Javadoc2Libdoc Get NullStream when using -P to run robotframework

[frank007love]

When I use the below command to import Selenium2Library, and I will get ExceptionInInitializerError
java -jar "$BASEPATH/robotframework.jar" -P $BASEPATH/javalib/robotframework-selenium2library.jar "$@"

And it works when I replace -P with -cp to launch Robotframework:
java -cp $BASEPATH/robotframework.jar:$BASEPATH/javalib/* org.robotframework.RobotFramework "$@"

It seems a ClassLoader problem.

There's a same problem on Robotframework user group:
https://groups.google.com/forum/#!topic/robotframework-users/tJjeZm0JEE0