LinkageError: duplicate class definition

I am getting some error codes in my webserver log which I can't seem to figure out. I use IPlanet 6.0
Has anyone seen this error before:
[14/Feb/2002:16:36:29] failure ( 105): Internal error: Unexpected error condition thrown (unknown exception,no description), stack: java.lang.LinkageError: duplicate class definition: dnt/getNumbers
     at java.lang.ClassLoader.defineClass0(Native Method)
     at java.lang.ClassLoader.defineClass(ClassLoader.java:486)
     at java.lang.ClassLoader.defineClass(ClassLoader.java:426)
     at com.iplanet.server.http.servlet.NSServletLoader.loadResource(NSServletLoader.java:387)
     at com.iplanet.server.http.servlet.NSServletLoader.loadClass(NSServletLoader.java:429)
     at com.iplanet.server.http.servlet.NSServletLoader.findClass(NSServletLoader.java:174)
     at com.iplanet.server.http.servlet.NSServletLoader.loadClass(NSServletLoader.java:106)
     at com.iplanet.server.http.servlet.NSServletEntity.load(NSServletEntity.java:337)
     at com.iplanet.server.http.servlet.NSServletEntity.update(NSServletEntity.java:173)
     at com.iplanet.server.http.servlet.NSServletRunner.Service(NSServletRunner.java:410)
The interesting thing about this error is that it only happens when the thread is executing for the first time. Which is right after the web server has been started up.
I've checked that all classes are in the classpath exacty once.
I have no idea what is causing this.
Any help would be very appreciated.
Thank You.
-Mike

Hi,
I hope you have added the classpath in the "context.properties" file, which will be in config directory of your server root directory. You need to restart the server after adding the classpath in the property file.
Please send me your configuration files, 1)obj.conf 2)magnus.conf 3)error.log 4)jvm12.conf
Senthil Babu J
[email protected]

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Java.lang.LinkageError: duplicate class definition

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Getting java.lang.LinkageError: duplicate class definition after new build

