All I was trying to upgrade my application to use the latest 4.0.2
release but I seem to be getting errors
when my application is calling

import org.drools.compiler.DroolsParserException;
import org.drools.compiler.PackageBuilder;

import org.drools.rule.Package ;
import org.drools.rule.Rule;

PackageBuilder builder = new PackageBuilder();new PackageBuilder();

here is the error thrown:

java.lang.IncompatibleClassChangeError: Implementing class
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
        at org.apache.catalina.loader.WebappClassLoader.findClassInternal (WebappClassLoader.java:1817)
        at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:872)
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1325)
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
        at org.drools.rule.builder.dialect.mvel.MVELDialect .<init>(MVELDialect.java:78)
        at org.drools.rule.builder.dialect.mvel.MVELDialectConfiguration.getDialect(MVELDialectConfiguration.java:26)
        at org.drools.compiler.PackageBuilderConfiguration.buildDialectRegistry (PackageBuilderConfiguration.java:166)
        at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:142)
        at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:86)
        at com.thomcomp.generate.action.RulesReader.readPackage(RulesReader.java:25)
        at com.thomcomp.generate.action.RulesReader.getRules(RulesReader.java:55)
        at com.thomcomp.generate.action.GetRulesDef.execute (GetRulesDef.java:47)
        at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
        at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
        at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
        at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java :690)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter (ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java :175)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
        at org.apache.catalina.core.StandardEngineValve.invoke (StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
        at java.lang.Thread.run(Thread.java :595)


Did I miss something I can't seem to figure out where to start
looking. some advise would be appreciated.

running under tomcat 6 with  jdk1.5.0_09
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