The NoClassDefFoundError exception is thrown from within drools code, so it's obviously in the classpath. The problem appears to be with the mechanism used by drools to load it's own code.

Jesse

On Wed, 2007-18-07 at 02:14 -0300, Fernando Meyer wrote:

You should add the drools-core library as a required dependency.

Fernando Meyer http://fmeyer.org

fmcamargo@gmail.com

PGP: 0xD804DDFB

On Jul 17, 2007, at 9:55 AM, Jesse Stockall wrote:

Tomcat 5.5
Java 1.5
jbossrules-4.0.0.12865MR3

I have an instance of Drools running inside a webapp deployed on Tomcat. The rules have been compiled ahead of time and are loaded in with:

InputStream is = PolicyRuntime.class.getResourceAsStream(name);
DroolsObjectInputStream in = new DroolsObjectInputStream(is);
Package p = (Package) in.readObject();

When run outside Tomcat it loads fine, when run inside Tomcat I get:

java.lang.NoClassDefFoundError: org/drools/base/extractors/BaseObjectClassFieldExtractor
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at org.drools.base.ClassFieldExtractorFactory$ByteArrayClassLoader.defineClass(ClassFieldExtractorFactory.java:455)
at org.drools.base.ClassFieldExtractorFactory.getClassFieldExtractor(ClassFieldExtractorFactory.java:114)
at org.drools.base.ClassFieldExtractor.init(ClassFieldExtractor.java:77)
at org.drools.base.ClassFieldExtractor.<init>(ClassFieldExtractor.java:57)
at org.drools.base.ClassFieldExtractorCache.getExtractor(ClassFieldExtractorCache.java:35)
at org.drools.base.ClassFieldExtractor.readResolve(ClassFieldExtractor.java:72)

I've tried adding DroolsObjectInputStream.class.getClassLoader() , PolicyRuntime.class.getClassLoader() and Thread.currentThread().getContextClassLoader() to the constructor of the DroolsObjectInputStream but none had any effect.

Thanks

Jesse

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