[rules-dev] Drools on android -reply

[Mark Proctor]

On 02/01/2012 13:46, Wolfgang Laun wrote:
> On 2 January 2012 14:30, Matthew Versaggi <profversaggi at gmail.com 
> <mailto:profversaggi at gmail.com>> wrote:
>
>     Here's what I got working and when it failed .... it was just the
>     basic 'hello world' kind of stuff:
>
>     Worked:
>     final KnowledgeBuilder kbuilder =
>     KnowledgeBuilderFactory.newKnowledgeBuilder();
>
>     Died:
>     // this will parse and compile in one step
>     kbuilder.add(ResourceFactory.newClassPathResource("HelloWorld.drl", DroolsTest.class),
>     ResourceType.DRL);
>
>     LogCat:
>     01-02 13:13:17.684: E/AndroidRuntime(537):
>     java.lang.RuntimeException: Unable to start activity
>     ComponentInfo{com.versaggi.android.droolsandroidtest/com.versaggi.android.droolsandroidtest.DroolsAndroidTestActivity}:
>     java.lang.NullPointerException
>
>
> I've seen NPEs thrown up from down in the Drools gears when the DRL 
> resource could not be found. Make sure that
>    ResourceFactory.newClassPathResource("HelloWorld.drl",         
> DroolsTest.class)
>
> is != null.
>
>     I had to re-compile the CompositeClassLoader.java file and then
>     reinsert it into the drools-api-5.1.0.M2.jar file to get past this
>     issue:
>
>     "A small modification is needed in
>     org.drools.util.CompositeClassLoader. Apparently, the Android JVM
>     doesn't allow null as the parent classloader so I changed that to
>     super(CompositeClassLoader.class.getClassLoader()) in the
>     constructor, and that works fine."
>
>
> Yes, that's come up in other Java environments as well, and IIRC been 
> fixed on the way towards 5.2.0. )There ought to be a closed JIRA, if 
> s.o. cares to look it up.)
I'll check. It wasn't something I wanted committed to the main branch, 
as it has search ramifications. But it would be good to detect the 
environment and do it if it's android.

Mark
>
> -W
>
>
>
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