Seam and Drools Integration problems
finalspy Mar 1, 2011 11:45 AMHi,
I'm getting a strange Exception while changing some configuration in my components.xml file in order to get Seam and Drools integration. Here's the whole story :
I've been sucessfully using drools (5.0.2.BRMS 32440M) and Seam (2.2) configured in the components.xml
file through a RuleAgent as follow :
<drools:rule-agent name="myRuleAgent" url="http://localhost:8080/jboss-brms/org.drools.guvnor.Guvnor/package/myPackage/LATEST" local-cache-dir="/tmp" poll="30" /> <drools:managed-working-memory name="memory" auto-create="true" rule-base="#{myRuleAgent}" />
Despite the documentation on http://docs.jboss.org/seam/snapshot/en-US/html/drools.html doesn't mention how to link the rule-agent
with the managed-working-memory
, I guessed that passing the rule-agent name in the rule-base property should do the trick and it did.
Recently I changed the drools version for a more recent one (5.1.0.BRMS 36220), which came packaged with more security.
Thus the drools packages URL are not accessible freely anymore and I have to provide a user/passwd to get them.
1°) The rule-agent component does not expose user and password properties, but fortunately someone on the drools IRC chan suggested me to use the configurationFile attribute on the rul-agent tag as follow :
<drools:rule-agent name="sampleAgent" configurationFile="/WEB-INF/brms-demo.properties" />
and to provide a property file :
newInstance=true url=http://localhost:8080/jboss-brms/org.drools.guvnor.Guvnor/package/myPackage/LATEST localCacheDir=/tmp poll=30 name=sampleAgent basicAuthentication=enabled username=admin password=admin
So why not but :
2°) As soon as I used the configurationFile attribute on the drools:rule-agent tag , I start getting an Exception :
Exception during request processing:
Caused by javax.el.ELException with message: java.lang.ClassCastException: org.jboss.seam.drools.RuleAgent cannot be cast to org.drools.RuleBase
I also tried it on my old
sample site using drools 5.0.1 and it does the same, so I guess this is not linked to the drools engine but to the seam component configuration.
Here's the full stackTrace :
Exception during request processing:
Caused by javax.el.ELException with message: java.lang.ClassCastException: org.jboss.seam.drools.RuleAgent cannot be cast to org.drools.RuleBase
org.jboss.el.util.ReflectionUtil.invokeMethod(ReflectionUtil.java:339) org.jboss.el.util.ReflectionUtil.invokeMethod(ReflectionUtil.java:348) org.jboss.el.parser.AstPropertySuffix.invoke(AstPropertySuffix.java:58) org.jboss.el.parser.AstValue.invoke(AstValue.java:96) org.jboss.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:276) org.jboss.seam.core.Expressions$2.invoke(Expressions.java:175) org.jboss.seam.navigation.Pages.callAction(Pages.java:703) org.jboss.seam.navigation.Pages.preRender(Pages.java:331) org.jboss.seam.jsf.SeamPhaseListener.preRenderPage(SeamPhaseListener.java:561) org.jboss.seam.jsf.SeamPhaseListener.beforeRenderResponse(SeamPhaseListener.java:472) org.jboss.seam.jsf.SeamPhaseListener.beforeServletPhase(SeamPhaseListener.java:148) org.jboss.seam.jsf.SeamPhaseListener.beforePhase(SeamPhaseListener.java:118) com.sun.faces.lifecycle.Phase.handleBeforePhase(Phase.java:214) com.sun.faces.lifecycle.Phase.doPhase(Phase.java:96) com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) javax.faces.webapp.FacesServlet.service(FacesServlet.java:266) org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83) org.jboss.seam.web.IdentityFilter.doFilter(IdentityFilter.java:40) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:90) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:206) org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290) org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388) org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515) org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:56) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:60) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.web.HotDeployFilter.doFilter(HotDeployFilter.java:53) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158) org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235) org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:183) org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433) org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:95) org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126) org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70) org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158) org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330) org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829) org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598) org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:451) java.lang.Thread.run(Thread.java:619)
Caused by java.lang.ClassCastException with message: org.jboss.seam.drools.RuleAgent cannot be cast to org.drools.RuleBase
org.jboss.seam.drools.ManagedWorkingMemory.getRuleBaseFromValueBinding(ManagedWorkingMemory.java:125) org.jboss.seam.drools.ManagedWorkingMemory.getStatefulSession(ManagedWorkingMemory.java:76) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) java.lang.reflect.Method.invoke(Method.java:597) org.jboss.seam.util.Reflections.invoke(Reflections.java:22) org.jboss.seam.util.Reflections.invokeAndWrap(Reflections.java:144) org.jboss.seam.Component.callComponentMethod(Component.java:2275) org.jboss.seam.Component.unwrap(Component.java:2301) org.jboss.seam.Component.getInstance(Component.java:2044) org.jboss.seam.Component.getInstance(Component.java:1986) org.jboss.seam.Component.getInstance(Component.java:1980) org.jboss.seam.Component.getInstanceInAllNamespaces(Component.java:2375) org.jboss.seam.Component.getValueToInject(Component.java:2327) org.jboss.seam.Component.injectAttributes(Component.java:1739) org.jboss.seam.Component.inject(Component.java:1557) org.jboss.seam.core.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:61) org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:44) org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107) org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:185) org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:103) com.spb.sample.seamdrools.action.TestAction3_$$_javassist_seam_3.testAction(TestAction3_$$_javassist_seam_3.java) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) java.lang.reflect.Method.invoke(Method.java:597) org.jboss.el.util.ReflectionUtil.invokeMethod(ReflectionUtil.java:335) org.jboss.el.util.ReflectionUtil.invokeMethod(ReflectionUtil.java:348) org.jboss.el.parser.AstPropertySuffix.invoke(AstPropertySuffix.java:58) org.jboss.el.parser.AstValue.invoke(AstValue.java:96) org.jboss.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:276) org.jboss.seam.core.Expressions$2.invoke(Expressions.java:175) org.jboss.seam.navigation.Pages.callAction(Pages.java:703) org.jboss.seam.navigation.Pages.preRender(Pages.java:331) org.jboss.seam.jsf.SeamPhaseListener.preRenderPage(SeamPhaseListener.java:561) org.jboss.seam.jsf.SeamPhaseListener.beforeRenderResponse(SeamPhaseListener.java:472) org.jboss.seam.jsf.SeamPhaseListener.beforeServletPhase(SeamPhaseListener.java:148) org.jboss.seam.jsf.SeamPhaseListener.beforePhase(SeamPhaseListener.java:118) com.sun.faces.lifecycle.Phase.handleBeforePhase(Phase.java:214) com.sun.faces.lifecycle.Phase.doPhase(Phase.java:96) com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) javax.faces.webapp.FacesServlet.service(FacesServlet.java:266) org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83) org.jboss.seam.web.IdentityFilter.doFilter(IdentityFilter.java:40) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:90) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:206) org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290) org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388) org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515) org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:56) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:60) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.web.HotDeployFilter.doFilter(HotDeployFilter.java:53) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158) org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235) org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:183) org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433) org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:95) org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126) org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70) org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158) org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330) org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829) org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598) org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:451) java.lang.Thread.run(Thread.java:619)
I investigate a little and found that the org.jboss.seam.drools.RuleAgent class has the following @Unwrap annotation :
@Unwrap public org.drools.RuleBase getRuleBase() { return agent.getRuleBase(); }
Shouldn't the ruleAgent return a ruleBase then ?
If someone has already face this problem, knows a turnaround or is clever enough to diagnosticate an error on my configuration, or a real bug in Seam, please let me know.
Regards,
Yann