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Edson Tirelli wrote:
<blockquote
cite="mid:e6dd5ba30802191211g66c9e55dv8175dc9ea463b049@mail.gmail.com"
type="cite"><br>
Forgot to say that we are doing an effort to completely remove
shadow proxies in the next major version.<br>
</blockquote>
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.<br>
<blockquote
cite="mid:e6dd5ba30802191211g66c9e55dv8175dc9ea463b049@mail.gmail.com"
type="cite"><br>
<div><span class="gmail_quote">2008/2/19, Edson Tirelli <<a
moz-do-not-send="true" href="mailto:tirelli@post.com">tirelli@post.com</a>>:</span>
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>
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.<br>
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.<br>
<br>
[]s<br>
Edson<br>
<br>
<div><span class="gmail_quote">2008/2/19, Godmar Back <<a
moz-do-not-send="true" href="mailto:godmar@gmail.com" target="_blank"
onclick="return top.js.OpenExtLink(window,event,this)">godmar@gmail.com</a>>:</span>
<div><span class="e" id="q_1183352161a7fa5d_1">
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hi,<br>
<br>
usings Drools 4.0.4 and MVEL 1.4, this simple rule:<br>
---<br>
package test;<br>
<br>
import java.util.Collections;<br>
<br>
dialect "mvel"<br>
<br>
rule "Rule #1"<br>
when<br>
then<br>
insert(Collections.singletonMap("content", "hello"));<br>
end<br>
--<br>
<br>
produces:<br>
java.lang.IllegalAccessError: class<br>
org.drools.shadow.java.util.Collections$SingletonMapShadowProxy cannot<br>
access its superclass java.util.Collections$SingletonMap<br>
at java.lang.ClassLoader.defineClass1(Native Method)<br>
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)<br>
at
org.drools.rule.MapBackedClassLoader.fastFindClass(MapBackedClassLoader.java:60)<br>
at
org.drools.rule.MapBackedClassLoader.loadClass(MapBackedClassLoader.java:79)<br>
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)<br>
at
org.drools.reteoo.Rete$ClassObjectTypeConf.loadOrGenerateProxy(Rete.java:547)<br>
at
org.drools.reteoo.Rete$ClassObjectTypeConf.defineShadowProxyData(Rete.java:494)<br>
at
org.drools.reteoo.Rete$ClassObjectTypeConf.<init>(Rete.java:461)<br>
at org.drools.reteoo.Rete.assertObject(Rete.java:152)<br>
at
org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:192)<br>
at
org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:71)<br>
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:909)<br>
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:881)<br>
at
org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:67)<br>
at
org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:61)<br>
<br>
<br>
It's not clear to me why Drools creates Proxies for such classes as<br>
java.util.Collections, or does MVEL do it?<br>
<br>
- Godmar<br>
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</blockquote>
</span></div>
</div>
<span class="sg"><br>
<br clear="all">
<br>
-- <br>
Edson Tirelli<br>
JBoss Drools Core Development<br>
Office: +55 11 3529-6000<br>
Mobile: +55 11 9287-5646<br>
JBoss, a division of Red Hat @ <a moz-do-not-send="true"
href="http://www.jboss.com" target="_blank"
onclick="return top.js.OpenExtLink(window,event,this)">www.jboss.com</a>
</span></blockquote>
</div>
<br>
<br clear="all">
<br>
-- <br>
Edson Tirelli<br>
JBoss Drools Core Development<br>
Office: +55 11 3529-6000<br>
Mobile: +55 11 9287-5646<br>
JBoss, a division of Red Hat @ <a moz-do-not-send="true"
href="http://www.jboss.com">www.jboss.com</a>
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</blockquote>
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