How to write a class loader to solve the class confliction in rt.jar?

Hello guys:
The weblogic.jar has the javax.management.*, it is conflict with rt.jar's
I want to use JMX 1.0 to communicate with weblogic 8.1. The client should be run in the Java 1.5
It throw
java.io.InvalidClassException: javax.management.ObjectName; local class incompatible:
stream classdesc serialVersionUID = -5467795090068647408, local class serialVersionUID = 1081892073854801359
java.io.InvalidClassException: javax.management.ObjectName; local class incompatible:
stream classdesc serialVersionUID = -5467795090068647408, local class serialVersionUID = 1081892073854801359I know the reason is java 1.5 has JMX 1.2 in it.
So how can I program a class loader to load the weblogic.jar classes in? I have tried a lot of code, but failed.
Is there any sample here?
I want to use the JMX 1.0 in weblogic.jar at jdk1.5 run time
Thanks a lot,
Qiang

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Hi,
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ArulPrabhu wrote:
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How to write into a private fiald from the outer world?

Hello,
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Hi,
Refers the following links.
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/4fd2d690-0201-0010-de83-b4fa0c93e1a9
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/5f27e290-0201-0010-ff82-c21557572da1
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/70c9a954-aa20-2a10-64bb-ea0835204e03
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How to write a Query a table and the return result is the column name

Hi All
Pls advise how to write a query whereas the return result is the
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Edited by: user600866 on Oct 14, 2008 12:13 AM

Data Dictionary table user_tab_columns has all the column names. You can query that and get what ever you want.
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where table_name = <your_table>Edited by: Karthick_Arp on Oct 14, 2008 12:18 AM

How do I make a batch file if the .class file uses a foreign package?

I am trying to make an MS-DOS batch file using the bytecode file from the Java source file, called AddFields.java. This program uses the package BreezySwing; which is not standard with the JDK. I had to download it seperately. I will come back to this batch file later.
But first, in order to prove the concept, I created a Java file called Soap.java in JCreator. It is a very simple GUI program that uses the javax.swing package; which does come with the JDK. The JDK is currently stored in the following directory: C:\Program Files\Java\jdk1.6.0_07. I have the PATH environment variable set to the 'bin' folder of the JDK. I believe that it is important that this variable stay this way because C:\Program Files\Java\jdk1.6.0_07\bin is where the file 'java.exe' and 'javac.exe' are stored. Here is my batch file so far for Soap:
@echo off
cd \acorn
set path=C:\Program Files\Java\jdk1.6.0_07\bin
set classpath=.
java Soap
pause
Before I ran this file, I compiled Soap.java in my IDE and then ran it successfully. Then I moved the .class file to the directory C:\acorn. I put NOTHING ELSE in this folder. then I told the computer where to find the file 'java.exe' which I know is needed for execution of the .class file. I put the above text in Notepad and then saved it as Soap.bat onto my desktop. When I double click on it, the command prompt comes up in a little green box for a few seconds, and then the GUI opens and says "It Works!". Now that I know the concept of batch files, I tried creating another one that used the BreezySwing package.
After I installed my JDK, I installed BreezySwing and TerminalIO which are two foreign packages that make building code much easier. I downloaded the .zip file from Lambert and Osborne called BreezySwingAndTerminalIO.zip. I extracted the files to the 'bin' folder of my JDK. Once I did this, and set the PATH environment variable to the 'bin' folder of my JDK, all BreezySwing and TerminalIO programs that I made worked. Now I wanted to make a batch file from the program AddFields.java. It is a GUI program that imports two packages, the traditional GUI javax.swing package and the foreign package BreezySwing. The user enters two numbers in two DoubleField objects and then selects one of four buttons; one for each arithmetic operation (add, subtract, multiply, or divide). Then the program displays the solution in a third DoubleField object. This program both compiles and runs successfully in JCreator. So, next I moved the .class file from the MyProjects folder that JCreator uses to C:\acorn. I put nothing else in this folder. The file Soap.class was still in there, but I did not think it would matter. Then I created the batch file:
@echo off
cd \acorn
set path=C:\Program Files\Java\jdk1.6.0_07\bin
set classpath=.
java AddFields
pause
As you can see, it is exactly the same as the one for Soap. I made this file in Notepad and called it AddFields.bat. Upon double clicking on the file, I got this error message from command prompt:
Exception in thread "main" java.lang.NoClassDefFoundError: BreezySwing/GBFrame
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:12
4)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
Caused by: java.lang.ClassNotFoundException: BreezySwing.GBFrame
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
... 12 more
Press any key to continue . . .
I know that most of this makes no sense; but that it only means that it cannot find the class BreezySwing or GBFrame (which AddFields extends). Notice, however that it does not give an error for javax.swing. If I change the "set path..." command to anything other than the 'bin' folder of my JDK, I get this error:
'java' is not recognized as an internal or external command,
operable program or batch file.
Press any key to continue . . .
I know this means that the computer cannot find the file 'java.exe' which I believe holds all of the java.x.y.z style packages (native packages); but not BreezySwing or any other foreign packages. Remember, I do not get this error for any of the native Java packages. I decided to compare the java.x.y.z packages with BreezySwing:
I see that all of the native packages are not actually visible in the JDK's bin folder. I think that they are all stored in one of the .exe files in there because there are no .class files in the JDK's bin folder.
However, BreezySwing is different, there is no such file called "BreezySwing.exe"; there are just about 20 .class files all with names like "GBFrame.class", and "GBActionListener.class". As a last effort, I moved all of these .class files directly into the bin folder (they were originally in a seperate folder called BreezySwingAndTerminalIO). This did nothing; even with all of the files in the same folder as java.exe.
So my question is: What do I need to do to get the BreezySwing package recognized on my computer? Is there possibly a download for a file called "BreezySwing.exe" somewhere that would be similar to "java.exe" and contain all of the BreezySwing packages?

