[rules-users] "NoClassDefFoundError: org/eclipse/core/runtime/Plugin" in fresh Drools IDE install

[eoliphan]

Hi, I've created a new Drools dev setup with the latest version of the IDE
(problem exists in Helios also), but having an issue running projects.  Have
stripped this down, and the problem exists even with a brand new project
created with the Drools wizard.  When running even the base DroolsTest in a
default project I get the following error. 

Any ideas?

---

java.lang.NoClassDefFoundError: org/eclipse/core/runtime/Plugin
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
	at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
	at
org.eclipse.jdt.internal.compiler.Compiler.initializeParser(Compiler.java:741)
	at org.eclipse.jdt.internal.compiler.Compiler.<init>(Compiler.java:295)
	at org.eclipse.jdt.internal.compiler.Compiler.<init>(Compiler.java:161)
	at
org.drools.commons.jci.compilers.EclipseJavaCompiler.compile(EclipseJavaCompiler.java:356)
	at
org.drools.commons.jci.compilers.AbstractJavaCompiler.compile(AbstractJavaCompiler.java:49)
	at
org.drools.rule.builder.dialect.java.JavaDialect.compileAll(JavaDialect.java:368)
	at
org.drools.compiler.DialectCompiletimeRegistry.compileAll(DialectCompiletimeRegistry.java:53)
	at org.drools.compiler.PackageRegistry.compileAll(PackageRegistry.java:70)
	at org.drools.compiler.PackageBuilder.compileAll(PackageBuilder.java:844)
	at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:801)
	at
org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:385)
	at
org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:563)
	at
org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:35)
	at com.sample.DroolsTest.readKnowledgeBase(DroolsTest.java:40)
	at com.sample.DroolsTest.main(DroolsTest.java:23)
Caused by: java.lang.ClassNotFoundException: org.eclipse.core.runtime.Plugin
	at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
	... 27 more
--

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