Fixes an issue with wrong ClassLoader when submitting JobJars.

stratosphere-clients/src/main/java/eu/stratosphere/client/program/Client.java

@@ -187,6 +187,7 @@ public class Client {
 	}
 	
 	public JobExecutionResult run(final PackagedProgram prog, int parallelism, boolean wait) throws ProgramInvocationException {
+		Thread.currentThread().setContextClassLoader(prog.getUserCodeClassLoader());
 		if (prog.isUsingProgramEntryPoint()) {
 			return run(prog.getPlanWithJars(), parallelism, wait);
 		}