topic Re: Custom ClassLoader failing with BeanInfo & BeanCustomizer for ProcessParam in Alfresco Archive

Custom ClassLoader failing with BeanInfo & BeanCustomizer for ProcessParam

zoikks1 — Fri, 27 Feb 2015 20:10:16 GMT

Good afternoon,I have built a framework for running workflows that uses Activiti 5.16.3, MySql 5.6. The framework is written using EJB 3.1 technology and executes on WebLogic 12.1.1. Although this is an EJB project, I have used Spring to inject the ProcessEngine into the base EJBs.My framework is

Re: Custom ClassLoader failing with BeanInfo & BeanCustomizer for ProcessParam

jbarrez — Sat, 28 Feb 2015 10:09:36 GMT

Not sure where the code is you are talking about. What class are we talking about there? The code doesn't ring a bell for me … but that doesn't mean a thing

Re: Custom ClassLoader failing with BeanInfo & BeanCustomizer for ProcessParam

zoikks1 — Mon, 02 Mar 2015 01:29:29 GMT

The following is the stacktrace. From this stacktrace, pinpointing what code is being called should be self-evident.

        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:274)
        at com.sun.beans.finder.ClassFinder.findClass(ClassFinder.java:103)
        at com.sun.beans.finder.InstanceFinder.instantiate(InstanceFinder.java:93)
        at com.sun.beans.finder.InstanceFinder.find(InstanceFinder.java:66)
        at java.beans.Introspector.findExplicitBeanInfo(Introspector.java:438)
        at java.beans.Introspector.<init>(Introspector.java:388)
        at java.beans.Introspector.getBeanInfo(Introspector.java:163)
        at org.activiti.engine.impl.javax.el.BeanELResolver$BeanProperties.<init>(BeanELResolver.java:54)
        at org.activiti.engine.impl.javax.el.BeanELResolver.toBeanProperty(BeanELResolver.java:619)
        at org.activiti.engine.impl.javax.el.BeanELResolver.getValue(BeanELResolver.java:298)
        at org.activiti.engine.impl.javax.el.CompositeELResolver.getValue(CompositeELResolver.java:231)
        at org.activiti.engine.impl.juel.AstProperty.eval(AstProperty.java:61)
        at org.activiti.engine.impl.juel.AstBinary$SimpleOperator.eval(AstBinary.java:27)
        at org.activiti.engine.impl.juel.AstBinary.eval(AstBinary.java:106)
        at org.activiti.engine.impl.juel.AstEval.eval(AstEval.java:50)
        at org.activiti.engine.impl.juel.AstNode.getValue(AstNode.java:26)
        at org.activiti.engine.impl.juel.TreeValueExpression.getValue(TreeValueExpression.java:114)
        at org.activiti.engine.impl.delegate.ExpressionGetInvocation.invoke(ExpressionGetInvocation.java:33)
        at org.activiti.engine.impl.delegate.DelegateInvocation.proceed(DelegateInvocation.java:37)
        at org.activiti.engine.impl.delegate.DefaultDelegateInterceptor.handleInvocation(DefaultDelegateInterc
eptor.java:25)
        at org.activiti.engine.impl.el.JuelExpression.getValue(JuelExpression.java:48)
        at org.activiti.engine.impl.el.UelExpressionCondition.evaluate(UelExpressionCondition.java:37)
        at org.activiti.engine.impl.bpmn.behavior.ExclusiveGatewayActivityBehavior.leave(ExclusiveGatewayActiv
ityBehavior.java:63)
        at org.activiti.engine.impl.bpmn.behavior.FlowNodeActivityBehavior.execute(FlowNodeActivityBehavior.ja
va:36)

It is within this code that the org.zoikks.MyObjectBeanInfo is being generated and the custom classloader is unable to find it.

Please let me know if you would like additional information.

Thanks,

- Joe

Re: Custom ClassLoader failing with BeanInfo & BeanCustomizer for ProcessParam

jbarrez — Mon, 02 Mar 2015 10:28:09 GMT

I'm not following here .. the at java.beans.Introspector.getBeanInfo(Introspector.java:163) is clearly a JDK code. It gets called in the stacktrace when executing a custom expression in Activiti.

Re: Custom ClassLoader failing with BeanInfo & BeanCustomizer for ProcessParam

zoikks1 — Mon, 02 Mar 2015 16:15:39 GMT

Back to the original questions…

1 - What is the purpose of the Introspector call to begin with (in relation to the Activiti functionality)? Is there a way to disable this?

2 - Is there a way to point the Introspector to a different classloader or include the generated BeanInfos in my own classloader?

Thanks.

- Joe

Re: Custom ClassLoader failing with BeanInfo & BeanCustomizer for ProcessParam

jbarrez — Tue, 03 Mar 2015 17:18:10 GMT

1. No, this is totally not Activiti, but JDK. It is a class in the JDK used when a new instance of a class needs to be created. We cannot circumvent that
2. I would hope the JDK classes are smart enough to know about your custom classloader … I have not enough classloader knowledge (they ALWAYS bite you back) to know what is actually going on here :s