Java.lang.UnsupportedClassVersionError with ADF and Websphere

I'm trying to get an app running with ADF/Tomahawk/MyFaces/Facelets going on Websphere 6.0. However Websphere is running with a 1.4.2 JVM instead of 1.5 so I get an error when it comes to the ADF NavigationHandlerImpl which has been built with Java 1.5. Is there a Java 1.4 version of ADF faces I should have downloaded somewhere?
Hints appreciated.
Regards, Murray
==<logs below >=================================
[5/4/06 13:15:47:816 GMT] 00000011 FacesConfigur I Reading config /WEB-INF/faces-config.xml
[5/4/06 13:15:48:236 GMT] 00000011 WebApp E LinkageError while defining class: oracle.adfinternal.view.faces.application.NavigationHandlerImpl
Could not be defined due to: oracle/adfinternal/view/faces/application/NavigationHandlerImpl (Unsupported major.minor version 49.0)
This is often caused by having a class defined at multiple
locations within the classloader hierarchy. Other potential causes
include compiling against an older or newer version of the class
that has an incompatible method signature.
Dumping the current context classloader hierarchy:
==> indicates defining classloader
==>[0]
com.ibm.ws.classloader.CompoundClassLoader@7d4e3ab9
Local ClassPath: C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\classes;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\activation-1.0.2.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\adf-facelets.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\adf-faces-api-ea20-SNAPSHOT.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\adf-faces-impl-ea20-SNAPSHOT.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\aui.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\common-annotations.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\commons-beanutils-1.7.0.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\commons-codec-1.3.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\commons-collections-3.1.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\commons-digester-1.6.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\commons-el-1.0.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\commons-fileupload-1.1.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\commons-io-1.2.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\commons-lang-2.1.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\commons-logging-1.0.4.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\el-api.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\el-ri.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\jsf-facelets1014.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\jsp-api.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\jstl-1.1.0.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\log4j-1.2.13.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\mob-impl-files.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\mob-layer-interfaces.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\mob-layer-standalone.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\myfaces-api-1.1.3-SNAPSHOT.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\myfaces-impl-1.1.3-SNAPSHOT.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\portlet.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\serializer.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\tomahawk-1.1.2-SNAPSHOT.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\xalan.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\xercesImpl.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\xml-apis.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\xpp3_min-1.1.3.4.O.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\xstream-1.1.3.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war\WEB-INF\lib\xstream-with-attributes.jar;C:\apps\WebSphere60\profiles\default\installedApps\localhostNode01Cell\aui_war.ear\aui.war;
Delegation Mode: PARENT_FIRST
[1] com.ibm.ws.classloader.JarClassLoader@630356666 Local Classpath: Delegation mode: PARENT_FIRST
[2] com.ibm.ws.classloader.ProtectionClassLoader@2333faba
[3] com.ibm.ws.bootstrap.ExtClassLoader@7f427ab8
[4] sun.misc.Launcher$AppClassLoader@7f4cbab8
[5] sun.misc.Launcher$ExtClassLoader@7f30bab8
---Original exception---
java.lang.UnsupportedClassVersionError: oracle/adfinternal/view/faces/application/NavigationHandlerImpl (Unsupported major.minor version 49.0)
     at java.lang.ClassLoader.defineClass0(Native Method)
     at java.lang.ClassLoader.defineClass(ClassLoader.java(Compiled Code))
     at java.security.SecureClassLoader.defineClass(SecureClassLoader.java(Compiled Code))
     at com.ibm.ws.classloader.CompoundClassLoader._defineClass(CompoundClassLoader.java:576)
     at com.ibm.ws.classloader.CompoundClassLoader.findClass(CompoundClassLoader.java(Compiled Code))
     at com.ibm.ws.classloader.CompoundClassLoader.loadClass(CompoundClassLoader.java:414)
     at java.lang.ClassLoader.loadClass(ClassLoader.java(Compiled Code))
     at java.lang.Class.forName0(Native Method)
     at java.lang.Class.forName(Class.java:260)
     at org.apache.myfaces.shared_impl.util.ClassUtils.classForName(ClassUtils.java:131)
     at org.apache.myfaces.shared_impl.util.ClassUtils.simpleClassForName(ClassUtils.java:157)
     at org.apache.myfaces.config.FacesConfigurator.getApplicationObject(FacesConfigurator.java:521)
     at org.apache.myfaces.config.FacesConfigurator.configureApplication(FacesConfigurator.java:448)
     at org.apache.myfaces.config.FacesConfigurator.configure(FacesConfigurator.java:131)
     at org.apache.myfaces.webapp.StartupServletContextListener.initFaces(StartupServletContextListener.java:66)
     at org.apache.myfaces.webapp.StartupServletContextListener.contextInitialized(StartupServletContextListener.java:49)
     at com.ibm.ws.webcontainer.webapp.WebApp.notifyServletContextCreated(WebApp.java:1355)
     at com.ibm.ws.webcontainer.webapp.WebApp.initialize(WebApp.java:371)
     at com.ibm.ws.webcontainer.webapp.WebGroup.addWebApplication(WebGroup.java:114)
     at com.ibm.ws.webcontainer.VirtualHost.addWebApplication(VirtualHost.java:127)
     at com.ibm.ws.webcontainer.WebContainer.addWebApp(WebContainer.java:776)
     at com.ibm.ws.webcontainer.WebContainer.addWebApplication(WebContainer.java:729)
     at com.ibm.ws.runtime.component.WebContainerImpl.install(WebContainerImpl.java:140)
     at com.ibm.ws.runtime.component.WebContainerImpl.start(WebContainerImpl.java:360)
     at com.ibm.ws.runtime.component.ApplicationMgrImpl.start(ApplicationMgrImpl.java:1019)
     at com.ibm.ws.runtime.component.DeployedApplicationImpl.fireDeployedObjectStart(DeployedApplicationImpl.java:1028)
     at com.ibm.ws.runtime.component.DeployedModuleImpl.start(DeployedModuleImpl.java:538)
     at com.ibm.ws.runtime.component.DeployedApplicationImpl.start(DeployedApplicationImpl.java:724)
     at com.ibm.ws.runtime.component.ApplicationMgrImpl.startApplication(ApplicationMgrImpl.java:683)
     at com.ibm.ws.runtime.component.ApplicationMgrImpl$AppInitializer.run(ApplicationMgrImpl.java:1678)
     at com.ibm.ws.runtime.component.ComponentImpl$_AsynchInitializer.run(ComponentImpl.java:304)
     at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1332)