There is a lot of detail in your posts. I won't properly quote everything you put (too laborious). Instead I'll just put your words inside quotes (").
"..there are some things about the interface that I do not like."
Like +what?+ This is not a help desk, and I would appreciate you participating in this discussion by providing details of what it is about the 'interface' of webstart that you 'do not like'. They are probably misunderstandings on your part.
"Some of the .jar files I made were so dangerously corrupt, that I had to restart my computer before I could delete them."
Corrupt?! I have never once had the Java tools produce a corrupt Jar. OTOH, the 'cannot delete' problem might relate to the JRE gaining a file lock on the archive at run-time. If the file lock persisted after ending the app., it suggests that the JRE was not properly shut down. This is a bug in the code and should be fixed. Deploying as .class files will only 'hide' the problem (from casual inspection - though the Task Manager should show the orphaned 'java' process).
"I then turned to batch files for their simple structure and portability (I managed to successfully transport a java.util containing batch file from my computer to another). This was what I did:
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That is the +funniest+ thing I've heard on the forums in the last 72 hours. You say that is easy?! Some points.
- editing batch files is not scalable to 100+ machines, let alone 10000+.
- The fact that Java worked on the target machine was because it was +already installed.+ Dragging the 'java.exe' onto a Windows PC which has no Java will not magically make it 'Java enabled'.
And speaking of Java on the client machine. Webstart has in-built mechanisms to ensure that the end user has the minimum required Java version to run the app. - we can also use the [deployJava.js|http://java.sun.com/javase/6/docs/technotes/guides/jweb/deployment_advice.html#deplToolkit] on the original web page, to check for minimum Java before it puts the link to download/install the app. - if the user does not have the required Java, the script should guide them through installing it.
Those nice features in deployJava.js are available to applets and apps. launched using webstart, but they are not available for (plain) Jar's or loose class files. So if 'ensuring the user has Java' is one of the requirements for your launch, you are barking up the wrong tree by deploying loose class files.
Note also that if you abandon webstart, but have your app. set up to work from a Jar, the installation process would be similar to above (though it would not need a .bat file, or editing it). This basic strategy is one way that I provide [Appleteer (as a downloadable ZIP archive)|http://pscode.org/appleteer/#download]. Though I side-step your part 1 by putting the stuff into a Jar with the path Appleteer/ - when the user expands the ZIP, the parts of the app. are already in the Appleteer directory.
Appleteer is also provided as a webstart launched application (and as an applet). Either of those are 'easier' to use than the downloadable ZIP, but I thought I would provide it in case the end user wants to save it to disk and transport the app. to a machine with no internet connection, but with Java (why they would be testing applets on a PC with no internet connection, I am not sure - but the option is there).
"I know that .jar and .exe files are out because I always get errors and I do not like their interfaces. "
What on earth are you talking about? Once the app. is on-screen, the end user would not be able to distinguish between
1) A Jar launched using a manifest.
2) A Jar launched using webstart.
3) Loose class files.
Your fixation on .bat files sounds much like the adage that 'If the only tool you have is a hammer, every job starts to look like a nail'.
Get over them, will you? +Using .bat files is not a practical way to provide a Java app. to the end user+ (and launching an app. from a .bat looks quite crappy and 'second hand' to +this+ user).
Edit 1:
The instructions for running Appleteer as a Jar are further up the page, in the [Running Appleteer: Application|http://pscode.org/appleteer/#application] section.
Edited by: AndrewThompson64 on May 19, 2009 12:06 PM

