Help with StuckThread in java.lang.String.equals(String.java:619)

I periodically get a stuck Execute thread on my Weblogic 8.15 server
during a call to a Stateless Session Bean. When I do thread dumps, the
thread is always stuck in the same place (in
java.lang.String.equals(String.java:619) or in the call immediately above it
java.util.LinkedList.indexOf(LinkedList.java:397)). Even though the thread
dump indicates that the thread is in a runnable state, if I do multiple
thread dumps over a period of time, the stack trace always indicates that
the thread is in the same place. The thread remains stuck until Weblogic is
restarted. Other client applictions can make session bean calls, but each
stuck thread seems to still take up lots of CPU time. I have let the stuck
threads run overnight, and the stack trace from the thread dump always shows
them executing the same String/LinkedList code. In each case, our code is
trying to iterate over a collection
Does anybody know what could cause this problem, and how to fix it? I get
StuckThreadMaxTime errors in the log:
####<Dec 4, 2005 10:47:25 AM EST> <Error> <WebLogicServer> <nybill>
<myserver> <weblogic.health.CoreHealthMonitor> <<WLS Kernel>> <>
<BEA-000337> <ExecuteThread: '4' for queue: 'weblogic.kernel.Default' has
been busy for "1,263" seconds working on the request
"ncss.billing.ejb.billAdmin.session.BillAdminSession_uli3xb_EOImpl", which
is more than the configured time (StuckThreadMaxTime) of "1,200" seconds.>
Here are some stack traces from different thread dumps (I have the full
thread dumps if necessary):
"ExecuteThread: '10' for queue: 'weblogic.kernel.Default'" daemon prio=5
tid=0x7720eb98 nid=0xd68 runnable [571f000..571fdb0]
at java.lang.String.equals(String.java:619)
at java.util.LinkedList.indexOf(LinkedList.java:398)
at java.util.LinkedList.contains(LinkedList.java:176)
at
ncss.billing.broadviewBill.xml.XMLBillCreation.getDailyCallSummary(XMLBillCr
eation.java:1992)
at
ncss.billing.broadviewBill.xml.XMLBillCreation.getGraphs(XMLBillCreation.jav
a:1931)
at
ncss.billing.broadviewBill.xml.XMLBillCreation.getLocations(XMLBillCreation.
java:2618)
at
ncss.billing.broadviewBill.xml.XMLBillCreation.createXMLBill(XMLBillCreation
.java:236)
at
ncss.billing.ejb.billAdmin.session.BillAdminSessionEJB.getBillAsXml(BillAdmi
nSessionEJB.java:341)
at
ncss.billing.ejb.billAdmin.session.BillAdminSession_uli3xb_EOImpl.getBillAsX
ml(BillAdminSession_uli3xb_EOImpl.java:100)
at
ncss.billing.ejb.billAdmin.session.BillAdminSession_uli3xb_EOImpl_WLSkel.inv
oke(Unknown Source)
at
weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:477)
at
weblogic.rmi.cluster.ReplicaAwareServerRef.invoke(ReplicaAwareServerRef.java
:108)
at
weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.java:420)
at
weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubjec
t.java:363)
at
weblogic.security.service.SecurityManager.runAs(SecurityManager.java:147)
at
weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:415)
at
weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.java:3
0)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)
"ExecuteThread: '22' for queue: 'weblogic.kernel.Default'" daemon prio=5
tid=0x772538d0 nid=0xe24 runnable [497f000..4fdb0]
at java.lang.String.equals(String.java:619)
at java.util.LinkedList.indexOf(LinkedList.java:398)
