Can't execute rosjava Nodes. RosRUn not found Exception

edit

I`ve been able to build and execute the tutorial_pubsub. Then i created a new Rosjava package in an existing catkin_ws. When i run gradle install and gradle installApp it all compiles right. But when i now try to execute these new nodes:

scryer@Scryer:~/catkin_ws/src/rosjava_foo$ ./build/install/rosjava_foo/bin/rosjava_foo ben.dude.Listener

i get:

Exception in thread "main" java.lang.NoClassDefFoundError: org/ros/RosRun
Caused by: java.lang.ClassNotFoundException: org.ros.RosRun
    at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: org.ros.RosRun. Program will exit.

What am i missing to execute Nodes that are not in the rosjava folder?