Servlet Exception

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Hi Team,

Recently we restarted the production server after which one of the servlet/strut based application is giving 500 internal sever error. After going through the log file, i found the below servlet exception:

Error##Plain###application [fs/cip] Processing HTTP request to servlet [action] finished with error. The error is: javax.servlet.ServletException

at org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:545)

at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:486)

at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)

at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)

at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)

at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:401)

at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:266)

at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:387)

at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:365)

at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:944)

at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:266)

at com.sap.engine.services.httpserver.server.Client.handle(Client.java:95)

at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:175)

at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)

at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)

at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)

at java.security.AccessController.doPrivileged(Native Method)

at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:100)

at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:170)

#

#1.5 #00215A0D92BD0059000007A8000033C100048F930C7BADCF#1283761635871#com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl#amat.com/fs~fs#com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl#X055730#15236##EPP2DI.mis.amat_P15_645145854#Guest#83193260b99011df9c0b00215a0d92bd#SAPEngine_Application_Thread[impl:3]_39##0#0#Error#1#/System/Server/WebRequests#Plain###application [fs/cip] Processing HTTP request to servlet [action] finished with error.

The error is: javax.servlet.ServletException: null

Please suggest what could be the problem. Appreciate a qu