3377948 - Error encountered when accessing FORUMS after upgrading NetWeaver Java to SP27 or higher version

After upgrading to NW 7.50 SP27 or higher version, the FORUMS application is not available any more. The following error can be seen:

500 Internal Server Error
Error: Application error occurred during the request processing.
Error occurred in Invoking event "contextInitialized()" on listener class com.sap.netweaver.coll.forums.base.ApplicationLifeCycleListener.
Details: WebApplicationException log ID is ...

In the default trace the following error is written:

com.sap.ASJ.web.000500#BC-COM-FOR#sap.com/com.sap.netweaver.coll.forums#C0000AD832AE003000000003002A411A#7387750000000004#sap.com/com.sap.netweaver.coll.forums#com.sap.engine.services.servlets_jsp.ISE500#J2EE_GUEST#0##B14D93C144FA11EE9F9C00000070BA66#a8a0865144fa11eec06100000070ba66##0#Thread[HTTP Worker [@548575756],5,Dedicated_Application_Thread]#Plain##
500 Internal Server Error is returned for HTTP request [http://<host:port>/forums/index.jsp]:
  component [jsp],
  web module [forums],
  application [sap.com/com.sap.netweaver.coll.forums],
  DC name [sap.com/com.sap.netweaver.coll.forums],
  CSN component[BC-COM-FOR],
  problem categorization [com.sap.ASJ.web.000137],
  internal categorization [870027766].

[EXCEPTION]
java.lang.NullPointerException: while trying to invoke the method com.sap.netweaver.coll.forums.ume.UserManagerConnector.getUser(com.sap.security.api.IUser) of a null object returned from com.sap.netweaver.coll.forums.connectors.JiveApplicationConnector.getForumUserManager()
    at com.sap.netweaver.coll.forums.connectors.JiveApplicationConnector.ensureSystemAdminPermissions(JiveApplicationConnector.java:149)
    at com.sap.netweaver.coll.forums.connectors.JiveApplicationConnector.getServiceUser(JiveApplicationConnector.java:69)
    at com.sap.netweaver.coll.forums.base.ApplicationLifeCycleListener.contextInitialized(ApplicationLifeCycleListener.java:79)
...

• SAP Netweaver 7.5

WIKI , KBA , BC-COM-FOR , Forums , Problem