at java.util.LinkedList.contains(LinkedList.java:176)
at
ncss.billing.broadviewBill.xml.XMLBillCreation.getMostExpensiveOrLongestCall
s(XMLBillCreation.java:1892)
at
ncss.billing.broadviewBill.xml.XMLBillCreation.getTopTenReport(XMLBillCreati
on.java:1798)
at
ncss.billing.broadviewBill.xml.XMLBillCreation.getTopTenReports(XMLBillCreat
ion.java:1751)
at
ncss.billing.broadviewBill.xml.XMLBillCreation.getLocations(XMLBillCreation.
java:2612)
at
ncss.billing.broadviewBill.xml.XMLBillCreation.createXMLBill(XMLBillCreation
.java:236)
at
ncss.billing.ejb.billAdmin.session.BillAdminSessionEJB.getBillAsXml(BillAdmi
nSessionEJB.java:341)
at
ncss.billing.ejb.billAdmin.session.BillAdminSession_uli3xb_EOImpl.getBillAsX
ml(BillAdminSession_uli3xb_EOIm.java:100)
at
ncss.billing.ejb.billAdmin.session.BillAdminSession_uli3xb_EOImpl_WLSkel.inv
oke(Unknown Source)
at
weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:477)
at
weblogic.rmi.cluster.ReplicaAwareServerRef.invoke(ReplicaAwareServerRef.java
:108)
at
weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.java:420)
at
weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubjec
t.java:363)
at
weblogic.security.service.SecurityManager.runAs(SecurityManager.java:147)
at
weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:415)
at
weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.java:3
0)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)
"ExecuteThread: '21' for queue: 'weblogic.kernel.Default'" daemon prio=5
tid=0x76afb060 nid=0x498 runnable [48af000..48fdb0]
at java.lang.String.equals(String.java:619)
at java.util.LinkedList.indexOf(LinkedList.java:398)
at java.util.LinkedList.contains(LinkedList.java:176)
at
ncss.billing.broadviewBill.xml.XMLBillCreation.getMostFrequentlyCalledNumber
sOrCitiesReport(XMLBillCreation.java:1839)
at
ncss.billing.broadviewBill.xml.XMLBillCreation.getTopTenReport(XMLBillCreati
on.java:1772)
at
ncss.billing.broadviewBill.xml.XMLBillCreation.getTopTenReports(XMLBillCreat
ion.java:1743)
at
ncss.billing.broadviewBill.xml.XMLBillCreation.getLocations(XMLBillCreation.
java:2612)
at
ncss.billing.broadviewBill.xml.XMLBillCreation.createXMLBill(XMLBillCreation
.java:236)
at
ncss.billing.ejb.billAdmin.session.BillAdminSessionEJB.getBillAsXml(BillAdmi
nSessionEJB.java:341)
at
ncss.billing.ejb.billAdmin.session.BillAdminSession_uli3xb_EOImpl.getBillAsX
ml(BillAdminSession_uli3xb_EOImp.java:100)
at
ncss.billing.ejb.billAdmin.session.BillAdminSession_uli3xb_EOImpl_WLSkel.inv
oke(Unknown Source)
at
weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:477)
at
weblogic.rmi.cluster.ReplicaAwareServerRef.invoke(ReplicaAwareServerRef.java
:108)
at
weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.java:420)
at
weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubjec
t.java:363)
at
weblogic.security.service.SecurityManager.runAs(SecurityManager.java:147)
at
weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:415)
at
weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.java:3
0)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)
The code in LinkedList that it seems to be executing is the following:
Line#
397 for (Entry e = header.next; e != header; e = e.next) {
398 if (o.equals(e.element))
399 return index;
400 index++;
401 }
I am running Weblogic 8.15 on Windows 2000.
Thanks for any help,
- Don

