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

[Shigeru Chiba (JIRA)]

    [ https://jira.jboss.org/jira/browse/JASSIST-103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12517297#action_12517297 ] 

Shigeru Chiba commented on JASSIST-103:
---------------------------------------

Hi,

Unfortunately, it is very difficult to identify a bug from this report.  The bug might be of Javassist or not.  It might be due to some complex class loading mechanism of WebLogic.  Can you make a test code for clearly spot a bug of Javassist?


> 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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