Usually, a NoClassDefFoundError will have a message, which specifies the
missing class, before the stack trace like...
Exception in thread "main" java.lang.NoClassDefFoundError:
com/somepackage/SomeClass
Without it, it's a lot harder to figure out what is missing. Does Jdev
have a log file that you could look at to try to find out which class is
missing? Otherwise, you can try a shotgun approach. Locate all your jar
files in your Jdev installation (find /jdevinstalldir -name *.jar) and make
sure that they are all in your classpath.
Check the script that starts the IDE and see if it is setting a classpath.
Sometimes the CP is set using a command line option of the java command
(i.e. something like: java -cp {classpath} com.oracle.IDEStartup). Make
sure all the jar files that the script expects to find actually exist.
The Eclipse error message is a little more descriptive. It's looking for a
native library (as opposed to a Java class file) and it's telling you
exactly which one it is looking for
"/usr/local/eclipse/plugins/org.eclipse.swt.gtk64_3.0.1/os/linux/amd64/libsw
t-pi-gtk-3063.so"
-Jason
-----Original Message-----
From: fedora-list-bounces@xxxxxxxxxx [mailto:fedora-list-bounces@xxxxxxxxxx]
On Behalf Of Cyrus Adkisson
Sent: Monday, November 15, 2004 1:22 PM
To: For users of Fedora Core releases
Subject: Re: NoClassDefFoundError after upgrade to FC3
Thanks for the reply. That's the whole error as far as jdev is concerned.
When I try to run eclipse I get the following error, which may or may not be
related:
java.lang.UnsatisfiedLinkError:
/usr/local/eclipse/plugins/org.eclipse.swt.gtk64_3.0.1/os/linux/amd64/libswt
-pi-gtk-3063.so:
/usr/local/eclipse/plugins/org.eclipse.swt.gtk64_3.0.1/os/linux/amd64/libswt
-pi-gtk-3063.so:
cannot open shared object file: No such file or directory
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1586)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1495)
at java.lang.Runtime.loadLibrary0(Runtime.java:788)
at java.lang.System.loadLibrary(System.java:834)
at org.eclipse.swt.internal.Library.loadLibrary(Library.java:100)
at org.eclipse.swt.internal.gtk.OS.<clinit>(OS.java:19)
at org.eclipse.swt.internal.Converter.wcsToMbcs(Converter.java:63)
at org.eclipse.swt.internal.Converter.wcsToMbcs(Converter.java:54)
at org.eclipse.swt.widgets.Display.<clinit>(Display.java:118)
at
org.eclipse.ui.internal.Workbench.createDisplay(Workbench.java:268)
at org.eclipse.ui.PlatformUI.createDisplay(PlatformUI.java:153)
at
org.eclipse.ui.internal.ide.IDEApplication.createDisplay(IDEApplication.java
:122)
at
org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:72)
at
org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.
java:335)
at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:273)
at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:129)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39
)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.eclipse.core.launcher.Main.basicRun(Main.java:185)
at org.eclipse.core.launcher.Main.run(Main.java:704)
at org.eclipse.core.launcher.Main.main(Main.java:688)
Also, I just upgraded my java rpm (and set JAVA_HOME to the new location),
so I know all the files are there. It must be a jar file that isn't in the
classpath. What jar files would normally be in the CLASSPATH?
Cyrus
Cortezzo, Jason wrote:
>Are you giving us the entire exception message? It should tell you
>which class it is looking for. I think it usually prints right before
>the stack trace.
>
>A NoClassDefFoundError means either a .jar file is missing or your
>CLASSPATH enviornment no longer contains the necessary file.
>
>-Jason
>
>-----Original Message-----
>From: fedora-list-bounces@xxxxxxxxxx
>[mailto:fedora-list-bounces@xxxxxxxxxx]
>On Behalf Of Cyrus Adkisson
>Sent: Monday, November 15, 2004 1:10 PM
>To: For users of Fedora Core releases
>Subject: Re: NoClassDefFoundError after upgrade to FC3
>
>Well, I uncovered one big clue. Whenever you upgrade to FC3, the system
>attempts to install gcc-java (and does) which can screw up the workings
>of your Sun java considerably. Among other things, FC3 installs a
>/usr/bin/java script that points to the gcc-java code so when you type
>java -version it gives you a bunch of gcc output. If you disable the
>/usr/bin/java script, then it will revert back to the Sun java.
>
>However, doing that did not fix my problem. Jdeveloper still gives the
>same error I posted previously, as if it's searching for something in
>the classpath. Eclipse does something similar. Can anyone help me
>understand what I might need in the classpath for this to work again?
>
>Cyrus
>
>Cyrus Adkisson wrote:
>
>
>
>>Hi everybody. I use jDeveloper from Oracle to program, create GUIs and
>>manage my various projects. It's not open-source, but it's a very good
>>program. I have been using it without errors for at least a year.
>>Then, when I upgraded to Fedora Core 3, it was the only thing on my
>>computer that stopped working. When I click on the icon on my desktop,
>>nothing pops up, and top shows a massive load on the CPU for "jdev".
>>When I run it in a terminal window, I get the following error:
>>
>>java.lang.NoClassDefFoundError
>> at java.lang.Class.forName0(Native Method)
>> at java.lang.Class.forName(Class.java:141)
>> at oracle.ide.IdeCore.class$(IdeCore.java:89)
>> at oracle.ide.IdeCore.startupImpl(IdeCore.java:775)
>> at oracle.ide.Ide.startup(Ide.java:539)
>> at oracle.jdeveloper.JDeveloper.launch(JDeveloper.java:58)
>> at oracle.jdeveloper.JDeveloper.main(JDeveloper.java:37)
>>
>>I've got the same java SDK I had before, and the configuration files
>>are pointing to it. Can anybody think of why an upgrade to Fedora Core
>>3 would be causing this error?
>>
>>Thanks,
>>Cyrus
>>
>>
>>
>
>
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>
>
>
--
__________________
Cyrus Adkisson
RooseveltMedia.com
1833 New Hampshire Avenue NW
Washington, DC 20009
(202)465-4359
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