[rules-users] Guvnor - AccumulateFunction ClassCastException
Edson Tirelli
ed.tirelli at gmail.com
Mon Jul 25 13:19:02 EDT 2011
This is looking like a classloader issue. I assume your function is
correctly implementing the org.drools.runtime.rule.AccumulateFunction, as
you mention that it works outside of guvnor. So my guess is that your
function jar is being loaded by a classloader in a different hierarchy and
that is raising the CCE?
Edson
2011/7/25 Melton, Michael P CTR SPAWARSYSCEN-ATLANTIC, 01200 <
michael.melton.ctr at navy.mil>
> I am having trouble getting my rule package, which contains a reference
> to a custom accumulate function, to compile within Guvnor (5.2.0.Final on
> JBoss AS 5.1.0.GA). I have been using the same rules as DRL files without
> issue in Eclipse. I have tests which exercise the accumulate function and
> they are all passing. The error I get from Guvnor when I try to build the
> package is:
>
> Service method 'public abstract org.drools.guvnor.client.rpc.BuilderResult
> org.drools.guvnor.client.rpc.PackageService.buildPackage(java.lang.String,boolean,java.lang.String,java.lang.String,java.lang.String,boolean,java.lang.String,java.lang.String,boolean,java.lang.String)
> throws com.google.gwt.user.client.rpc.SerializationException' threw an
> unexpected exception: java.lang.ClassCastException:
> test.accumulate.BigIntegerSumAccumulateFunction cannot be cast to
> org.drools.runtime.rule.AccumulateFunction
>
> I've isolated the problem into a reproducible test, or rather a set of
> steps:
> 1. Compile the attached BigIntegerSumAccumulateFunction.java into a jar and
> copy the jar to the JBoss server's lib folder.
> 2. Start up JBoss.
> 3. Create a new package in Guvnor. I called mine "test".
> 4. Create a new fact that has a numeric property. Here's mine:
> declare Foo
> value : int
> end
> 5. Upload the attached drools.packagebuilder.conf to the Guvnor package.
> 6. Create a new rule that references the custom accumulate function:
> when
> BigInteger() from accumulate( Foo( $v : value), bigIntegerSum( $v ) )
> then
> System.out.println("test");
> 7. Try to build the binary package in Guvnor. The error listed above
> occurs. Please see the end of this email for a full stack trace.
>
> It's telling me that my custom accumulate function can't be cast to
> org.drools.runtime.rule.AccumulateFunction, but I have a unit test (also
> attached) that proves that it can. Again, I have other tests which exercise
> rules that reference the accumulate function and they compile and work fine.
>
> Any thoughts? Why does the Guvnor compiler work differently from when I
> build my knowledge base in code?
>
> Thanks in advance for any assistance.
>
> Mike Melton
>
>
> FULL STACK TRACE:
>
> java.lang.ClassCastException:
> test.accumulate.BigIntegerSumAccumulateFunction cannot be cast to
> org.drools.runtime.rule.AccumulateFunction
> at
> org.drools.compiler.PackageBuilderConfiguration.loadAccumulateFunction(PackageBuilderConfiguration.java:491)
> at
> org.drools.compiler.PackageBuilderConfiguration.buildAccumulateFunctionsMap(PackageBuilderConfiguration.java:440)
> at
> org.drools.compiler.PackageBuilderConfiguration.init(PackageBuilderConfiguration.java:177)
> at
> org.drools.compiler.PackageBuilderConfiguration.<init>(PackageBuilderConfiguration.java:148)
> at
> org.drools.guvnor.server.builder.BRMSPackageBuilder.getPackageBuilderConfiguration(BRMSPackageBuilder.java:134)
> at
> org.drools.guvnor.server.builder.BRMSPackageBuilder.<init>(BRMSPackageBuilder.java:67)
> at
> org.drools.guvnor.server.builder.AssemblerBase.createBuilder(AssemblerBase.java:46)
> at
> org.drools.guvnor.server.builder.PackageAssembler.createBuilder(PackageAssembler.java:35)
> at
> org.drools.guvnor.server.builder.AssemblerBase.<init>(AssemblerBase.java:42)
> at
> org.drools.guvnor.server.builder.PackageAssemblerBase.<init>(PackageAssemblerBase.java:44)
> at
> org.drools.guvnor.server.builder.PackageAssembler.<init>(PackageAssembler.java:49)
> at
> org.drools.guvnor.server.RepositoryPackageOperations.buildPackage(RepositoryPackageOperations.java:522)
> at
> org.drools.guvnor.server.RepositoryPackageOperations.buildPackage(RepositoryPackageOperations.java:480)
> at
> org.drools.guvnor.server.RepositoryPackageService.buildPackage(RepositoryPackageService.java:299)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at org.jboss.seam.util.Reflections.invoke(Reflections.java:22)
> at
> org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:31)
> at
> org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56)
> at
> org.jboss.seam.transaction.RollbackInterceptor.aroundInvoke(RollbackInterceptor.java:28)
> at
> org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
> at
> org.jboss.seam.core.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:77)
> at
> org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
> at
> org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:44)
> at
> org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
> at
> org.jboss.seam.security.SecurityInterceptor.aroundInvoke(SecurityInterceptor.java:157)
> at
> org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
> at
> org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107)
> at
> org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:166)
> at
> org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:102)
> at
> org.drools.guvnor.server.RepositoryPackageService_$$_javassist_7.buildPackage(RepositoryPackageService_$$_javassist_7.java)
> at
> org.drools.guvnor.server.RepositoryServiceServlet.buildPackage(RepositoryServiceServlet.java:282)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:569)
> at
> com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:208)
> at
> com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248)
> at
> com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
> at org.jboss.seam.web.ContextFilter$1.process(ContextFilter.java:42)
> at
> org.jboss.seam.servlet.ContextualHttpServletRequest.run(ContextualHttpServletRequest.java:53)
> at org.jboss.seam.web.ContextFilter.doFilter(ContextFilter.java:37)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
> at
> org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
> at
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
> at
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
> at
> org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
> at
> org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
> at
> org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
> at
> org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
> at
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
> at
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
> at
> org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
> at
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
> at
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
> at
> org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829)
> at
> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598)
> at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
> at java.lang.Thread.run(Thread.java:662)
>
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>
>
--
Edson Tirelli
JBoss Drools Core Development
JBoss by Red Hat @ www.jboss.com
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