njb7ty wrote:
I suggest dropping that example program and concentrating on reading a book on Java such as 'Head First in Java'. Otherwise, you will spend a lot of time trying to get something to work and gain little value from it.Likewise... Jumping into reflections before you can [read a stack-trace|http://www.0xcafefeed.com/2004/06/of-thread-dumps-and-stack-traces/] is like signing up a toddler for the New York Marathon... it's probably simply beyond your skill level... so step back... go read a book, do some tutorials, get your head around just the process of the designing, writing, compiling, running, and debugging java programs... and what the different diagnostics mean... Then, equipped with your nose-clip and your trusty stone ;-) you contemplate leaping into the deep end ;-)
Cheers. Keith.

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Can anybody please provide any pointers to track/solve this issue?
Log extract:
####<Oct 10, 2010 4:27:31 PM PST> <Error> <Deployer> <BOX1> <SERVER2> <[ACTIVE] ExecuteThread: '1' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <1256893524756> <BEA-149265> <Failure occurred in the execution of deployment request with ID '1256893524756' for task '3'. Error is: 'weblogic.application.ModuleException: '
weblogic.application.ModuleException:
at weblogic.servlet.internal.WebAppModule.startContexts(WebAppModule.java:1373)
at weblogic.servlet.internal.WebAppModule.start(WebAppModule.java:468)
at weblogic.application.internal.flow.ModuleStateDriver$3.next(ModuleStateDriver.java:204)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:37)
at weblogic.application.internal.flow.ModuleStateDriver.start(ModuleStateDriver.java:60)
at weblogic.application.internal.flow.ScopedModuleDriver.start(ScopedModuleDriver.java:201)
at weblogic.application.internal.flow.ModuleListenerInvoker.start(ModuleListenerInvoker.java:118)
at weblogic.application.internal.flow.ModuleStateDriver$3.next(ModuleStateDriver.java:205)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:37)
at weblogic.application.internal.flow.ModuleStateDriver.start(ModuleStateDriver.java:60)
at weblogic.application.internal.flow.StartModulesFlow.activate(StartModulesFlow.java:28)
at weblogic.application.internal.BaseDeployment$2.next(BaseDeployment.java:636)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:37)
at weblogic.application.internal.BaseDeployment.activate(BaseDeployment.java:212)
at weblogic.application.internal.EarDeployment.activate(EarDeployment.java:16)
at weblogic.application.internal.DeploymentStateChecker.activate(DeploymentStateChecker.java:162)
at weblogic.deploy.internal.targetserver.AppContainerInvoker.activate(AppContainerInvoker.java:79)
at weblogic.deploy.internal.targetserver.operations.AbstractOperation.activate(AbstractOperation.java:569)
at weblogic.deploy.internal.targetserver.operations.ActivateOperation.activateDeployment(ActivateOperation.java:140)
at weblogic.deploy.internal.targetserver.operations.ActivateOperation.doCommit(ActivateOperation.java:106)
at weblogic.deploy.internal.targetserver.operations.AbstractOperation.commit(AbstractOperation.java:323)
at weblogic.deploy.internal.targetserver.DeploymentManager.handleDeploymentCommit(DeploymentManager.java:820)
at weblogic.deploy.internal.targetserver.DeploymentManager.activateDeploymentList(DeploymentManager.java:1223)
at weblogic.deploy.internal.targetserver.DeploymentManager.handleCommit(DeploymentManager.java:436)
at weblogic.deploy.internal.targetserver.DeploymentServiceDispatcher.commit(DeploymentServiceDispatcher.java:164)
at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.doCommitCallback(DeploymentReceiverCallbackDeliverer.java:181)
at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.access$100(DeploymentReceiverCallbackDeliverer.java:12)
at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer$2.run(DeploymentReceiverCallbackDeliverer.java:68)
at weblogic.work.SelfTuningWorkManagerImpl$WorkAdapterImpl.run(SelfTuningWorkManagerImpl.java:516)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)
java.lang.OutOfMemoryError: class allocation, 21977184 loaded, 20M footprint in check_alloc (classalloc.c:213) 1412 bytes requested.
Java heap 1G reserved, 1G committed
Paged memory=18014398507524232K/16781304K.
