[jboss-jira] [JBoss JIRA] Commented: (JASSIST-103) Errors appear when starting Weblogic 9.2 samples server with javaassist instrumentations when using jrockit JVM

[Tamir Lahav (JIRA)]

    [ https://jira.jboss.org/jira/browse/JASSIST-103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12517310#action_12517310 ] 

Tamir Lahav commented on JASSIST-103:
-------------------------------------

Hi

Thanks for the quick response. The difference between the 2 cases I mentioned above is not really relevant to the javassist problem, I added it because I thought it can help but maybe it just makes the description more complex.

To make things simpler, using this code:

      CtClass ctClass = classPool.get(formattedClassName); 
      
      if (className.indexOf("ResultSet") > 0)        
      {

        System.out.print("instrumenting " + className + "... " + loader.getClass().getName() + " " + loader + " ");
        CtMethod cm = ctClass.getDeclaredMethod("next");
        cm.insertAfter("System.out.println(\"executing next for " + className + "\");");
        
        System.out.println("instrumented");
        
        return ctClass.toBytecode();
      }

I see the error, and when I comment the insertAfter statement I don't see it.

I'm afraid that trying to reproduce this error not in Weblogic can be very difficult because as you said it may be related to complex class loadings in Weblogic and also to the specific sample code that is executed and the specific sample database tables...

 


> Errors appear when starting Weblogic 9.2 samples server with javaassist instrumentations when using jrockit JVM 
> ----------------------------------------------------------------------------------------------------------------
>
>                 Key: JASSIST-103
>                 URL: https://jira.jboss.org/jira/browse/JASSIST-103
>             Project: Javassist
>          Issue Type: Bug
>    Affects Versions: 3.11.0.GA
>         Environment: Windows XP, Red Hat Linux
>            Reporter: Tamir Lahav
>            Assignee: Shigeru Chiba
>             Fix For: 3.11.0.GA
>
>         Attachments: diff.JPG, SampleTransformer.java
>
>
> I Instrumented Weblogic 9.2 samples server by adding this line to the startup script (<Weblogic-Home>\weblogic92\samples\domains\wl_server\bin\startWebLogic.cmd):
> SET JAVA_TOOL_OPTIONS=-javaagent:C:\dev\workspaces\HEAD\SampleJavaAgent\lib\sample-java-agent.jar
> sample-java-agent.jar contains 2 classes: 
> SampleJavaAgent with this method:
>   public static void premain(String agentArguments, Instrumentation instrumentation)
>   {
>     instrumentation.addTransformer(new SampleTransformer());
>   }
> SampleTransformer with this method:
>    public byte[] transform(ClassLoader loader, String className, Class classBeingRedefined,
>       ProtectionDomain protectionDomain, byte[] classfileBuffer)
>       throws IllegalClassFormatException
>   {
>     final String formattedClassName = className.replace('/', '.');    
>     final ClassPool classPool = ClassPool.getDefault();
>     final ClassPath classPath = new ByteArrayClassPath(formattedClassName, classfileBuffer);
>     
>     classPool.insertClassPath(classPath);
>     try
>     {
>       CtClass ctClass = classPool.get(formattedClassName); 
>       
>       if (className.indexOf("wrapper/ResultSet") > 0 || 
>           className.indexOf("sql/ResultSet") > 0 ||
>           className.indexOf("net/netJDBCResultSet") > 0 ||
>           className.indexOf("ResultSet") > 0)        
>       {
>         System.out.print("instrumenting " + className + "...");
>         CtMethod cm = ctClass.getDeclaredMethod("next");
>         cm.insertAfter("System.out.println(\"executing next for " + className + "\");");
>         
>         System.out.println("instrumented");
>         
>         return ctClass.toBytecode();
>       }
>     }
>     catch (Throwable e)
>     {
>       System.out.println("failed. " + e.getMessage());
>     }
>     
>     return null;
>   }
> When I"m starting Weblogic with the modified startup script I see this error:
> <13:47:52 IST 01/03/2010> <Error> <Store> <BEA-280072> <JDBC store "exampleJDBCStore" failed to open table "examplesWLStore".
> weblogic.store.io.jdbc.JDBCStoreException: [Store:280065][Store:280068]JDBC store failed to initialize. It did not find its database table and failed trying to create a new empty table using the commands in file "/weblogic/store/io/jdbc/ddl/pointbase.ddl". (server="examplesServer" store="exampleJDBCStore" table="examplesWLStore"):(Linked Cause, "java.sql.SQLException: The table "EXAMPLES.EXAMPLESWLSTORE" already exists.")
> 	at weblogic.store.io.jdbc.JDBCStoreIO.createTable(JDBCStoreIO.java:594)
> 	at weblogic.store.io.jdbc.JDBCStoreIO.open(JDBCStoreIO.java:342)
> 	at weblogic.store.internal.PersistentStoreImpl.open(PersistentStoreImpl.java:350)
> 	at weblogic.store.admin.AdminHandler.activate(AdminHandler.java:135)
> 	at weblogic.store.admin.JDBCAdminHandler.activate(JDBCAdminHandler.java:64)
> 	Truncated. see log file for complete stacktrace
> When I changed the "if" statement in the transform method to this:
>       if (className.indexOf("wrapper/ResultSet") > 0 || 
>           className.indexOf("sql/ResultSet") > 0 ||
>           className.indexOf("net/netJDBCResultSet") > 0 ||
>           className.indexOf("ResultSetxxx") > 0)        
> the error disappeared, even according to the system out messages the number of instrumented classes is the same in both cases.
> When I used Sun's JVM by changing JAVA_VENDOR variable in setDomainEnv.cmd script in the same directory the error also disappeared.
> Weblogic 9.2 installation can be found here:
> http://www.oracle.com/technology/software/products/ias/htdocs/wls_main.html

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