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Hi all ,
I am getting this error every time i try to make a new instance of BPEL process using java API .
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Loader: oc4j:10.1.3 Code-Source: /D:/product/10.1.3.1/OracleAS_1/j2ee/home/lib/oc4j-internal.jar Configuration: in META-INF/boot.xml in D:\product\10.1.3.1\OracleAS_1\j2ee\home\oc4j.jar [Root exception is oracle.classloader.util.AnnotatedLinkageError: duplicate class definition: com/oracle/bpel/client/ejb/interfaces/IDeliveryBeanHome Invalid class: com.oracle.bpel.client.ejb.interfaces.IDeliveryBeanHome Loader: orabpel.root:0.0.0 Code-Source: /D:/product/10.1.3.1/OracleAS_1/j2ee/home/applications/orabpel/ejb_ob_engine.jar Configuration: in D:\product\10.1.3.1\OracleAS_1\j2ee\home\applications\orabpel Dependent class: oracle.oc4j.rmi.ClientRmiTypeCache$InterfaceTypeCache Loader: oc4j:10.1.3 Code-Source: /D:/product/10.1.3.1/OracleAS_1/j2ee/home/lib/oc4j-internal.jar Configuration: in META-INF/boot.xml in D:\product\10.1.3.1\OracleAS_1\j2ee\home\oc4j.jar ] [Root exception is javax.naming.NamingException: duplicate class definition: com/oracle/bpel/client/ejb/interfaces/IDeliveryBeanHome 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oracle.oc4j.rmi.ClientRmiTypeCache$InterfaceTypeCache Loader: oc4j:10.1.3 Code-Source: /D:/product/10.1.3.1/OracleAS_1/j2ee/home/lib/oc4j-internal.jar Configuration: in META-INF/boot.xml in D:\product\10.1.3.1\OracleAS_1\j2ee\home\oc4j.jar ]] at com.evermind.server.rmi.RMIClientContext.lookup(RMIClientContext.java:69) at javax.naming.InitialContext.lookup(InitialContext.java:351) at com.oracle.bpel.client.util.BeanRegistry.lookupDeliveryBean(BeanRegistry.java:279) at com.oracle.bpel.client.delivery.DeliveryService.getDeliveryBean(DeliveryService.java:299) at com.oracle.bpel.client.delivery.DeliveryService.post(DeliveryService.java:194) at com.oracle.bpel.client.delivery.DeliveryService.post(DeliveryService.java:178) at welcome.welcome.doPost(welcome.java:159) at javax.servlet.http.HttpServlet.service(HttpServlet.java:763) at javax.servlet.http.HttpServlet.service(HttpServlet.java:856) at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:713) at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:370) at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:871) at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:453) at com.evermind.server.http.HttpRequestHandler.serveOneRequest(HttpRequestHandler.java:221) at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:122) at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:111) at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260) at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303) at java.lang.Thread.run(Thread.java:595) Caused by: javax.naming.NamingException: duplicate class definition: com/oracle/bpel/client/ejb/interfaces/IDeliveryBeanHome Invalid class: com.oracle.bpel.client.ejb.interfaces.IDeliveryBeanHome Loader: orabpel.root:0.0.0 Code-Source: /D:/product/10.1.3.1/OracleAS_1/j2ee/home/applications/orabpel/ejb_ob_engine.jar Configuration: in D:\product\10.1.3.1\OracleAS_1\j2ee\home\applications\orabpel Dependent class: oracle.oc4j.rmi.ClientRmiTypeCache$InterfaceTypeCache Loader: oc4j:10.1.3 Code-Source: /D:/product/10.1.3.1/OracleAS_1/j2ee/home/lib/oc4j-internal.jar Configuration: in META-INF/boot.xml in D:\product\10.1.3.1\OracleAS_1\j2ee\home\oc4j.jar [Root exception is oracle.classloader.util.AnnotatedLinkageError: duplicate class definition: com/oracle/bpel/client/ejb/interfaces/IDeliveryBeanHome Invalid class: com.oracle.bpel.client.ejb.interfaces.IDeliveryBeanHome Loader: orabpel.root:0.0.0 Code-Source: /D:/product/10.1.3.1/OracleAS_1/j2ee/home/applications/orabpel/ejb_ob_engine.jar Configuration: in D:\product\10.1.3.1\OracleAS_1\j2ee\home\applications\orabpel Dependent class: oracle.oc4j.rmi.ClientRmiTypeCache$InterfaceTypeCache Loader: oc4j:10.1.3 Code-Source: /D:/product/10.1.3.1/OracleAS_1/j2ee/home/lib/oc4j-internal.jar Configuration: in META-INF/boot.xml in D:\product\10.1.3.1\OracleAS_1\j2ee\home\oc4j.jar ] at com.evermind.server.rmi.RMICall.throwRecordedException(RMICall.java:100) at com.evermind.server.rmi.RMIClientConnection.waitForJndiResponse(RMIClientConnection.java:425) at com.evermind.server.rmi.RMIClientConnection.lookup(RMIClientConnection.java:233) at com.evermind.server.rmi.RMIClient.lookup(RMIClient.java:302) at com.evermind.server.rmi.RMIClientContext.lookup(RMIClientContext.java:56) ... 