[rules-users] NoClassDefFoundError for BaseObjectClassFieldExtractor when running in Tomcat

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