Hi,
you will have to compile the application with JDK 1.4 in this case. This should work for JSF and ADF Faces.
Frank

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[04:05:24 PM] [Deployer:149034]An exception occurred for task [Deployer:149026]deploy application initiatorUI on AdminServer,BPMJMSServer,SOAJMSServer,UMSJMSServer.: Failed to load webapp: 'initiatorUI.war'.
[04:05:24 PM] Weblogic Server Exception: weblogic.application.ModuleException: Failed to load webapp: 'initiatorUI.war'
[04:05:24 PM] Caused by: java.lang.ClassNotFoundException: oracle.adf.library.webapp.ResourceServlet
[04:05:24 PM] See server logs or server console for more details.
[04:05:24 PM] weblogic.application.ModuleException: Failed to load webapp: 'initiatorUI.war'
[04:05:24 PM] #### Deployment incomplete. ####
[04:05:24 PM] Remote deployment failed (oracle.jdevimpl.deploy.common.Jsr88RemoteDeployer)

Thanks Amjad. It worked for me as well!!
I think the reasoning behind this is: If we deploy it from the Application tab, it deploys the EAR file whereas simply right clicking the project and deploy, deploys the WAR file.

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

Java.nio package Runtime error java.lang.UnsupportedClassVersionError.

Hi
I am using nio package and create a java program for file locking (FileLocking.java).
Here is the sample
try {
file = new File("C:/acc.txt");
channel = new RandomAccessFile(file, "rw").getChannel();
     lock = channel.lock(0, Long.MAX_VALUE, true);
try {
          lock = channel.tryLock(0, Long.MAX_VALUE, true);
catch (OverlappingFileLockException e) {
return true;
using wsad 5.1 and jdk1.4 i compiled this program.
While executing i got the following runtime error..
java.lang.UnsupportedClassVersionError: FileLocking (Unsupported major.minor version 48.0)
     at java.lang.ClassLoader.defineClass0(Native Method)
     at java.lang.ClassLoader.defineClass(ClassLoader.java:703)
     at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:133)
     at java.net.URLClassLoader.defineClass(URLClassLoader.java:319)
     at java.net.URLClassLoader.access$400(URLClassLoader.java:92)
     at java.net.URLClassLoader$ClassFinder.run(URLClassLoader.java:677)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(URLClassLoader.java:238)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:516)
     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:441)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:448)
Exception in thread "main"
Even if i try to recompile it in command prompt and run, i got the same error.
please suggest me how can i overcome this problem.

