[rules-users] Eclipse, Groovy and Drools - java.lang.NoClassDefFoundError

[sweeneymj]

Hi, 

I have just started trying out Drools and having an issue trying to run the
sample applications under Eclipse Helios with Groovy installed. 

When I try run any sample Drools application I get the stack trace shown
below. I have looked around extensively on Google for assistance but have
been unable to find any thing that has helped me determine what the issue
is. 

Any suggestions would be appreciated.

Regards 

-- 

Build groovy files option has not been set one way or the other: use
'options.put(CompilerOptions.OPTIONG_BuildGroovyFiles,
CompilerOptions.ENABLED);' 
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:737) 
        at
org.eclipse.jdt.internal.compiler.Compiler.<init>(Compiler.java:294) 
        at
org.eclipse.jdt.internal.compiler.Compiler.<init>(Compiler.java:159) 
        at
org.drools.commons.jci.compilers.EclipseJavaCompiler.compile(EclipseJavaCompiler.java:364) 
        at
org.drools.commons.jci.compilers.AbstractJavaCompiler.compile(AbstractJavaCompiler.java:51) 
        at
org.drools.rule.builder.dialect.java.JavaDialect.compileAll(JavaDialect.java:366) 
        at
org.drools.compiler.DialectCompiletimeRegistry.compileAll(DialectCompiletimeRegistry.java:55) 
        at
org.drools.compiler.PackageRegistry.compileAll(PackageRegistry.java:69) 
        at
org.drools.compiler.PackageBuilder.compileAll(PackageBuilder.java:674) 
        at
org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:633) 
        at
org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:278) 
        at
org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:451) 
        at
org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:28) 
        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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