Hello, I have a problem using execution server. It sends a NoClassDefFoundError. I search for hours, but find nothing... Why I have done, in guvnor: I have created : -- a package "com.myorg.myapp" ---- a declarative model "Model1" ------ with a fact "Fact1" -------- with a text field "field1" -------- with an integer field "field2" ---- a Business Rule "rule1" ------ which test for the "field1" value, and set the "field2" to a dummy value. I then created a snapshot called 'release' I created a myappAgent.properties with the following values: name=mrgAgent newInstance=true url= http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/com.... poll=60 I put the file in drools-server classes directory I then tried to call execution server using CURL: curl --data "<knowledgebase-request>< inOutFacts><named-fact><id>Fact1</id><fact class='com.myorg.myapp.Fact1'><field1>Any response?</field1></fact></named-fact></inOutFacts></knowledgebase-request>" http://localhost:8080/drools-server/knowledgebase/myappAgent And the server (drools-server I assume, not guvnor ?), send me this response: ... ling this request.</u></p><p><b>exception</b> <pre>javax.servlet.ServletException: Servlet execution threw an exception org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) </pre></p><p><b>root cause</b> <pre>java.lang.NoClassDefFoundError: com/myorg/myapp/Fact1 ASMAccessorImpl_87013581264610722640.getValue(Unknown Source) org.mvel2.optimizers.dynamic.DynamicGetAccessor.getValue(DynamicGetAccessor.java:66) org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:99) org.mvel2.MVELRuntime.execute(MVELRuntime.java:85) org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:107) org.mvel2.MVEL.executeExpression(MVEL.java:978) org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:87) org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:934) org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:885) org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1086) org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:660) org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:637) org.drools.reteoo.ReteooStatelessSession.execute(ReteooStatelessSession.java:203) org.drools.server.KnowledgeStatelessServlet.doService(KnowledgeStatelessServlet.java:152) org.drools.server.KnowledgeStatelessServlet.doPost(KnowledgeStatelessServlet.java:82) javax.servlet.http.HttpServlet.service(HttpServlet.java:710) javax.servlet.http.HttpServlet.service(HttpServlet.java:803) org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) What have I done wrong ??? Please ,help me !!! Regards, Régis Ramillien