Deploying BPM Suite based application on WebLogic 12c causes STUCK THREAD issues

Issue

• Having migrated a BPM Suite 6 based application to Oracle WebLogic Server 12c environments users started getting STUCK THREAD issue in the environment. How to troubleshoot such issue based on the thread dumps shared below?

"[STUCK] ExecuteThread: '80' for queue: 'weblogic.kernel.Default (self-tuning)'" Id=18453 RUNNABLE          
                at java.io.InputStream.skip(InputStream.java:220)          
                at weblogic.utils.http.HttpChunkInputStream.skip(HttpChunkInputStream.java:285)          
                at weblogic.utils.http.HttpChunkInputStream.skipAllChunk(HttpChunkInputStream.java:495)          
                at weblogic.servlet.internal.ServletInputStreamImpl.ensureChunkedConsumed(ServletInputStreamImpl.java:51)          
                at weblogic.servlet.internal.ServletRequestImpl.skipUnreadBody(ServletRequestImpl.java:217)          
                at weblogic.servlet.internal.ServletRequestImpl.reset(ServletRequestImpl.java:169)
                at weblogic.servlet.internal.ServletResponseImpl.send(ServletResponseImpl.java:1664)          
                at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1582)
                at weblogic.servlet.provider.ContainerSupportProviderImpl$WlsRequestExecutor.run(ContainerSupportProviderImpl.java:255)          
                at weblogic.work.ExecuteThread.execute(ExecuteThread.java:311)
                at weblogic.work.ExecuteThread.run(ExecuteThread.java:263)
...