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Problem of Classloader in Eclipse Plugin Developemt. [message #331579]

Fri, 12 September 2008 06:59

Ashish Naidu

Messages: 6
Registered: July 2009

Junior Member

I am trying to use Tomcat 5.5.7 in Eclipse 3.0 plugin development
environment.I created a plugins jar and put into plugins directory of
Eclipse 3.0 and started the eclipse 3.0.
when I clicked run button it gives me this exception.But this class
"LogFactory" is already present in commons-logging-api.jar.
I guess at runtime classloader could not able to load this particular jar
file.I tried with all scenarios by mentioning in Manifest.mf file as well
as in plugin.xml under tag <runtime>.
But it give the same exception.
Please help me out and your solution will be appreciated.

java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
at
org.apache.catalina.core.StandardService.<clinit>(StandardService.java:53)
at
com.selectica.mbeclipse.utils.StartTomcat.startTomcat(StartT omcat.java:52)
at
com.selectica.mbeclipse.utils.StartTomcat.getInstance(StartT omcat.java:22)
at
com.selectica.mbeclipse.actions.CxRunKBAction.startNewDefaul tGUI(CxRunKBAction.java:539)
at
com.selectica.mbeclipse.actions.CxRunKBAction.runKbHTMLDefau ltGui(CxRunKBAction.java:360)
at
com.selectica.mbeclipse.actions.CxRunKBAction.clickedOk(CxRu nKBAction.java:637)
at
com.selectica.mbeclipse.actions.CxRunKBAction.getDefGUIPrefs (CxRunKBAction.java:233)
at
com.selectica.mbeclipse.actions.CxRunKBAction.runInSameThrea d(CxRunKBAction.java:442)
at
com.selectica.mbeclipse.actions.CxRunKBAction.run(CxRunKBAct ion.java:173)
at
com.selectica.mbeclipse.actions.CxRunKBAction.run(CxRunKBAct ion.java:148)
at
org.eclipse.ui.internal.PluginAction.runWithEvent(PluginActi on.java:246)
at
org.eclipse.ui.internal.WWinPluginAction.runWithEvent(WWinPl uginAction.java:223)
at
org.eclipse.jface.action.ActionContributionItem.handleWidget Selection(ActionContributionItem.java:538)
at
org.eclipse.jface.action.ActionContributionItem.access$2(Act ionContributionItem.java:488)
at
org.eclipse.jface.action.ActionContributionItem$6.handleEven t(ActionContributionItem.java:441)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java (Compiled
Code))
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:843)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.ja va:3080)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java :2713)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.jav a:1699)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1663)
at
org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Work bench.java:367)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.j ava:143)
at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplicatio n.java:103)
at
org.eclipse.core.internal.runtime.PlatformActivator$1.run(Pl atformActivator.java:226)
at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseS tarter.java:376)
at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseS tarter.java:163)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAcce ssorImpl.java:85)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAcce ssorImpl.java:58)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMe thodAccessorImpl.java:60)
at java.lang.reflect.Method.invoke(Method.java:391)
at org.eclipse.core.launcher.Main.invokeFramework(Main.java:334 )
at org.eclipse.core.launcher.Main.basicRun(Main.java:278)
at org.eclipse.core.launcher.Main.run(Main.java:973)
at org.eclipse.core.launcher.Main.main(Main.java:948)

Thanks,
Ashish.Naidu

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Re: Problem of Classloader in Eclipse Plugin Developemt. [message #331631 is a reply to message #331579]

Mon, 15 September 2008 05:16

Walter Harley

Messages: 847
Registered: July 2009

Senior Member

"Ashish Naidu" <ashish.naidu15@gmail.com> wrote in message
news:bc22d4e17acabe461c50d3781938bd04$1@www.eclipse.org...
>I am trying to use Tomcat 5.5.7 in Eclipse 3.0 plugin development
>environment.

I think you may have problems getting much support for Eclipse 3.0, which
came out in 2004. Honestly I doubt at this point many folks still remember
what issues or limitations may have existed. Eclipse 3.4 shipped this June,
and we are hard at work on 3.5... there have been a lot of changes and
improvements.

Is there a reason you're limited to using 3.0? (E.g., maybe you are
restricted to using a very old VM version, which in turn is missing some
libraries?) That will probably be important information for anyone to help
you.

Have you tried searching Bugzilla to see if this is a known (and by now
perhaps fixed) bug?

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Re: Problem of Classloader in Eclipse Plugin Developemt. [message #331638 is a reply to message #331631]

Mon, 15 September 2008 12:08

Ashish Naidu

Messages: 6
Registered: July 2009

Junior Member

Hi Walter,

Thanks for the reply.I got solution for this.

I added bootstrap.jar and commons-logging-api.jar to the classpath which
was missing.

Thanks,
Ashish Naidu

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