18 more Caused by: oracle.classloader.util.AnnotatedLinkageError: duplicate class definition: com/oracle/bpel/client/ejb/interfaces/IDeliveryBeanHome Invalid class: com.oracle.bpel.client.ejb.interfaces.IDeliveryBeanHome Loader: orabpel.root:0.0.0 Code-Source: /D:/product/10.1.3.1/OracleAS_1/j2ee/home/applications/orabpel/ejb_ob_engine.jar Configuration: in D:\product\10.1.3.1\OracleAS_1\j2ee\home\applications\orabpel Dependent class: oracle.oc4j.rmi.ClientRmiTypeCache$InterfaceTypeCache Loader: oc4j:10.1.3 Code-Source: /D:/product/10.1.3.1/OracleAS_1/j2ee/home/lib/oc4j-internal.jar Configuration: in META-INF/boot.xml in D:\product\10.1.3.1\OracleAS_1\j2ee\home\oc4j.jar at oracle.classloader.PolicyClassLoader.defineClass(PolicyClassLoader.java:2287) at oracle.classloader.PolicyClassLoader.findLocalClass(PolicyClassLoader.java:1462) at oracle.classloader.SearchPolicy$FindLocal.getClass(SearchPolicy.java:167) at oracle.classloader.SearchSequence.getClass(SearchSequence.java:119) at oracle.classloader.SearchPolicy.loadClass(SearchPolicy.java:645) at oracle.classloader.PolicyClassLoader.askParentForClass(PolicyClassLoader.java:1289) at oracle.classloader.SearchPolicy$AskParent.getClass(SearchPolicy.java:68) at oracle.classloader.SearchSequence.getClass(SearchSequence.java:119) at oracle.classloader.SearchPolicy.loadClass(SearchPolicy.java:645) at oracle.classloader.PolicyClassLoader.askParentForClass(PolicyClassLoader.java:1289) at oracle.classloader.SearchPolicy$AskParent.getClass(SearchPolicy.java:68) at oracle.classloader.SearchSequence.getClass(SearchSequence.java:119) at oracle.classloader.PolicyClassLoader.internalLoadClass(PolicyClassLoader.java:1674) at oracle.classloader.PolicyClassLoader.loadClass(PolicyClassLoader.java:1635) at java.lang.ClassLoader.loadClass(ClassLoader.java:299) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:242) at oracle.oc4j.rmi.ClientRmiTypeCache$InterfaceTypeCache.getNamedInterfaces(ClientRmiTypeCache.java:98) at oracle.oc4j.rmi.ClientRmiTypeCache$InterfaceTypeCache.getInterfaceType(ClientRmiTypeCache.java:85) at oracle.oc4j.rmi.ClientRmiTypeCache.getCachedType(ClientRmiTypeCache.java:33) at 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com.evermind.server.rmi.RMIConnection.run(RMIConnection.java:107) at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303) at java.lang.Thread.run(Thread.java:595) at com.evermind.server.rmi.RMICall.warningExceptionOriginatesFromTheRemoteServer(RMICall.java:109) at com.evermind.server.rmi.RMICall.throwRecordedException(RMICall.java:91) ... 22 more Caused by: java.lang.LinkageError: duplicate class definition: com/oracle/bpel/client/ejb/interfaces/IDeliveryBeanHome at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:620) at oracle.classloader.PolicyClassLoader.defineClass(PolicyClassLoader.java:2241) at oracle.classloader.PolicyClassLoader.findLocalClass(PolicyClassLoader.java:1462) at oracle.classloader.SearchPolicy$FindLocal.getClass(SearchPolicy.java:167) at oracle.classloader.SearchSequence.getClass(SearchSequence.java:119) at oracle.classloader.SearchPolicy.loadClass(SearchPolicy.java:645) at oracle.classloader.PolicyClassLoader.askParentForClass(PolicyClassLoader.java:1289) at oracle.classloader.SearchPolicy$AskParent.getClass(SearchPolicy.java:68) at oracle.classloader.SearchSequence.getClass(SearchSequence.java:119) at oracle.classloader.SearchPolicy.loadClass(SearchPolicy.java:645) at oracle.classloader.PolicyClassLoader.askParentForClass(PolicyClassLoader.java:1289) at oracle.classloader.SearchPolicy$AskParent.getClass(SearchPolicy.java:68) at oracle.classloader.SearchSequence.getClass(SearchSequence.java:119) at oracle.classloader.PolicyClassLoader.internalLoadClass(PolicyClassLoader.java:1674) at oracle.classloader.PolicyClassLoader.loadClass(PolicyClassLoader.java:1635) at java.lang.ClassLoader.loadClass(ClassLoader.java:299) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:242) at oracle.oc4j.rmi.ClientRmiTypeCache$InterfaceTypeCache.getNamedInterfaces(ClientRmiTypeCache.java:98) at oracle.oc4j.rmi.ClientRmiTypeCache$InterfaceTypeCache.getInterfaceType(ClientRmiTypeCache.java:85) at oracle.oc4j.rmi.ClientRmiTypeCache.getCachedType(ClientRmiTypeCache.java:33) at com.evermind.server.rmi.RMIClientConnection.getBoundObject(RMIClientConnection.java:1018) at com.evermind.server.rmi.RMIClientInputStream.resolveObject(RMIClientInputStream.java:26) at java.io.ObjectInputStream.checkResolve(ObjectInputStream.java:1346) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:339) at com.evermind.server.rmi.RMIClientConnection.handleLookupResponse(RMIClientConnection.java:879) at com.evermind.server.rmi.RMIClientConnection.handleOrmiCommandResponse(RMIClientConnection.java:337) at 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Hi,
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Thanks
Pranay

