel();
private JPanel P4 = new JPanel();
private JPanel P5 = new JPanel();
private JPanel P6 = new JPanel();
private JLabel L3 = new JLabel(" ");
private JLabel L4 = new JLabel(" ");
private JLabel L5 = new JLabel(" ");
private JLabel L6 = new JLabel(" ");
private JLabel L7 = new JLabel(" ");
JSplitPane sppSplitPane0 = new JSplitPane( );
 public test4()
 JFrame.setDefaultLookAndFeelDecorated(true);
 sppSplitPane0.setDividerLocation( 250 );
 P3.add(L4);
 P3.add(B1);
 P3.add(L5);
 P5.add(B3);
 P5.add(L3);
 P5.add(B4);
 P4.add(L6);
 P4.add(B2);
P4.add(L7);
 P1.setLayout(new BorderLayout());
 P1.add("North",P3);
 P1.add("Center",P5);
 P1.add("South",P4);
 P2.setLayout(new BorderLayout());
 P2.add("North" , P1);
 B1.addActionListener(this);
 B2.addActionListener(this);
 B3.addActionListener(this);
 B4.addActionListener(this);
 sppSplitPane0.setLeftComponent(P2);
 sppSplitPane0.setRightComponent(P6);
 public void actionPerformed(ActionEvent e) {
 try {
 if (e.getSource() == B4) {
 URL myNewURL = new URL("http://amera/cgi-bin/test.cgi?R");
 System.out.println("URL = " + myNewURL);
 getAppletContext().showDocument(myNewURL,"blank");
 else
 if (e.getSource() == B3) {
 URL myNewURL = new URL("http://amera/cgi-bin/test.cgi?L");
 System.out.println("URL = " + myNewURL);
 getAppletContext().showDocument(myNewURL,"blank");
 else
 if (e.getSource() == B2) {
 URL myNewURL = new URL("http://amera/cgi-bin/test.cgi?B");
 System.out.println("URL = " + myNewURL);
 getAppletContext().showDocument(myNewURL,"blank");
 else {
 URL myNewURL = new URL("http://amera/cgi-bin/test.cgi?F");
 System.out.println("URL = " + myNewURL);
 getAppletContext().showDocument(myNewURL,"blank");
 } catch (Exception err) {
 System.err.println("Error!\n" + err);
 showStatus("Error, look in Java Console for details!");
 public static void main(String[] args) {
 test t=new test();
 JFrame frame =new JFrame();
 frame.add(t.sppSplitPane0);
 frame.setSize(1100,700);
 frame.setVisible(true);
i made a jar file :
i created a file and named it MANIFEST.MF .i wrote inside it :
Main-Class: test
Then i placed it in a folder with the test.class .I created jar file using command line.
I entered the test.class path and then wrote this command :
jar cvfm myjar.jar MANIFEST.MF *.class
Then the jar file "myjar.jar" is created .
it's executed but this function "public void actionPerformed(ActionEvent e) " won't wrok.
i keep pressing the buttons but nothing is happening !!
please help me .
Edited by: Amera on Dec 27, 2009 2:51 PM

Welcome to the Sun forums.
Subject: My Applet Jar file doesn't work !! .
1) Note that one '!' denotes exclamation, whereas 2 or more often denotes a dweeb.
2) Since you are on your first post, I will point out that applets are an advanced topic, and should not be attempted by newbies.
3) "doesn't work" is very vague. It is likely to produce a reply like "maybe the applet is lazy - try flogging it".
Amera wrote:
..I have written this java applet :When posting code, code snippets, HTML/XML or input/output, please use the code tags. The code tags help retain the formatting and indentation of the sample. To use the code tags, select the sample and click the CODE button.
Also note that the most preferred form of code is an SSCCE *(<- link).* In an SSCCE, your would remove all but one button (if the actionPerformed fails with 6 or 7 buttons, trim it down to fail with just one or two.
i made a jar file :So does the applet work before you make the Jar file? Your post so far suggests the Jar file is the problem.
i created a file and named it MANIFEST.MF .i wrote inside it :
Main-Class: test
Then i placed it in a folder with the test.class .I created jar file using command line.
I entered the test.class path and then wrote this command :
jar cvfm myjar.jar MANIFEST.MF *.class
Then the jar file "myjar.jar" is created .
it's executed but this function "public void actionPerformed(ActionEvent e) " won't wrok.
i keep pressing the buttons but nothing is happening !!So you get 'no output in the console & no effect in the applet'?
What is the URL where I can see your applet failing?
As an aside, since Sun does not guarantee that applet clients will act on the showDocument command, even if it does not work, it would not be a 'bug'.
Edited by: AndrewThompson64 on Dec 28, 2009 11:18 AM

I have a question about using adobe CS files in CS6 edition

I am a graphic artist . I have a question about using adobe CS files in CS6 edition. when I am gonna open thse adobe CS created files in CS6 Edition i get a color variation than i made with the CS version.Please give me an idea about this issue as soon as possible.If you need i can upload my problem as a screenshot to clearity

donrulz,
Are your Edit>Color Settings the same?
Are you using spot colours, such as Pantone (there have been some changes in CMYK values with new colour books)?

Custom certificates for JAR file signing

Hi,
Can anyone please let me know how to check that we have custom certificates for JAR file signing set up in our instance
Thanks,
Praveen

It depends on the version of your $ADJVAPRG. See the referenced note.
How to use,create and /or update Digital Certificates for Jinitiator in 11i Applications
http://metalink.oracle.com/metalink/plsql/ml2_documents.showDocument?p_database_id=NOT&p_id=365735.1

Question about Java's HttpServer: Threading? Backlog?

Hello,
I have two questions about Java's HttpServer (com.sun.net.httpserver). From the JavaDoc:
>
Management of threads can be done external to this object by providing a Executor object. If none is provided a default implementation is used.
>
How can I get information about the default implementation in 1.6.0_13? Do you know the behavior? From my observations, the default implementation uses no Threads, meaning every request is handled in the same Thread, this results in handling the requests to the HttpServer one after another.
Is this right?
The second question is about this, also from the JavaDoc:
>
When binding to an address and port number, the application can also specify an integer backlog parameter. This represents the maximum number of incoming TCP connections which the system will queue internally. [...]
>
When setting the backlog to -1, it uses the systems default backlog. How can I determine the systems default backlog? Can some lines of Java code reveal it (there is no getBeacklog() method)? Or is it up to the Operating System (we use Redhat Linux)?
Thanks a lot for your help!
Regards,
Timo

How can I determine the systems default backlog?You can't. There is no API for that even at the C level.
Can some lines of Java code reveal itNo.
Or is it up to the Operating System (we use Redhat Linux)?Yes. Linux provides a large default. It seems to be at least 50 on most platforms. This is not something you should be worrying about.

Question about Java Applet Jar file signing.

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