What is the impact of creating a thread in a class or outside of the class

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I have 2 code examples on how to create new threads.
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The second example Starts and Joins the New Thread Internally.
QUESTIONS:
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// this is the calling class
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class A implements Runnable{
public void run(){
public A(){
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public String getMiscProperties(){
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// this is the calling class
class B implements Runnable{
public void run(){
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Hi,
1. A thread is created only after you do a
new Thread(..); // (or its subclass)It does not matter whether you do that internally or externally. You do not get a new thread from constructing a class that implements Runnable if this class is not a Thread (or its subclass).
In particular, the line:
A p2 = new A();does not create a new thread by itself. You can verify this by putting
System.out.println(Thread.currentThread().getName());before that line and in the class 'A' constructor.
2. No. Your internally created thread will complete first because it is joined before B.run() gets a chance to create another thread.
If you want to start new threads before other threads complete, you have to do so before the join() method, or you can eliminate join() completely. When you call T.join(), that thread waits for thread T to complete before carrying on.

FM/BAPI for assigning a class and value for the class instead of manually d

Hi guys,
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rewards will be given.

Hi
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Characteristic Value
Re: Equipment Characteristic Value
Change Equipment Using Transaction IE02
Regards
pavan

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Spoiler (Highlight to read)
Hi,
I'm fairly new to labview classes and am wondering if it is possible to make public or read the value coming from a lvclass control.
If I highlight the control all the values are listed as private and I can't unbundle the class, of course once I make a vi a member of the lvclass I can unbundle the class. However there are two elements that I want o be globally available, is this possible?
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You need to select your class, not the ctl.
This is the same thing as making a member vi for the class, it's just a shortcut for making a .vi that can output the private date.
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Here are some reading: http://zone.ni.com/devzone/cda/tut/p/id/3574