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     Configuration: jre bootstrap
     at oracle.classloader.PolicyClassLoader.findLocalClass (PolicyClassLoader.java:1462) [D:/Jdev10133/j2ee/home/lib/pcl.jar (from system property java.class.path), by sun.misc.Launcher$AppClassLoader@17332331]     at oracle.classloader.SearchPolicy$FindLocal.getClass (SearchPolicy.java:167) [D:/Jdev10133/j2ee/home/lib/pcl.jar (from system property java.class.path), by sun.misc.Launcher$AppClassLoader@17332331]     at oracle.classloader.SearchSequence.getClass (SearchSequence.java:119) [D:/Jdev10133/j2ee/home/lib/pcl.jar (from system property java.class.path), by sun.misc.Launcher$AppClassLoader@17332331]     at oracle.classloader.SearchPolicy.loadClass (SearchPolicy.java:645) [D:/Jdev10133/j2ee/home/lib/pcl.jar (from system property java.class.path), by sun.misc.Launcher$AppClassLoader@17332331]     at oracle.classloader.PolicyClassLoader.askParentForClass (PolicyClassLoader.java:1289) [D:/Jdev10133/j2ee/home/lib/pcl.jar (from system property java.class.path), by sun.misc.Launcher$AppClassLoader@17332331]     at oracle.classloader.SearchPolicy$AskParent.getClass (SearchPolicy.java:68) [D:/Jdev10133/j2ee/home/lib/pcl.jar (from system property java.class.path), by sun.misc.Launcher$AppClassLoader@17332331]     at oracle.classloader.SearchSequence.getClass (SearchSequence.java:119) [D:/Jdev10133/j2ee/home/lib/pcl.jar (from system property java.class.path), by sun.misc.Launcher$AppClassLoader@17332331]     at oracle.classloader.PolicyClassLoader.internalLoadClass (PolicyClassLoader.java:1674) [D:/Jdev10133/j2ee/home/lib/pcl.jar (from system property java.class.path), by sun.misc.Launcher$AppClassLoader@17332331]     at oracle.classloader.PolicyClassLoader.loadClass (PolicyClassLoader.java:1635) [D:/Jdev10133/j2ee/home/lib/pcl.jar (from system property java.class.path), by sun.misc.Launcher$AppClassLoader@17332331]     at oracle.classloader.PolicyClassLoader.loadClass (PolicyClassLoader.java:1620) [D:/Jdev10133/j2ee/home/lib/pcl.jar (from system property java.class.path), by sun.misc.Launcher$AppClassLoader@17332331]     at java.lang.ClassLoader.loadClassInternal (ClassLoader.java:319) [jre bootstrap, by jre.bootstrap:1.5.0_06]     at java.lang.Class.forName0 (Native method) [unknown, by unknown]     at java.lang.Class.forName (Class.java:242) [jre bootstrap, by jre.bootstrap:1.5.0_06]     at java.sql.DriverManager.getCallerClass (DriverManager.java:442) [jre bootstrap, by jre.bootstrap:1.5.0_06]     at java.sql.DriverManager.getConnection (DriverManager.java:519) [jre bootstrap, by jre.bootstrap:1.5.0_06]     at java.sql.DriverManager.getConnection (DriverManager.java:171) [jre bootstrap, by jre.bootstrap:1.5.0_06]     at com.util.Util.getConnection (Util.java:14) [D:/Jdev10133/jdev/mywork/Trainning/DBProgramming/classes/ (from <classpath> in D:\Jdev10133\jdev\mywork\Trainning\DBProgramming\public_html), by current-workspace-app.web.dbprogram:0.0.0]     at com.blob.BLOBTest.uploadFileToDB (BLOBTest.java:37) [D:/Jdev10133/jdev/mywork/Trainning/DBProgramming/classes/ (from <classpath> in D:\Jdev10133\jdev\mywork\Trainning\DBProgramming\public_html), by current-workspace-app.web.dbprogram:0.0.0]     at com.upload.doPost (upload.java:28) [D:/Jdev10133/jdev/mywork/Trainning/DBProgramming/classes/ (from <classpath> in D:\Jdev10133\jdev\mywork\Trainning\DBProgramming\public_html), by current-workspace-app.web.dbprogram:0.0.0]     at javax.servlet.http.HttpServlet.service (HttpServlet.java:763) [D:/Jdev10133/j2ee/home/lib/servlet.jar (from <code-source> (ignore manifest Class-Path) in META-INF/boot.xml in D:\Jdev10133\j2ee\home\oc4j.jar), by api:1.4.0]     at javax.servlet.http.HttpServlet.service (HttpServlet.java:856) [D:/Jdev10133/j2ee/home/lib/servlet.jar (from <code-source> (ignore manifest Class-Path) in META-INF/boot.xml in D:\Jdev10133\j2ee\home\oc4j.jar), by api:1.4.0]     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].server.http.ServletRequestDispatcher.invoke (ServletRequestDispatcher.java:713) [D:/Jdev10133/j2ee/home/lib/oc4j-internal.jar (from <code-source> in META-INF/boot.xml in D:\Jdev10133\j2ee\home\oc4j.jar), by oc4j:10.1.3]     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].server.http.ServletRequestDispatcher.forwardInternal (ServletRequestDispatcher.java:370) [D:/Jdev10133/j2ee/home/lib/oc4j-internal.jar (from <code-source> in META-INF/boot.xml in D:\Jdev10133\j2ee\home\oc4j.jar), by oc4j:10.1.3]     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].server.http.HttpRequestHandler.doProcessRequest (HttpRequestHandler.java:871) [D:/Jdev10133/j2ee/home/lib/oc4j-internal.jar (from <code-source> in META-INF/boot.xml in D:\Jdev10133\j2ee\home\oc4j.jar), by oc4j:10.1.3]     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].server.http.HttpRequestHandler.processRequest (HttpRequestHandler.java:453) [D:/Jdev10133/j2ee/home/lib/oc4j-internal.jar (from <code-source> in META-INF/boot.xml in D:\Jdev10133\j2ee\home\oc4j.jar), by oc4j:10.1.3]     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].server.http.HttpRequestHandler.serveOneRequest (HttpRequestHandler.java:221) [D:/Jdev10133/j2ee/home/lib/oc4j-internal.jar (from <code-source> in META-INF/boot.xml in D:\Jdev10133\j2ee\home\oc4j.jar), by oc4j:10.1.3]     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].server.http.HttpRequestHandler.run (HttpRequestHandler.java:122) [D:/Jdev10133/j2ee/home/lib/oc4j-internal.jar (from <code-source> in META-INF/boot.xml in D:\Jdev10133\j2ee\home\oc4j.jar), by oc4j:10.1.3]     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].server.http.HttpRequestHandler.run (HttpRequestHandler.java:111) [D:/Jdev10133/j2ee/home/lib/oc4j-internal.jar (from <code-source> in META-INF/boot.xml in D:\Jdev10133\j2ee\home\oc4j.jar), by oc4j:10.1.3]     at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run (ServerSocketReadHandler.java:260) [D:/Jdev10133/j2ee/home/lib/oc4j-internal.jar (from <code-source> in META-INF/boot.xml in D:\Jdev10133\j2ee\home\oc4j.jar), by oc4j:10.1.3]     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].util.ReleasableResourcePooledExecutor$MyWorker.run (ReleasableResourcePooledExecutor.java:303) [D:/Jdev10133/j2ee/home/lib/oc4j-internal.jar (from <code-source> in META-INF/boot.xml in D:\Jdev10133\j2ee\home\oc4j.jar), by oc4j:10.1.3]     at java.lang.Thread.run (Thread.java:595) [jre bootstrap, by jre.bootstrap:1.5.0_06]
Please help to suggest me. How should I do to let out this error?
Thanks