Your Java heap size might be set too high.
Try to reduce the Java heap
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at weblogic.utils.classloaders.GenericClassLoader.defineClass(GenericClassLoader.java:335)
at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:288)
at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:256)
at java.lang.ClassLoader.loadClass(ClassLoader.java:303)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
at weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClassLoader.java:176)
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
at java.lang.Class.getConstructor0(Class.java:2699)
at java.lang.Class.newInstance0(Class.java:326)
at java.lang.Class.newInstance(Class.java:308)
at com.sun.faces.config.ConfigureListener.configure(ConfigureListener.java:1058)
at com.sun.faces.config.ConfigureListener.configure(ConfigureListener.java:1129)
at com.sun.faces.config.ConfigureListener.configure(ConfigureListener.java:542)
at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:435)
at weblogic.servlet.internal.EventsManager$FireContextListenerAction.run(EventsManager.java:465)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(Unknown Source)
at weblogic.servlet.internal.EventsManager.notifyContextCreatedEvent(EventsManager.java:175)
at weblogic.servlet.internal.WebAppServletContext.preloadResources(WebAppServletContext.java:1784)
at weblogic.servlet.internal.WebAppServletContext.start(WebAppServletContext.java:2999)
at weblogic.servlet.internal.WebAppModule.startContexts(WebAppModule.java:1371)
at weblogic.servlet.internal.WebAppModule.start(WebAppModule.java:468)
at weblogic.application.internal.flow.ModuleStateDriver$3.next(ModuleStateDriver.java:204)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:37)
at weblogic.application.internal.flow.ModuleStateDriver.start(ModuleStateDriver.java:60)
at weblogic.application.internal.flow.ScopedModuleDriver.start(ScopedModuleDriver.java:200)
at weblogic.application.internal.flow.ModuleListenerInvoker.start(ModuleListenerInvoker.java:117)
at weblogic.application.internal.flow.ModuleStateDriver$3.next(ModuleStateDriver.java:204)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:37)
at weblogic.application.internal.flow.ModuleStateDriver.start(ModuleStateDriver.java:60)
at weblogic.application.internal.flow.StartModulesFlow.activate(StartModulesFlow.java:27)
at weblogic.application.internal.BaseDeployment$2.next(BaseDeployment.java:635)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:37)
at weblogic.application.internal.BaseDeployment.activate(BaseDeployment.java:212)
at weblogic.application.internal.EarDeployment.activate(EarDeployment.java:16)
at weblogic.application.internal.DeploymentStateChecker.activate(DeploymentStateChecker.java:162)
at weblogic.deploy.internal.targetserver.AppContainerInvoker.activate(AppContainerInvoker.java:79)
at weblogic.deploy.internal.targetserver.operations.AbstractOperation.activate(AbstractOperation.java:569)
at weblogic.deploy.internal.targetserver.operations.ActivateOperation.activateDeployment(ActivateOperation.java:140)
at weblogic.deploy.internal.targetserver.operations.ActivateOperation.doCommit(ActivateOperation.java:106)
at weblogic.deploy.internal.targetserver.operations.AbstractOperation.commit(AbstractOperation.java:323)
at weblogic.deploy.internal.targetserver.DeploymentManager.handleDeploymentCommit(DeploymentManager.java:820)
at weblogic.deploy.internal.targetserver.DeploymentManager.activateDeploymentList(DeploymentManager.java:1227)
at weblogic.deploy.internal.targetserver.DeploymentManager.handleCommit(DeploymentManager.java:436)
at weblogic.deploy.internal.targetserver.DeploymentServiceDispatcher.commit(DeploymentServiceDispatcher.java:163)
at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.doCommitCallback(DeploymentReceiverCallbackDeliverer.java:181)
at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.access$100(DeploymentReceiverCallbackDeliverer.java:12)
at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer$2.run(DeploymentReceiverCallbackDeliverer.java:67)
at weblogic.work.SelfTuningWorkManagerImpl$WorkAdapterImpl.run(SelfTuningWorkManagerImpl.java:516)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)

