Re: [rules-users] IllegalAccessError in shadow classes

Forgot to say that we are doing an effort to completely remove shadow proxies in the next major version.

2008/2/19, Edson Tirelli <tirelli(a)post.com <mailto:tirelli@post.com>>: Drools tries to create the ShadowProxy. The reason is that it does not know about the implementation... it just knows it is a Map and as so, it must be shadowed. Problem is that SingletonMap is either final or does not have a default constructor. My recommendation, besides opening a JIRA for this, is avoid inserting collections/maps directly as facts. The semantic for such facts is not clearly defined and it may cause undesired behavior. []s Edson 2008/2/19, Godmar Back <godmar(a)gmail.com <mailto:godmar@gmail.com>>: Hi, usings Drools 4.0.4 and MVEL 1.4, this simple rule: --- package test; import java.util.Collections; dialect "mvel" rule "Rule #1" when then insert(Collections.singletonMap("content", "hello")); end -- produces: java.lang.IllegalAccessError: class org.drools.shadow.java.util.Collections$SingletonMapShadowProxy cannot access its superclass java.util.Collections$SingletonMap at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:620) at org.drools.rule.MapBackedClassLoader.fastFindClass(MapBackedClassLoader.java:60) at org.drools.rule.MapBackedClassLoader.loadClass(MapBackedClassLoader.java:79) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at org.drools.reteoo.Rete$ClassObjectTypeConf.loadOrGenerateProxy(Rete.java:547) at org.drools.reteoo.Rete$ClassObjectTypeConf.defineShadowProxyData(Rete.java:494) at org.drools.reteoo.Rete$ClassObjectTypeConf.<init>(Rete.java:461) at org.drools.reteoo.Rete.assertObject(Rete.java:152) at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:192) at org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:71) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:909) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:881) at org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:67) at org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:61) It's not clear to me why Drools creates Proxies for such classes as java.util.Collections, or does MVEL do it? - Godmar _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org> https://lists.jboss.org/mailman/listinfo/rules-users -- Edson Tirelli JBoss Drools Core Development Office: +55 11 3529-6000 Mobile: +55 11 9287-5646 JBoss, a division of Red Hat @ www.jboss.com <http://www.jboss.com> -- Edson Tirelli JBoss Drools Core Development Office: +55 11 3529-6000 Mobile: +55 11 9287-5646 JBoss, a division of Red Hat @ www.jboss.com <http://www.jboss.com> ------------------------------------------------------------------------ _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users