UnsupportedClassVersionError means that you are trying to execute a class for a newer version of the JVM on an older version of the JVM.
Version 48.0 is for Java 1.4, so you have compiled your class with JDK 1.4.
The computer you are trying to run the class on, has an older version of Java than 1.4 - check it!
Try recompiling your source files with the "-target" switch, for example if you're running on Java 1.3, try compiling with:
javac -target 1.3 ... FileLocking.java

Java.lang.NoSuchMethodError: oracle.adf.share.perf.StateTracker.isActive()Z

I have recently upgraded from 10.1.3.1 to 10.1.3.3. The application uses form based authentication. The login worked fine in 10.1.3.1 but in the new version I get the following error when submitting the login details:
500 Internal Server Error
java.lang.NoSuchMethodError: oracle.adf.share.perf.StateTracker.isActive()Z
     at oracle.adf.view.faces.webapp.AdfFacesFilter.doFilter(AdfFacesFilter.java:94)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:17)
     at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:162)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:621)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:370)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:871)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:453)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].server.http.HttpRequestHandler.serveOneRequest(HttpRequestHandler.java:221)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].server.http.HttpRequestHandler.run(HttpRequestHandler.java:122)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].server.http.HttpRequestHandler.run(HttpRequestHandler.java:111)
     at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260)
     at oracle.oc4j.network.ServerSocketAcceptHandler.procClientSocket(ServerSocketAcceptHandler.java:239)
     at oracle.oc4j.network.ServerSocketAcceptHandler.access$700(ServerSocketAcceptHandler.java:34)
     at oracle.oc4j.network.ServerSocketAcceptHandler$AcceptHandlerHorse.run(ServerSocketAcceptHandler.java:880)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.3.0) ].util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303)
     at java.lang.Thread.run(Thread.java:595)
I have read various threads with similar errors which suggested copying new versions of adf-faces-impl.jar, jsf-impl.jar and adfshare.jar into the project lib directory. However, I have tried this after JDeveloper started and the project was upgraded and I still get the error. Do I need to make any project or file changes in addition to copying the new libraries ?
Thanks for any help
Trevor

Hi Trevor,
weird - there is another thread related to this issue:
Re: BUG 5930745
Did you use the JDeveloper 10.1.3.1 Production or Preview version (see http://blogs.oracle.com/Didier/2006/10/22#a114)
Regards,
Didier.

Server subsys tem failed. Reason: java.lang.UnsupportedClassVersionError

Hello!
Is not possible to run WebLogic 10R3 with JAVA 5?
<24/Nov/2009 10H14m GMT> <Info> <WebLogicServer> <BEA-000377> <Starting WebLogic
Server with Java HotSpot(TM) Client VM Version 1.5.0_22-b03 from Sun Microsyste
ms Inc.>
<24/Nov/2009 10H14m GMT> <Critical> <WebLogicServer> <BEA-000386> <Server subsys
tem failed. Reason: java.lang.UnsupportedClassVersionError: Bad version number i
n .class file
java.lang.UnsupportedClassVersionError: Bad version number in .class file
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:12
4)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:164)
at weblogic.kernel.FinalThreadLocalList.initialize(FinalThreadLocalList.
java:44)
at weblogic.t3.srvr.PreConfigBootService.start(PreConfigBootService.java
:70)
at weblogic.t3.srvr.ServerServicesManager.startService(ServerServicesMan
ager.java:459)
at weblogic.t3.srvr.ServerServicesManager.startInStandbyState(ServerServ
icesManager.java:164)
at weblogic.t3.srvr.T3Srvr.initializeStandby(T3Srvr.java:711)
at weblogic.t3.srvr.T3Srvr.startup(T3Srvr.java:482)
at weblogic.t3.srvr.T3Srvr.run(T3Srvr.java:440)
at weblogic.Server.main(Server.java:67)
>
<24/Nov/2009 10H14m GMT> <Notice> <WebLogicServer> <BEA-000365> <Server state ch
anged to FAILED>
<24/Nov/2009 10H14m GMT> <Error> <WebLogicServer> <BEA-000383> <A critical servi
ce failed. The server will shut itself down>
<24/Nov/2009 10H14m GMT> <Notice> <WebLogicServer> <BEA-000365> <Server state ch
anged to FORCE_SHUTTING_DOWN>
Thanks
A.