Its running on Solaris 10 platform.The server is configured with 1Gb JVM and JRockit jrrt-4.0.0-1.6.0.
MEM_ARGS="-Xms1g -Xmx1g -Xgcprio:throughput -Xverbose:gc -XX:+HeapDumpOnOutO
fMemoryError -XXcompressedRefs:enable=true"
Let me know if you need any more information to track this issue.

Hi java.lang.System.gc() vs java.lang.Runtime.gc()

hi all what is the exact diff.,
java.lang.System.gc() vs java.lang.Runtime.gc()
why dont I call Runtime.gc() like System.gc(), is ther any possibility ?
Thanks in advance

Thanks, but I just want to call Runtime.gc() like
System.gc() forcefully to invoke finalize() method
Thanks in advanceThe calls are the same. Read the javadoc:
http://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.html#gc()
public static void gc()
Runs the garbage collector.
Calling the gc method suggests that the Java Virtual Machine expend effort toward recycling unused objects in order to make the memory they currently occupy available for quick reuse. When control returns from the method call, the Java Virtual Machine has made a best effort to reclaim space from all discarded objects.
The call System.gc() is effectively equivalent to the call:
Runtime.getRuntime().gc()

Help with calling windows executable and hiding it using java

Hi,
I have a small utility which calls sqlplus from java , which basically executes a sql file .
Process sqlProcess = runtime.exec(command);
Where command is string and has all the required parameters.
(sqlplus_exe , username_password_sid , sql-file_to_execute_path)
This works fine but it pops up a sql plus window on screen which kindof the user has control .
Like the user can close that sqlplus window before the script gets executed completely.
I want that window to be hidden so that user doesn't have any control on the window and can't interfere with the sql execution.
So thoght about windows api , ShellExecute where you can provide a parameter to hide the window.
Details are in below
[http://support.microsoft.com/kb/224816]
Now the options I have considered to call ShellExecute are JNI / JNA / Smooth
I am using eclipse hellios on winxp
JNI
I Got the code from some website which has all the required files from here [http://www.heimetli.ch/shellexec.html]
But I am not able to run the code .
It says Exception in thread "main" java.lang.UnsatisfiedLinkError: no HSWShellExec in java.library.path
which I am not able to resolve .
Even I had put the dll and .h file in the JAVA Build Path> Library section.
JNA
looks very simple .But I don't know which library to load and call which funtion :(
JSMOOTH
It always gives jsmooth.Native.isAvailable() as false.
And I dont know how to make it true
And also thinks that it works the other way around i.e. Jsmooth loads the JVM .Don't know if it can be called from within jvm
So there I am stuck .
Any suggestions guys.
Any example code would be great.
Thanks in advance.
Edited by: Rajinder_Sandhu on Jul 14, 2010 7:58 AM

I got it working with JNI and the sample code from the website
The whole matter was get the path correctly setup in eclipse.
The solution is posted here.
[http://www.eclipsezone.com/eclipse/forums/t49342.html]

Help with Creating a method that takes a string of arrays?

i just begin my intro to programming and im a little stuck we had to write a program yesterday and i managed fine then today we had to work with arrays and i dont know much about arrays so im hoping someone here can point me in the right direction. This is what he wants *"Create a method called "printReceipts" that takes a String array of names (first names only) and prints out a message to customers using their name and telling them what customer number they are. The method should work with an array of any size."*
Im not asking you to do it for me just i gues point out what methods i need to change thanks
package edu.nmhu.cs245;
public class Assignment1 {
     private String messagePrefix1 = "Hello ";
     private String messagePrefix2 = ", \n";
     public String[] getName() {
          String[] names = new String[] {"Lonny", "Gil", "Hosein"};
          return names;
     public String getCompleteMessage(String name, String message) {
          String completeMessage = messagePrefix1 + name + messagePrefix2 + message ;
          return completeMessage;
      * @param args
     public static void main(String[] args) {
          Assignment1 a = new Assignment1();
          String[] names = a.getName();
          for (int i = 0; i < names.length; i++) {
               String printReciepts = a.getCompleteMessage(names,"You are customer number#" +(i+1));
               System.out.println(printReciepts);
               System.out.println();

Focus! You should know what every single line of code is supposed to do! And they should all add up to a larger goal.
Don't just put in stuff that seems like it's part of a relevant example.
     public String[] getName() {
          String[] names = new String[] {"Lonny", "Gil", "Hosein","Sam"};
          return names;
     }Are you supposed to do it that way? Or did it come with the assignment? It's (probably) fine for a homework assignment, but it's hardcoded data, which in practice one normally doesn't do.
          String completeMessage = messagePrefix1 + names + messagePrefix2 + messageSuffix ;Why do this? You're supposed to produce a receipt per use, not for all users at one.
          for (int i = 0; i < names.length; i++) OK, good. You could have used a foreach loop but this is fine.
               String printReciepts = a.getCompleteMessage(names,"You are customer number#" +(i+1));What is "getCompleteMessage"? You didn't define it. Do you think that it is created implicitly because of the local String variable you created called "completeMessage"? It doesn't.           String2 a = new String2();Don't call your class "String2". It doesn't mean anything. Name it after the assignment or something.           a.printReceipts(names);"names" isn't defined. There's a local variable called "names" in the getNames method, but it doesn't exist when you call this and it's unavailable anyway. You probably meant to do           a.printReceipts(a.getName());

Java.lang.NoClassDefFoundError when executing JAVA code

Hy everyone,
Trying to execute some java code through forms I got this error when running my program : java.lang.NoClassDefFoundError : simple (where simple is a java class I developped).
These are the steps I followed:
1- Devopping a simple JAVA class (simple.java) and compiling in JDK 1.4 (for compatibilty with forms 10.1.2.0.2)
2- Creating the JAR file
3- Copying the JAR file in <ORACLE_HOME>\forms\java
4- Adding the adress of the JAR file in CLASSPATH (environment variable of the server)
5- Adding the adress of the JAR file in CLASSPATH (environmental file of OAS default.env)
6- Importing the JAVA class trought forms builder (program>>import java class)
7- Invoking the JAVA class via the PL/SQL packages created by forms builder
8- Running the program
Thanks for your help.
Regards.

