Edson Tirelli wrote:
Forgot to say that we are doing an effort to completely remove
shadow proxies in the next major version.
Yes i have a branch now that does not need shadow proxies at all. We
will probably recommend an AOP approach for those that need integrity
protection in a multi-threaded environment.
2008/2/19, Edson Tirelli <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>:
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 <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>:
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
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--
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>
------------------------------------------------------------------------
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