Hi there,
your concern is not without reason. But there is a way to configure NWDI to use both JDKs as required.
In the CBS-Settings
BUILD_TOOL_JDK_HOME - has to point to the JDK with the highest version. This should be the JDK 6 of your CE 7.2 I guess.
JDK_HOME_PATHS - contains aliases for the JDKs and the PATH to them. This aliases will be used in the build variant.
For example: JDK1.4_HOME=/usr/lib64/jvm/java;JDK1.5.0_HOME=/nwdi/sap_build_vm/sapjvm_5;default=/nwdi/sap_build_vm/sapjvm_5
This example tells CBS that there are 2 JDKs 1.4 and 1.5 and that the 1.5 JDK will be used by default.
When you create a track you have to set a build variant to use , in my case JDK 1.4, instead od the JDK1.5 by default.
The build variant will be:
com.sap.jdk.home_path_key = JDK1.4_HOME
This tells CBS to use the JDK1.4 as defined in JDK_HOME_PATHS for building in this track. other tracks will use the default JDK as long as the build variant is not adjusted.
So its not problem to build with different JDKs in NWD if required.
Have a good time
Jan

DPL Error: java.lang.UnsupportedClassVersionError

I was trying to use the DPL and ran into a little snag. I'm running my test code from within Eclipse with the jar file added to my class path.
I get the following error:
Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version number in .class file
     at java.lang.ClassLoader.defineClass1(Native Method)
     at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
     at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
     at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
     at java.net.URLClassLoader.access$100(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:268)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
     at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
     at WordCounter2.<init>(WordCounter2.java:60)
     at WordCounter2.getInstance(WordCounter2.java:78)
     at Test.main(Test.java:19)For reference, this is my little tester code
     private WordCounter2() throws DatabaseException {
          EnvironmentConfig envConfig = new EnvironmentConfig();
          envConfig.setAllowCreate(true);
          envConfig.setTransactional(true);
          myDbEnvironment = new Environment(new File("scratch"), envConfig);
          StoreConfig config = new StoreConfig();
          config.setAllowCreate(true);
          store = new EntityStore(myDbEnvironment,"wordCount",config);
          recordByWord = store.getPrimaryIndex(String.class, Record.class);
     }I don't think there is anything wrong with my test program. When I run it with the BDB_je Eclipse project on my classpath (instead of the .jar file built using the ant script) my program works fine.
I'm not quite sure what exaclty what might be going on here but it seems to be something todo with the ClassLoader/ClassEnhancer.
I'm guessing that somewhere in the build of PDL with the ant script the bytecode enhancer is producing 1.6 code. I've worked through a bunch of other test which didn't use the PDL and those work fine with either the .jar file or compiled by Eclipse's "built-in" build process.
To eliminate whether this problem only existed because I built the .jar myself I also tried the .jar file I downloaded in the je-3.2.42.zip file and it had the same effect.
I wanted to try doing everything at commandline and didn't actually get the built to complete but I got a little hint when doing so:
kdvolder$ javac -cp ~/Desktop/downloads/je-3.2.42/lib/je-3.2.42.jar *.java
error: cannot read: *.java
1 error
tiny:~/eclipse_workspaces/jquery/berkeley_DB/je-3.2.42 kdvolder$ cd ../../berkeley_DB_trial/src
tiny:~/eclipse_workspaces/jquery/berkeley_DB_trial/src kdvolder$ javac -cp ~/Desktop/downloads/je-3.2.42/lib/je-3.2.42.jar *.java
WordCounter.java:20: cannot access com.sleepycat.persist.model.Entity
bad class file: /Users/kdvolder/Desktop/downloads/je-3.2.42/lib/je-3.2.42.jar(com/sleepycat/persist/model/Entity.class)
class file has wrong version 50.0, should be 49.0
Please remove or make sure it appears in the correct subdirectory of the classpath.
import com.sleepycat.persist.model.Entity;
                                   ^
1 errorNow here's the kicker, there's nothing on my system Java 1.6 (Mac OS X is still stuck with 1.5 only) so where did those 1.6 .class files come from???
I'm guessing it is the PDL bytecode enhancer that generated them. That's why I get problems when running from the .jar only because that .jar has enhanced .class files (I saw that the ant build script does some class enhancing), and that's why I don't get the problem when I just build using Eclipse (because in the "plain" eclipse build there's no .class enhancement of the Entity.class has happened).
This explanation seems to fit with the facts but it's only a guess.
Would there be a way to fix this problem? If I just take out the enhancement task from the ant script will that mean not getting the benefit of class enhancement? Or do I still get it in the classloader?
Alternatively, could I rig the enhancer to not output 1.6 byte code?