In most cases, you should not have to stop and restart OC4J_BI_FORMS to pick such changes. However, since you are having problems, I would ensure that all frmweb processes have been stopped, then stop and restart OC4J_BI_FORMS and retest. If that doesn't work, you should review how you imported the java into your app. Look closely at the Importer options you used and ensure that you have not change the file name at any point. Because you are working with Java, case sensitivity is critical.
Also, where are you seeing the error message? Client java console or in a server side log? If server side, exactly which log file is reporting the problem? I would suggest you post the first 4 ro 5 lines of the error and not just the NoClassDefFound part.

Java.lang.StackOverflowError due to java.beans.XMLEncoder class

Hello,
I am using the XMLEncoder class as follows :
private byte[] serialize(Map decodedBlob) {
ByteArrayOutputStream bObjOut = new ByteArrayOutputStream();
if (decodedBlob == null) {
return null;
} else {
try {
XMLEncoder encode = new XMLEncoder(new GZIPOutputStream(bObjOut));
encode.writeObject(decodedBlob);
encode.flush();
encode.close();
} catch (Exception e) {
e.printStackTrace();
return bObjOut.toByteArray();
} The object decodedBlob is of type HashMap and further contains other HashMaps and ArrayLists as its values. Including values in all the childs there are more than a 200 variables conatined in this HashMap. I need to call the above serialize method for some 2000 such decodedBlob objects .However when i do run my program it gives me the following error after processing some 168 objects only:
Exception in thread "main" java.lang.StackOverflowError
at java.util.Collections$SynchronizedMap.containsKey(Collections.java:1988)
at java.lang.reflect.Proxy.isProxyClass(Proxy.java:630)
at java.beans.MetaData.getPersistenceDelegate(MetaData.java:890)
at java.beans.Encoder.getPersistenceDelegate(Encoder.java:144)
at java.beans.Encoder.writeObject(Encoder.java:68)
at java.beans.XMLEncoder.writeObject(XMLEncoder.java:269)
at java.beans.Encoder.writeObject1(Encoder.java:201)
at java.beans.Encoder.cloneStatement(Encoder.java:209)
at java.beans.Encoder.writeExpression(Encoder.java:273)
at java.beans.XMLEncoder.writeExpression(XMLEncoder.java:384)
at java.beans.PersistenceDelegate.writeObject(PersistenceDelegate.java:112)
at java.beans.Encoder.writeObject(Encoder.java:69)
at java.beans.XMLEncoder.writeObject(XMLEncoder.java:269)
at java.beans.Encoder.writeObject1(Encoder.java:201)
at java.beans.Encoder.cloneStatement(Encoder.java:209)
at java.beans.Encoder.writeExpression(Encoder.java:273)
at java.beans.XMLEncoder.writeExpression(XMLEncoder.java:384)
at java.beans.PersistenceDelegate.writeObject(PersistenceDelegate.java:112)
at java.beans.Encoder.writeObject(Encoder.java:69)
at java.beans.XMLEncoder.writeObject(XMLEncoder.java:269)
at java.beans.Encoder.writeObject1(Encoder.java:201)
at java.beans.Encoder.cloneStatement(Encoder.java:209)
at java.beans.Encoder.writeExpression(Encoder.java:273)
at java.beans.XMLEncoder.writeExpression(XMLEncoder.java:384)
at java.beans.PersistenceDelegate.writeObject(PersistenceDelegate.java:112)
at java.beans.Encoder.writeObject(Encoder.java:69)
at java.beans.XMLEncoder.writeObject(XMLEncoder.java:269)
at java.beans.Encoder.writeObject1(Encoder.java:201)
at java.beans.Encoder.cloneStatement(Encoder.java:209)
at java.beans.Encoder.writeExpression(Encoder.java:273)As can be seen the following lines keep repeating in the error:
at java.beans.Encoder.writeObject(Encoder.java:68)
at java.beans.XMLEncoder.writeObject(XMLEncoder.java:269)
at java.beans.Encoder.writeObject1(Encoder.java:201)
at java.beans.Encoder.cloneStatement(Encoder.java:209)
at java.beans.Encoder.writeExpression(Encoder.java:273)
at java.beans.XMLEncoder.writeExpression(XMLEncoder.java:384)
at java.beans.PersistenceDelegate.writeObject(PersistenceDelegate.java:112)I have seen the other posts regarding the same on the forum but even overriding the mutatesTo as described there doesnt help.
I have also tried increasing the heap size but that also doesnt seem to solve the problem.
Please please help me sort this problem out. Thanks in advance

hey ... i just found a way out .... when i upgraded to version 6 the error simply vanished ... seems there was a bug in d previous version for the XMLEncoder class. Thanks anyway.
So for all the others who are facing similar problem try running the code with jre 1.6 too and see if it solves your problem

