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Re: [platform-ui-dev] PDE: NoClassDefFoundError 
Hi Timo!
You're right, this isn't the right place to ask this kind of question. The mailinglists are intended mainly for those who develop Eclipse and questions like this are better asked in one of the newsgroups. They're followed by far more people and questions like 
this will thus be answered much faster.
Anyway, it looks like your plugin.xml is missing the reference to the org.eclipse.swt plugin. To fix this, open the plugin.xml with the 'Plug-in Manifest Editor' and switch to the dependecies tab. Add 'org.eclipse.swt' to the list of required plugins. This'll 
fix that problem but I guess there will be more missing requirements.
The plugin.xml lists the runtime requirements of your plugin (and several other things) while the classpath only lists the compile-time requirements. In general, it's a much better idea to make changes to the plugin.xml, then using "Update Classpath" (on 
plugin.xml's context menu) to update the classpath accordingly.

Cheers,
Boris

On Montag, Oktober 13, 2003, at 06:32  Uhr, Timo Nentwig wrote:


Hi!
I'm not quite sure whether this is the right place to post but there aren't 
any other :-)

So, I tried to write a plugin for the first time, switched to the PDE
perspective and create a sample view plugin using the wizard. Unfortunately I cannot run it as run-time workbench. This is quite strange since the required JAR is in class path and also the editor does not complain about anything.
So what's going wrong here? I did nothing, everything was done by the wizard, 
I just clicked next...


java.lang.NoClassDefFoundError: org/eclipse/swt/widgets/Dialog
        at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:1610) 
        at java.lang.Class.getConstructor0(Class.java:1922)
        at java.lang.Class.newInstance0(Class.java:278)
        at java.lang.Class.newInstance(Class.java:261)
        at
org.eclipse.core.internal.plugins.PluginDescriptor.createExecutableExte nsion(PluginDescriptor.java:138) 
        at
org.eclipse.core.internal.plugins.PluginDescriptor.createExecutableExte nsion(PluginDescriptor.java:167) 
        at
org.eclipse.core.internal.plugins.ConfigurationElement.createExecutable Extension(ConfigurationElement.java:103) 
        at
org.eclipse.core.internal.runtime.InternalPlatform.loaderGetRunnable(In ternalPlatform.java:584) 
        at
org.eclipse.core.internal.runtime.InternalPlatform.checkVersionPrompt(I nternalPlatform.java:508) 
        at
org.eclipse.core.internal.runtime.InternalPlatform.loaderCheckVersion(I nternalPlatform.java:484) 
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.ja va:39) 
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccesso rImpl.java:25) 
        at java.lang.reflect.Method.invoke(Method.java:324)
        at
org.eclipse.core.internal.boot.InternalBootLoader.checkVersion(Internal BootLoader.java:873) 
        at
org.eclipse.core.internal.boot.InternalBootLoader.run(InternalBootLoade r.java:842) 
        at org.eclipse.core.boot.BootLoader.run(BootLoader.java:461)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.ja va:39) 
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccesso rImpl.java:25) 
        at java.lang.reflect.Method.invoke(Method.java:324)
        at org.eclipse.core.launcher.Main.basicRun(Main.java:295)
        at org.eclipse.core.launcher.Main.run(Main.java:751)
        at org.eclipse.core.launcher.Main.main(Main.java:587)

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people built perfectly good brick walls long before they knew why
cement works." - Alan Cox

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