Hi Kris,
We have not seen this error. There are no class format changes in Java 1.6 (from 1.5), and our enhancer doesn't change the class version. Plus, the com.sleepycat.persist.model.Entity interface is not enhanced by the build.
The biggest clue is this error:
bad class file: /Users/kdvolder/Desktop/downloads/je-3.2.42/lib/je-3.2.42.jar(com/sleepycat/persist/model/Entity.class)
class file has wrong version 50.0, should be 49.0
I'm wondering if the Java 1.4 javac is being used by accident from your path. The main difference between the DPL classes and other JE classes is that the DPL is compiled for Java 1.5 and the rest of the classes are compiled for Java 1.4.
After getting this error could you please send the output from these commands?:
java -version
javac -version
If the javac version is 1.4, that explains what's happening. I also suggest looking for Java 1.4 in your Eclipse path.
Otherwise, if it helps (although I don't know why it would) you should be able to comment out the use of the <enhancer> task in the build file, as long as you don't try any explicit enhancement yourself. We enhance our built-in proxy classes during the build only to make them compatible with enhanced application classes. I'm not saying that the class enhancer is to blame for this error, but if removing the enhancer helps, please do that as a workaround for now, and that will give us more information about the error.
--mark

Junit ,eclipse :java.lang.UnsupportedClassVersionError:

I have java 1.4.2_02,eclipse 3.2 and junit 4.3 versions. when I try to run a test case , encountring the following error can anyone explain the cause of this error
java.lang.UnsupportedClassVersionError: org/eclipse/jdt/internal/junit4/runner/JUnit4TestLoader (Unsupported major.minor version 49.0)
     at java.lang.ClassLoader.defineClass0(Native Method)
     at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
     at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
     at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
     at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
     at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
     at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
     at java.lang.Class.forName0(Native Method)
     at java.lang.Class.forName(Class.java:141)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.loadTestLoaderClass(RemoteTestRunner.java:324)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.createRawTestLoader(RemoteTestRunner.java:314)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.createLoader(RemoteTestRunner.java:309)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.defaultInit(RemoteTestRunner.java:287)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.init(RemoteTestRunner.java:210)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:195)

So how can I run junit 3.8.1 with JRE 1.4.2 and eclipse 3.1?

Getting java.lang.UnsupportedClassVersionError error

Hi all,
I have implemented a module in struts here i am logging in by using the page login.jsp it contains two textboxes whenever i click on the button the action should go to next page that is display.jsp if the values are eaqual. For this i am checking whether the entered values are available in database or not after that only the action has to move display.jsp page
in struts-config.xml file i wrote
<form-bean name="ProjLoignForm" type="om.ProjLoginFB"/>
<action input="/userlogin.jsp" name="ProjLoignForm" path="/login"
   scope="request" type="action.ProjAction" validate="true">
   <forward name="success" path="/display.jsp"/>
   <forward name="failure" path="/userlogin.jsp"/>
</action>here om and action are packages.
Please help me why it is giving a error like
java.lang.UnsupportedClassVersionError: action/ProjAction (Unsupported major.minor version 49.0Thank you in advance..

Hi,
The class requires JDK/JRE 1.5 but you are probably executing with JDK/JRE 1.4
Kaj

Exception in thread "main" java.lang.UnsupportedClassVersionError: ATMCaseS

Hi,
I received this error below when I run my very first java class file. Also, I also have Oracle 10.2.0.1 installed on my PC. Could someone advise what I need to do to fix it?
Thanks,
C:\examples\ch01\ATM>java ATMCaseStudy
Exception in thread "main" java.lang.UnsupportedClassVersionError: ATMCaseStudy
(Unsupported major.minor version 49.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:539)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:12
3)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)

Hi,
Have been having a similar problem. (With 1.6.0_14 and 1.6.0_16)
However making the single .java file into an .jar seems to fix the problem.

Java.lang.UnsupportedClassVersionError with ADF and Websphere

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