How to use java.lang.Class.getMethod() and java.lang.reflect.Method.invoke(

I want to call a specified method of one class dynamically. I use the method
"getMethod()" in package "java.lang.Class" to get method and "invoke()" in
" java.lang.reflect.Method " to invoke method.
The problem is as following :
1. There are two argument in this method "getMethod(String MethodName , Class[] paremterTypes)" in package "Class". I have no idea about the second parameter " Class[] parameterTypes ".what does the argument exactly mean ?
2. There are two argument in the method "invoke(object obj, object[] obj)" in package "Method".
I have no idea about the second parameter "object[] obj ".what is mean ?
I pass " null " value to it and it works.But i pass anothers ,jvm will throw exception.

I have a generic Method Executer that has a method like
public Object execute(String className, String methodName, Object args)
    String fullClassName = packageName + className ;
    Class delegateClass = Class.forName(fullClassName);
    BaseDelegate delegate = (BaseDelegate)delegateClass.newInstance();
    Method method = null;
    if (args == null)
        method = delegateClass.getMethod(methodName, new Class[] {});
        obj = method.invoke(delegate,new Object[] {});
    else
        method = delegateClass.getMethod(methodName, new Class[] {args.getClass()});
        obj = method.invoke(delegate, new Object[]{args});
   }This seems to have problems when I call the method from a class like:
execute("CategoryDelegate", "getCategoryById", new Integer(4144));(I get a NoSuchMethodException)
The method I am trying to execute in CategoryDelegate looks like:
public Category getCategoryById(int categoryId) throws DelegateExceptionI think it has to deal with the difference in the way we handle Primitive Wrappers and Objects. Wrapper we have to use Interger.TYPE and with the rest of the Objects we have to use obj.class.
Am I doing something wrong here? Any suggestions to make it work for primitive wrappers as well as Objects?

Java.lang.UnsupportedClassVersionError while using java mail api

Hi Everybody ,
I am new comer to this forum , and would like to be an active member.
I am getting this error while trying to use the java mail api to send an email using smtp.
The error is as follows :
Exception in thread "main" java.lang.UnsupportedClassVersionError: javax/mail/Message (Unsupported major.minor version 48.0)
Can Anyone please tell where I am wrong.
I am using the following code
==============================================================
Properties props = new Properties();
props.put("mail.smtp.host", "smtp.abc.com");
// create some properties and get the default Session
Session session = Session.getDefaultInstance(props, null);
session.setDebug(debug);
// create a message
Message msg = new MimeMessage(session);
// set the from and to address
InternetAddress addressFrom = new InternetAddress(from);
msg.setFrom(addressFrom);
InternetAddress[] addressTo = new InternetAddress[recipients.length];
for (int i = 0; i < recipients.length; i++)
addressTo[i] = new InternetAddress(recipients);
msg.setRecipients(Message.RecipientType.TO, addressTo);
// Optional : You can also set your custom headers in the Email if you Want
msg.addHeader("MyHeaderName", "myHeaderValue");
// Setting the Subject and Content Type
msg.setSubject(subject);
msg.setContent(message, "text/plain");
Transport.send(msg);
==============================================================

Hi Philip ,
Thanks for the prompt reply , I had installed oracle client services which overid my jdk1.4 installation with jdk1.3 and hence the error. I changed my classpath settings to point to jdk1.4 and it owrked properly.
Thanks once again.
regards,
Rupesh Rajan

Java.lang.NullPointerException in LabSolution02.java

Hi,
I am getting this java.lang.NullPointerException while running LabSolution02.java.
We have only Content services and Records Manager installed. My folder structure is
Site--> container --> library --> files
Code is failing at this point after authentication..
log("Looping through user's requested attributes ...");
returnedAttributes = user.getRequestedAttributes();
int len = (returnedAttributes == null) ? 0 : returnedAttributes.length;
for (int i = 0; i<len; i++)
NamedValue nv = returnedAttributes;
log("found NamedValue pair "
nv.getName() " type: "
+ nv.getValue().getClass().getName());
basically nv.getName() is returning "PERSONAL_WORKSPACE:ID"
but nv.getValue() is returning null. thats why its giving nullpoint exception.
any reason why its not returning any value?