many people use the two interchangeably, though technically it can mean something different.
What you get back from a call to newInstance() is the same as what you'd get when using the new keyword and no constructor arguments, a reference to an instance of a class (there are other ways to dynamically create an instance using other constructors).
"Creating a class object" technically means loading the class which causes a Class instance (so an instance of the class Class) to be created for that particular class, making the class available to the JVM for instantiation of instances.
newInstance() and its sisters are useful for when the class to be instantiated is not known (or even doesn't exist) when compiling the class that needs to instantiate it.
This is of course the case with JDBC. The people creating the JVM can't know what driver classes will be out there at some point in the future (and if they did know and have access to all of them in the past it would still be foolish to have them all hardwired into the JVM).

Duplicate class definition: org/apache/jasper/runtime/HttpJspBase

I am getting a duplicate class definition in an web server class. I have no idea how to solve this, besides the errors appears only sometimes...
Any ideas ???
duplicate class definition: org/apache/jasper/runtime/HttpJspBase
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:484).

I'm getting exactly the same problem and I can't see a proper solution.
I would appreciate any help.
Thanks,
Mauro.

Getting LinkageError with class loader

I've written a class loader which extends java.net.URLClassLoader. My class is called EntryClassLoader. It only ovverides findClass() so that it will search a user-supplied path for a class. Beloww is the code:
public Class findClass(String className) throws ClassNotFoundException
try {
// First check to see if the user has prepended some
// directory path
if (className.indexOf(File.separatorChar) != -1) {
String path = className.substring(0,
className.lastIndexOf(File.separatorChar));
className = className.substring(className.lastIndexOf(File.separatorChar)
+ 1);
addURL(new File(path).toURL());
return super.findClass(className);
catch (MalformedURLException e) {
e.printStackTrace();
return null;
Here's a sample test program I've written:
public static void main(String args[]) throws Exception {
EntryClassLoader loader = new EntryClassLoader();
loader.findClass("TestPlayer");
loader.findClass("TestPlayer");
If I comment out the 2nd call to findClass(), the program runs fine, and I know that TestPlayer is successfully loaded. With the code as is however, I get the following error:
Exception in thread "main" java.lang.LinkageError: duplicate class definition: TestPlayer
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:509)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:246)
at java.net.URLClassLoader.access$100(URLClassLoader.java:54)
at java.net.URLClassLoader$1.run(URLClassLoader.java:193)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:186)
at nirex.EntryClassLoader.findClass(EntryClassLoader.java:33)
at TestLoader.main(TestLoader.java:8)
Could someone please explain why I might be getting this error. And I really don't understand why it works if I only call findClass() once. Thanks.
John

Check if findLoadedClass(className) is null and load only then. If findLoadedClass() returns a non-null value, the class has already been loaded.

Server side helpset - duplicate class

My application running on JBoss throws the following
HTTP ERROR: 500 duplicate class definition: javax/help/HelpSet$HelpSetParser
This is for a server side helpset. Can any one help me on solving the issue.
Also when i run it twice i get the pages I get,
HTTP ERROR: 500 duplicate class definition: javax/help/JHelpTOCNavigator
HTTP ERROR: 500 javax.help.NavigatorView.getImageID()Ljavax/help/Map$ID;
Can any one help on this error.

First Make a deep look at your code
- Check that you havent declared the class some where twice.
Then
- Check you XML file that it is possible that you have added there your class twice
Or
- Your XML file is pointing to more than one location and both locations are having a copy of your class file.

Class definition

hello, i need a class definition for a digital watch in Java.

1. you'll pass 3 parameters into the constructor (1 for time, 1 for alarm, 1 for ...).
2. your setTime and setAlarm methods will look something like this:
void setTime(param)
timeVariable = param;
void setAlarm(param)
alarmVariable = param;
Simple as that. Hope this helps!!

Class Definition & Implementation

Hi,
In JAVA or Other OOP languages the class definition & implementation are doing within the same task i.e with in the class only they are defining & implementing.But when it comes to ABAP the definition part & implementation part of a class are divided into 2 tasks. Why they are designed like that?

Hi Suresh Reddy,
The main intention behind this design is
" to differentiate the class definition and implementation clearly ."
Even if you have a chance to including both class definition and implementation in same structure, it is difficult to differentiate these things in lengthy implementation classes.
Thank you,
Prasad GVK.

Error message: 1021: Duplicate function definition.

Hi All,
First let me start by saying that I know next to nothing about Flash. I have inherited a website maintenance project that has a Flash rotating image banner. I have managed to get the images to fade-in and fade-out correctly, but now I need to make these images clickable - linking images to pages in the website. I have read many posts here and have reviewed the video tutorials. I have been able to get the first image clickable using this AS3 action:
mars_btn.addEventListener(MouseEvent.CLICK, buttonClickHandler);
function buttonClickHandler(event:MouseEvent) :void {
        navigateToURL(new URLRequest("http://somewebsite/mars.php"));
        trace("I'm clicked");
However, when I attempt to make another image clickable by using a different instance of a button I get the error message:
1021: Duplicate function definition.
I have a separate instance of a button with this AS3 action:
jupiter_btn.addEventListener(MouseEvent.CLICK, buttonClickHandler);
function buttonClickHandler(event:MouseEvent) :void {
        navigateToURL(new URLRequest("http://somewebsite/jupiter.php"));
        trace("I'm clicked");
Obviously I'm not understanding how I'm supposed to do this so that I don't create a duplicate function definition. Any help would be most appreciated.

