After upgrade to gradle 5 , the two portable runner test projects on jenkins
- beam_PostCommit_Java_PVR_Flink_Streaming 
- beam_PostCommit_Java_PVR_Flink_Batch 
First investigation seems to point the tests to be failing on direct buffer memory (e.g. ) while staging files.
Although I am unsure, whether this is really the root cause, or something that shows up after some other failure.
As far as I know, we do not set `-XX:MaxDirectMemorySize` anywhere in our setup, neither does gradle itself. At least on my machine both gradle 4 and gradle 5 stick to the same jvm default
Unfortunately this does not reproduce on (my) local machine. We might try to workaround here by increasing ` -XX:MaxDirectMemorySize==3G` but this would probably only hide the problem? But might still be helpful to increase temporarily on branch just to be sure, that this is indeed the root cause?