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Hi, I use ZK5.0.4, Tomcat 6.0.26, and Sybase TDS5.5. Whenever DB folks recycle their Database, I get the NullPointerException error below. I have to restart Tomcat and everything works fine again. I have a ServletFilter that check the login user for authorization access, if he/she has correct access right, then will "chain.doFilter(request, response)" to the main Zul page. I trace thru debugger, and it gives the exception right after this chain.doFilter(request, response) line. Netbeans doesn't let me "Step Into" this line to see what's going on inside. Any insight is greatly appreciated. Thanks...
Tomcat log:
========
Sep 30, 2010 8:35:49 PM org.apache.catalina.core.StandardWrapperValve invoke SEVERE: Servlet.service() for servlet zkLoader threw exception java.lang.NullPointerException: Null Pointer in Method Invocation at bsh.Name.invokeMethod(Unknown Source) at bsh.BSHMethodInvocation.eval(Unknown Source) at bsh.BSHPrimaryExpression.eval(Unknown Source) at bsh.BSHPrimaryExpression.eval(Unknown Source) at bsh.BSHBinaryExpression.eval(Unknown Source) at bsh.BSHIfStatement.evaluateCondition(Unknown Source) at bsh.BSHIfStatement.eval(Unknown Source) at bsh.Interpreter.eval(Unknown Source) at bsh.Interpreter.eval(Unknown Source) at org.zkoss.zk.scripting.bsh.BSHInterpreter.exec(BSHInterpreter.java:134) at org.zkoss.zk.scripting.util.GenericInterpreter.interpret(GenericInterpreter.java:341) at org.zkoss.zk.ui.impl.PageImpl.interpret(PageImpl.java:847) at org.zkoss.zk.ui.impl.UiEngineImpl.execNonComponent(UiEngineImpl.java:824) at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:624) at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:634) at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:602) at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:569) at org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage0(UiEngineImpl.java:369) at org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage(UiEngineImpl.java:291) at org.zkoss.zk.ui.http.DHtmlLayoutServlet.process(DHtmlLayoutServlet.java:243) at org.zkoss.zk.ui.http.DHtmlLayoutServlet.doGet(DHtmlLayoutServlet.java:164) at javax.servlet.http.HttpServlet.service(HttpServlet.java:617) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at GcmScLaunch.AuthorizationFilter.doFilter(AuthorizationFilter.java:119) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:859) at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579) at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1555) at java.lang.Thread.run(Thread.java:619)
Hi zknewbie1
Could you provide your filter sample ?
Asked: 2010-10-01 11:22:25 +0800
Seen: 328 times
Last updated: Oct 04 '10