Hi ,
The "Library" item you see in the Content Services Web UI is actually internally named in our product (from an API perspective) as a Workspace.
Do not confuse this Content Services Workspace Item with the Oracle Workspaces product - it is just pure unfortunate conincidence.
Oracle Workspace has its own set of Web Services.
oracle.workspaces.ws.AdministrationService
oracle.workspaces.ws.AnnouncementsService
oracle.workspaces.ws.AttachmentsService
oracle.workspaces.ws.AuthenticationService
oracle.workspaces.ws.DiscussionService
oracle.workspaces.ws.HomeService
oracle.workspaces.ws.InboxService
oracle.workspaces.ws.LibraryService
oracle.workspaces.ws.MeetingsService
oracle.workspaces.ws.S2SAuthenticationService
oracle.workspaces.ws.TasksService
oracle.workspaces.ws.TemplateService
oracle.workspaces.ws.UsersService
oracle.workspaces.ws.ViewsService
oracle.workspaces.ws.WorkspacesService
Whereas the Content Services / Content DB Web Services are:
oracle.ifs.fdk.ArchiveManager
oracle.ifs.fdk.AuditManager
oracle.ifs.fdk.CategoryManager
oracle.ifs.fdk.CommonManager
oracle.ifs.fdk.ContainerManager
oracle.ifs.fdk.DomainManager
oracle.ifs.fdk.FileManager
oracle.ifs.fdk.GroupManager
oracle.ifs.fdk.LockManager
oracle.ifs.fdk.PagingManager
oracle.ifs.fdk.ProgressManager
oracle.ifs.fdk.QuotaManager
oracle.ifs.fdk.RecordsManager
oracle.ifs.fdk.RemoteLoginManager
oracle.ifs.fdk.RequestManager
oracle.ifs.fdk.SearchManager
oracle.ifs.fdk.SecurityManager
oracle.ifs.fdk.ServiceToServiceLoginManager
oracle.ifs.fdk.SessionManager
oracle.ifs.fdk.SortManager
oracle.ifs.fdk.SystemConfigurationManager
oracle.ifs.fdk.TrashManager
oracle.ifs.fdk.UserManager
oracle.ifs.fdk.VersionManager
oracle.ifs.fdk.VirusManager
oracle.ifs.fdk.WorkflowManager
oracle.ifs.fdk.WorkspaceManager
Oracle Workspaces actually leverages the Content Services WorkspaceManager web service in order to create the Library (aka internally workspace) in Content Services that is used as part of the collaboration.
So to clarify things:
Library (UI) = Workspace (API)
Site (UI) = Domain (API)
And Workspace in Content Services API has nothing to do with Oracle Workspaces.
cheers
Matt.

Java.lang.SecurityException when granting java permission

DB version 11.1.07
We used this command to grant the following permission in development and stage environment with no problems.
exec dbms_java.grant_permission( 'SCHEMA', 'SYS:java.lang.RuntimePermission', 'getClassLoader', '' );
When the same command is run in production, it results in this.
ERROR at line 1:
ORA-29532: Java call terminated by uncaught Java exception:
java.lang.SecurityException: policy table update
SYS:java.lang.RuntimePermission, getClassLoader
ORA-06512: at "SYS.DBMS_JAVA", line 787
ORA-06512: at line 1
These commands were executed as SYS user in all environments. Any ideas what could be causing this?
Thanks.
Usman

Either you are only using a security manager in production or there is a difference in the permissions granted by the security domains (for example, .policy files).

Java.lang.UnsupportedClassVersionError in Import Java Classes

Hi,
I have recently upgraded to Forms Developer 10g (10.1.2.3) and JDeveloper (10.1.3.4). I have recompiled my classes in JDeveloper, and when I go to Import them into my form I get
Exception occurred: java.lang.UnsupportedClassVersionError: classes/eps/palms/pickup/client/ResultSpec (Unsupported major.minor version 49.0).
Has anyone any clues as to how to resolve this?
Thanks
Margaret

Yes, the new version of JDeveloper must have the compiler default set to 1.4 or 1.5. Enforce it to 1.3 if you want to use the Bean with the JInitiator.
Francois

Help with StuckThread in java.lang.String.equals(String.java:619)

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