[jboss-jira] [JBoss JIRA] Commented: (JBRULES-1212) Rete throws NoClassDefFoundError when asserting facts with classess loaded by inaccessible classloader.

[Mark Proctor (JIRA)]

    [ http://jira.jboss.com/jira/browse/JBRULES-1212?page=comments#action_12378212 ] 
            
Mark Proctor commented on JBRULES-1212:
---------------------------------------

        private Class loadOrGenerateProxy(Class clazz,
                                          Rete rete) {
            Class shadowClass = null;
            final String shadowProxyName = ShadowProxyFactory.getProxyClassNameForClass( clazz );
            try {
                // if already loaded
                shadowClass = rete.getRuleBase().getMapBackedClassLoader().loadClass( shadowProxyName );
            } catch ( final Throwable e ) {
                // swallow this as we want to catch a number of exceptions and then attempt
                // again in the following line, if shadowClass still isn't assigned.
            }
 
            if ( shadowClass == null ) {
                // otherwise, create and load
                final byte[] proxyBytes = ShadowProxyFactory.getProxyBytes( clazz );
                if ( proxyBytes != null ) {
                    rete.getRuleBase().getMapBackedClassLoader().addClass( shadowProxyName,
                                                                           proxyBytes );
                    try {
                        shadowClass = rete.getRuleBase().getMapBackedClassLoader().loadClass( shadowProxyName );
                    } catch ( Throwable e ) {
                        throw new RuntimeException( "Unable to find or generate the ShadowProxy implementation for '" + clazz + "'", e);
                    }
                }
            }
 
            return shadowClass;
        }

> Rete throws NoClassDefFoundError when asserting facts with classess loaded by inaccessible classloader. 
> --------------------------------------------------------------------------------------------------------
>
>                 Key: JBRULES-1212
>                 URL: http://jira.jboss.com/jira/browse/JBRULES-1212
>             Project: JBoss Rules
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: Reteoo
>    Affects Versions: 4.0.1
>            Reporter: Alexander Gavrilov
>         Assigned To: Mark Proctor
>         Attachments: ReteShadowProxyTest.java
>
>
> We using drools as part of security enfocement engine in our application, based on Tapestry4 framework. Tapestry4 pages and components is abstract classes with some abstract methods, for which tapestry generates implementation at runtime. For example, if i declare page 
> public abstract SomePage extends BasePage  {
> }
> Tapestry will generate class in default package like 
> public SomePage$_0 extends BasePage  {
> }
> On page loading whe using instantiated page objects ans Drools Facts to ensure, that current user has permissions to load this page. In the previos verions we used (3.0.6) all worked fine. After update to version 4.0.1 whe got the NoClassDefFoundError  when triyng to assert Page object into working memory. 
> This is becouse tapestry creates classes for pages in private classloader, which is child of the application classloader. When Drools tries to generate shadowing proxy for generated Page class it generate code like 
> public class SomePage$_0ShadowProxy extends SomePage$_0 {
> }
> Later, when it tries to load this class with MapBackedClassLoader, it can not find definition for class SomePage$_0 and throws NoClassDefFoundError. This type of error does not handled correctly by drools. 

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