snippets/liferay/camunda-bpm-liferay-tasklist/src/main/java/org/camunda/demo/liferay/tasklist/TasklistBean.java
private void setSharedAttribute(Task task) {
    setSharedAttribute(BRIDGE_TASK_ID, task.getId());
    setSharedAttribute(BRIDGE_PROCESS_DEFINITION_ID, null);
  }
private void setSharedAttribute(Task task) {
    setSharedAttribute(BRIDGE_TASK_ID, task.getId());
    setSharedAttribute(BRIDGE_PROCESS_DEFINITION_ID, null);
  }
Do this as a workaround till IPC works correctly see
http://www.liferay.com/
de/community/forums/-/message_boards/message/27295776