excuse me , I have a question i hope that you help .. ( im new in here )
we were asked to create an interactive application on flash in two languages..
so i created two different fla files same exact codings ... i was wondering how can i combine them so the viewer can be able to choose the language from a button ?
when i try to combine them i get lots of errors of duplications in the actionscript
PS : MY MAIN PAGE INCLUDES A CAROUSEL with images ..
I was thinking of saving one of the fla as a movie and then add it some how to the second fla and combine it with a button but i can't figure it how..
i hope i was clear enough.. but is there any possibility to help me please ?!
when i tend to change names or something it creates error.. ( IM NOT A PRO IN AS3 ) and when i dublicate the scenes it give duplication errors.. WHAT IS THE SOLUTION ??
this is the code of the actionscript in the main page.. ( the carousel's code i took from someone ) and i used it on my project
import com.ccanvas.carousel.*;
var centerX:Number = stage.stageWidth/4;
var centerY:Number = stage.stageHeight/4;
var carc:Carousel = new Carousel(centerX, centerY, 256, 75, "icons.xml");
carc.addTooltip(new tooltip); // use 'tooltip' movieclip for item tooltip
addChild(carc); // add carousel to stage
function down(event:MouseEvent):void {
trace(event.currentTarget.toolText); // simple click interaction
function destroyCarousel(event:MouseEvent):void {
carc.destroy(); // remove all item in carousel as well as tooltip
function removeNextItem(event:MouseEvent):void {
if(carc.numOfItems > 2) {
carc.removeItem(2); // remove the item next to the remove item icon
create.addEventListener("mouseDown", createCarousel);
function createCarousel(event:MouseEvent):void {
if(carc.CREATED == false) {
// recreate the carousel
carc = new Carousel(centerX, centerY, 256, 75, "icons.xml");
carc.addTooltip(new tooltip);
addChild(carc);
}/* Click to Go to Scene and Play
Clicking on the specified symbol instance plays the movie from the specified scene and frame.
Instructions:
1. Replace "Scene 3" with the name of the scene you would like play.
2. Replace 1 with the frame number you would like the movie to play from in the specified scene.
Tools_button.addEventListener(MouseEvent.CLICK, fl_ClickToGoToScene);
function fl_ClickToGoToScene(event:MouseEvent):void
MovieClip(this.root).gotoAndPlay(1, "Toolse");
}/* Click to Go to Scene and Play
Clicking on the specified symbol instance plays the movie from the specified scene and frame.
Instructions:
1. Replace "Scene 3" with the name of the scene you would like play.
2. Replace 1 with the frame number you would like the movie to play from in the specified scene.
games_button.addEventListener(MouseEvent.CLICK, fl_ClickToGoToGames);
function fl_ClickToGoToGames(event:MouseEvent):void
MovieClip(this.root).gotoAndPlay(1, "Gamese");
}/* Click to Go to Scene and Play
Clicking on the specified symbol instance plays the movie from the specified scene and frame.
Instructions:
1. Replace "Scene 3" with the name of the scene you would like play.
2. Replace 1 with the frame number you would like the movie to play from in the specified scene.
Identity_button.addEventListener(MouseEvent.CLICK, fl_ClickToGoToIdentity);
function fl_ClickToGoToIdentity(event:MouseEvent):void
MovieClip(this.root).gotoAndPlay(1, "Identitye");
}/* Click to Go to Scene and Play
Clicking on the specified symbol instance plays the movie from the specified scene and frame.
Instructions:
1. Replace "Scene 3" with the name of the scene you would like play.
2. Replace 1 with the frame number you would like the movie to play from in the specified scene.
Reviews_button.addEventListener(MouseEvent.CLICK, fl_ClickToGoToScene_13);
function fl_ClickToGoToScene_13(event:MouseEvent):void
MovieClip(this.root).gotoAndPlay(1, "Reviewse");
}/* Click to Go to Scene and Play
Clicking on the specified symbol instance plays the movie from the specified scene and frame.
Instructions:
1. Replace "Scene 3" with the name of the scene you would like play.
2. Replace 1 with the frame number you would like the movie to play from in the specified scene.
Facts_button.addEventListener(MouseEvent.CLICK, fl_ClickToGoToScene_20);
function fl_ClickToGoToScene_20(event:MouseEvent):void
MovieClip(this.root).gotoAndPlay(1, "Factse");

Duplicate function definition error on buttons

Hi there!
Ok first I'm a complete beginner when it comes to Flash so please bare with me.
What I'm looking to do is create a banner that transitions between different photos while there are small square buttons on the side that when the user clicks on them, it jumps to the corrosponding frame where a new photo begins showing. I've seen it a bunch of times on other websites.
After following the advice found here: http://forums.adobe.com/thread/781826?tstart=0
Everything was going well until I hit a snag. When trying to preview my movie I got the following error:
1021: Duplicate function definition
Now, I know there is a very obvious error here in my button scripts, but as I said, I have no idea what I'm doing. Can someone look at my code and tell me what's wrong and what I should change? I'll post all five scripts.
The instance names by the way are "sidebutton1" thru "sidebutton5" if that's any help.
Here's my codes for each of the five buttons (one of these code bits per button):
sidebutton1.addEventListener(MouseEvent.CLICK,f);
function f(e:Event):void{
gotoAndPlay(1);
sidebutton2.addEventListener(MouseEvent.CLICK,f);
function f(e:Event):void{
gotoAndPlay(100);
sidebutton3.addEventListener(MouseEvent.CLICK,f);
function f(e:Event):void{
gotoAndPlay(200);
sidebutton4.addEventListener(MouseEvent.CLICK,f);
function f(e:Event):void{
gotoAndPlay(300);
sidebutton5.addEventListener(MouseEvent.CLICK,f);
function f(e:Event):void{
gotoAndPlay(500);

