[rules-users] Eclipse, JUnit and Classpaths (sorry, back)

[J Michael Dean]

I have been unable to work on this for a while but problem has not  
gone away.  I have an RCP that runs and Drools runs and works.  But  
when I try to run unit tests that involve Drools, I get this recurrent  
problem:


java.lang.NullPointerException
	at  
org.mvel.optimizers.OptimizerFactory.<clinit>(OptimizerFactory.java:43)
	at  
org.drools.rule.builder.dialect.mvel.MVELDialect.init(MVELDialect.java: 
142)
	at org.drools.compiler.DialectRegistry.initAll(DialectRegistry.java:49)
	at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:146)
	at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:108)
	at  
droolsRules.tests.AllDroolsRulesTests.setUp(AllDroolsRulesTests.java:48)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at  
sun 
.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java: 
39)
	at  
sun 
.reflect 
.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java: 
25)
	at java.lang.reflect.Method.invoke(Method.java:585)

So I am writing to describe this environment again, and see if anyone  
has suggestions.

I have the Eclipse plugin in my development environment.  It is NOT in  
my target environment.

I have a privately minted "MinimalDroolsPlugin" that includes the  
core, compiler, and the dependency library.  THIS plugin is what is in  
my manifest.

This works when I run the application, as an RCP with product  
branding, or as a product.  When I use the target environment in  
Eclipse to create Mac, Linux, and W32 applications, all is well.

When I run JUnit tests, I get the error above.

I am wondering if the problem is the simultaneous presence of my  
minimal plugin as well as the eclipse Drools plugin?

The Drools jars that are needed by the application need to be  
incorporated into some kind of Eclipse plugin so that they are  
exposed, which is why I created the minimal plugin.  But if I leave  
this out completely and then try to setup a routine that imports a  
Drools compiler class, for example, Eclipse does not find it merely  
from the Eclipse plugins (Drools plugins).

Sorry if this sounds ludicrous and confused, but any help greatly  
appreciated!

- Mike
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