How to write a JAVA program to execute the SQL queries

I have a database in the Microsoft Access queries and I need to execute the query by some how write the Java program to make it execute the query. because I need to get the different of time so I know how fast each query run.
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You need jdbc-driver for MSAccess for run this example:
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import java.lang.String;
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import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
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import java.io.FileOutputStream;
import java.io.BufferedOutputStream;
import java.lang.System;
import java.lang.Class;
import java.sql.SQLException;
import java.util.Date;
import java.util.Locale;
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import java.sql.Time;
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     EncodingParamName = properties.getProperty( "EncodingParamName");
     EncodingValue = properties.getProperty( "EncodingValue");
     OutputEncoding = properties.getProperty( "OutputEncoding");
     if( properties.getProperty( "AfterLastColumnSeparator").compareToIgnoreCase( "yes") == 0 ||
         properties.getProperty( "AfterLastColumnSeparator").compareToIgnoreCase( "true") == 0)
         AfterLastColumnSeparator = true;
     else
     if( properties.getProperty( "AfterLastColumnSeparator").compareToIgnoreCase( "no") == 0 ||
         properties.getProperty( "AfterLastColumnSeparator").compareToIgnoreCase( "false") == 0)
         AfterLastColumnSeparator = false;
     else{
             System.out.println( "Invalid value for \"AfterLastColumnSeparator\" property (logical expected)");
         System.exit( 0);
     try{
         byte[] EOL = new byte[2];
         EOL[0] = 13;
         EOL[1] = 10;
         Class.forName( DriverName);
         Properties connInfo = new Properties();
         connInfo.put( "user", UserName);
         connInfo.put( "password", Password);
         if( EncodingParamName.length() != 0 && EncodingValue.length() != 0)
          connInfo.put( EncodingParamName, EncodingValue);
             Connection connection = DriverManager.getConnection( DatabaseURL, connInfo);
         FileInputStream in = new FileInputStream( SQLFile);
         byte[] buffer = new byte[in.available()];
         in.read( buffer);
         in.close();
         String SQL = new String( buffer);
             PreparedStatement statement = connection.prepareStatement( SQL);
         Date d1 = new Date();
             System.out.println( "Database connected at " + d1 + " Executing statement...");
            ResultSet resultSet = null;
         if( statement.execute())
          resultSet = statement.getResultSet();
         else{
              System.out.println( "Script updates " + statement.getUpdateCount() + " records.");
          System.exit( 0);
             ResultSetMetaData metaData = resultSet.getMetaData();
             BufferedOutputStream out = new BufferedOutputStream( new FileOutputStream( OutputFile));
         if( NeedColumnHeaders && metaData.getColumnCount() > 0){
          String head = new String();
          for( int i = 1; i < metaData.getColumnCount(); i++)
              head += metaData.getColumnName( i) + Separator;
          head += metaData.getColumnName( metaData.getColumnCount());
          out.write( head.getBytes( OutputEncoding), 0, head.length());
          out.write( EOL, 0, 2);
         String record = new String();
         while( resultSet.next()){
          record = "";
          for( int i = 1; i < metaData.getColumnCount(); i++)
              record += resultSet.getString( i) + Separator;
          record += resultSet.getString( metaData.getColumnCount());
          if( AfterLastColumnSeparator)
              record += Separator;
          out.write( record.getBytes( OutputEncoding), 0, record.length());
          out.write( EOL, 0, 2);
         out.close();
         Date d2 = new Date();
             System.out.println( "Done at " + d2);
             System.out.println( "Executing time " + new Time( d2.getTime() - d1.getTime() - 10800000));
     catch( ClassNotFoundException e){
             System.out.println( e.toString());
     catch( SQLException e){
             System.out.println( e.toString());
     catch( java.io.IOException e){
             System.out.println( e.toString());
     System.exit( 0);
    public static void main( String args[]){
     if( args.length == 1)
         new JDBCClient( args[0]);
     else
         System.out.println( "Usage JDBCClient <properties_file>");
}JDBCClient.properties ( for Oracle database)
DriverName=oracle.jdbc.driver.OracleDriver
DatabaseURL=jdbc:oracle:thin:@192.168.1.1:1521:test
UserName=test
Password=test
SQLFile=test.sql
OutputFile=test.csv
Separator=*
NeedColumnHeaders=yes
EncodingParamName=
EncodingValue=
OutputEncoding=windows-1251
AfterLastColumnSeparator=yestest.sql
select * from users;

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