sidebutton2.addEventListener(MouseEvent.CLICK,f2);
function f2(e:Event):void{
gotoAndPlay(100);
sidebutton3.addEventListener(MouseEvent.CLICK,f3);
function f3(e:Event):void{
gotoAndPlay(200);
Each function must have a special name...

Is the "Device Class Definition for Physical Interface Devices" specification implemented in Windows?

Can I assume that Windows will be able to handle my physical interface device if I follow the "Device Class Definition for Physical Interface Devices" specification while writing the firmware?
I'm trying to develop a device which handles rumble output from applications such as games. Applications would include e.g. racing games or simulators. I'm hesitant to just clone Xbox 360 Gamepad or Sidewinder USB reports. I'd like to correctly declare my
device as something on its own while still making use of already implemented OS-specific drivers. The purpose of the mentioned specification is exactly that as far as I can tell. I wasn't able to find concrete information about its level of support though.
The "USB device class drivers included in Windows" page (sorry I'm not allowed to post links yet..) seems to link to WinUSB which I'm not sure what to do with.

Thanks for your response. Well if everything was implemented at that time and it's still available it should be fine since the specification document's last version is dated 1999. I was just hoping there would be any form of documentation whether it's
supported and by which degree so I don't go through the trouble of figuring out how the firmware should be written according to the specification just to find out there is no OS driver implementation for it which would render my work more or less useless.
So I suppose I'm forced to go the trial and error path?

Duplicate class, modifier private not allowed

I can't get javadoc to create doc for any class I make, I keep on getting these errors
here is the class:/**
* Like Integer, but isn't.
* @author Phillip Bradbury
public class Int
/** the internal value */
private int i;
   * Creates an Int.
public Int(int val)
    i = val;
   * Gets the value passed in the constructor.
   * @returns the value
public int get()
    return i;
}and the error:cspc49-c3018900: javadoc temppack -d doc
Loading source files for package temppack...
Constructing Javadoc information...
/nfs/student1/csse/c3018900/./temppack/Int.java:5: duplicate class: Int
public class Int
       ^
/nfs/student1/csse/c3018900/./temppack/Int.java:8: modifier private not allowed here
private int i;
              ^
javadoc: warning - No source files for package temppack
Standard Doclet version 1.4.1
Generating doc/constant-values.html...
javadoc: No public or protected classes found to document.
1 errors
3 warningswhat am I missing?
I've tried using -classpath and -sourcepath with a lot of different weird and wonderful paths (including ., temppack/ and somewhere completely unrelated to Java), i've tried it with a compiled .class file there and not there, i've tried remaning the class and package to random gibberish in case there was a conflict, and now I'm out of ideas.
Thanks in advance,
=====
Phlip

This is curious.
classes
+-doc
+-temppack
doc is empty, and temppack contains only Int.java
...but if I run
javadoc temppack -d doc
in the classes folder I get the duplicate class / private
not allowed errorsIf you're using 1.4.1, it has a bug that you might be seeing
that is present in 1.4.0 and 1.4.1 but in no other versions.
I recommend you upgrade to 1.4.2, which fixes this bug:
Execution: Fixed so duplicate classes are documented (4673477, tool, REGRESSION)
http://developer.java.sun.com/developer/bugParade/bugs/4673477.html
Here is the list of other enhancements in 1.4.2:
http://java.sun.com/j2se/1.4.2/docs/tooldocs/javadoc/whatsnew-1.4.2.html
execute the following on the commandline
javadoc -package temppack
Yep, it works perfectly with -package there!The -package option should make a difference only if
your class or members are package-private (which they are not).
The default is to allow public and protected program elements
to be documented. When you add -package, all it does is
also package-private program elements to be documented:
http://java.sun.com/j2se/1.4.2/docs/tooldocs/solaris/javadoc.html#package
-Doug

LinkageError: duplicate class definition

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