[m2] BIG problem with maven-antrun-plugin and workshop.core.AppClassLoader

[S . Bloch]

Hi

I've got a BIG problem with maven-antrun-plugin and a classloader from 
workshop.core.AppClassLoader from knex.jar (Weblogic).
When I was using ant, i'd to add:

-client -Djava.system.class.loader="workshop.core.AppClassLoader" 
-classpath 
"%LOCALCLASSPATH%;%BEA_HOME%\weblogic81\workshop\wlw-ide.jar;%BEA_HOME%\weblogic81\server\lib\weblogic.jar"

to my ant.bat to make my project work.

when i'm adding this to my mvn.bat, i can't use maven-antrun-plugin. I'm 
having this exception:

Caused by: java.lang.NullPointerException
        at org.apache.tools.ant.Task.log(Task.java:324)
        at 
com.bea.wlw.runtime.core.ear.WebAppBuildTask.execute(WebAppBuildTask.java:241)
        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:324)
        at org.apache.tools.ant.TaskAdapter.execute(TaskAdapter.java:123)
        ... 31 more

it's quite strange that error is 
at org.apache.tools.ant.Task.log(Task.java:324).

I'm using WebAppBuildTask that needs workshop.core.AppClassLoader.

I don't know what to do?

Please HELP!!!

Pozdrawiam
Sebastian Błoch