[jboss-jira] [JBoss JIRA] Commented: (JBRULES-557) Dynamically generated classes not accessed by drools classloader

[Edson Tirelli (JIRA)]

    [ http://jira.jboss.com/jira/browse/JBRULES-557?page=comments#action_12347726 ] 
            
Edson Tirelli commented on JBRULES-557:
---------------------------------------

Commited fix into 3.0.x branch in revision #7856:

Sending        drools-core/src/main/java/org/drools/rule/PackageCompilationData.java
Sending        drools-core/src/main/java/org/drools/util/asm/ClassFieldInspector.java
Transmitting file data ..
Committed revision 7856.

Commited into trunk in revision #7857:

Sending        drools-core/src/main/java/org/drools/rule/PackageCompilationData.java
Sending        drools-core/src/main/java/org/drools/util/asm/ClassFieldInspector.java
Transmitting file data ..
Committed revision 7857.

Although, I must warn that it will be easy to make it work with JANINO, but if you are using JDT as the compiler, you will need to implement a special classloader for your dynamically generated classes. This classloader must be able to provide the classes bytecode for the classes it handles, as JDT requires the actual bytecodes to compile the rules. So, to be short, your classloader must implement the method:

        public InputStream getResourceAsStream(final String name) {
                if( name is a dynamically generated class )
                    return <bytecode for the given dynamically generated class>
                else
                    return super.getResourceAsStream( name );
        }


I have a sample code that works and will provide instructions later on how to do it. Need to clean it up first.



> Dynamically generated classes not accessed by drools classloader
> ----------------------------------------------------------------
>
>                 Key: JBRULES-557
>                 URL: http://jira.jboss.com/jira/browse/JBRULES-557
>             Project: JBoss Rules
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: Drl Parser/Builder
>    Affects Versions: 3.0.4
>            Reporter: Jeff DeLong
>         Assigned To: Edson Tirelli
>             Fix For: 3.0.5
>
>
> Class generation example required generated classes to be written to files system in order to be accessed by the drools classloader. Believe this was not a requirement in previous releases.

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