I am using pager-taglib jar to accomplish pagination in my GAE application. 
Pagination works fine when the app tested on local envirornment but after 
deploying to the appengine it's showing me followinf exception while 
attempting to pagination. Please help me to sort out what went wrong. 

-java.lang.NullPointerException

        at 
com.google.appengine.runtime.Request.process-69d020cae5a9b936(Request.java)
        at org.apache.jsp.viewsar_jsp._jspService(viewsar_jsp.java:117)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at 
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
        at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
        at 
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
        at 
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
        at 
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
        at 
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
        at 
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
        at org.mortbay.jetty.Server.handle(Server.java:326)
        at 
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
        at 
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
        at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:437)
        at com.google.net.rpc.impl.Server$RpcTask.runInContext(Server.java:573)
        at 
com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:448)
        at com.google.tracing.TraceContext.runInContext(TraceContext.java:688)
        at 
com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:326)
        at 
com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:318)
        at 
com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:446)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) 

at java.lang.Thread.run(Thread.java:636) 

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