I'm guessing that you don't want Integer.toInteger(), cause if you read the javadoc( http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Integer.html#getInteger(java.lang.String) you'll see that it's pulling a property from System.property with the passed name. If the property doesn't exist it returns null, thus giving you a null pointer.
You probably want parsetInt http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Integer.html#parseInt(java.lang.String ) Josh On Wed, Jul 23, 2008 at 8:43 PM, luna_guo <[EMAIL PROTECTED]> wrote: > > tapestry5.0.13 > @Inject > private org.apache.tapestry5.services.Request request; > > String param=request.getParameter(PARAM_NAME); > int id=coercer.coerce(param,Integer.class); > log.debug(PARAM_NAME+" is "+param); //it's ok, display a number. > int id=Integer.getInteger(param.toString()); //The error message come from > this link.because when i just set a number to id,it will goes well. > > the variable param is actually java.lang.String,right?So where is the error > come from? > Thanks a lot.it drives me nuts. > > > the following is the debug message: > > [DEBUG] 24:40(ConstructorServiceCreator.java:createObject:50) > Invoking constructor > org.apache.tapestry5.internal.services.InternalRequestGlobalsImpl() (at > InternalRequestGlobalsImpl.java:22). > > [ERROR] > 24:40(DefaultRequestExceptionHandler.java:handleRequestException:45) > Processing of request failed with uncaught exception: > org.apache.tapestry5.runtime.ComponentEventException > > org.apache.tapestry5.runtime.ComponentEventException [at > context:AbstractMessage.tml, line 47, column 97] > at > > org.apache.tapestry5.internal.structure.ComponentPageElementImpl.triggerContextEvent(ComponentPageElementImpl.java:1042) > at > > org.apache.tapestry5.internal.services.AjaxComponentEventRequestHandler.handle(AjaxComponentEventRequestHandler.java:92) > at > > $ComponentEventRequestHandler_11b530aa91a.handle($ComponentEventRequestHandler_11b530aa91a.java) > at > > org.apache.tapestry5.internal.services.AjaxFilter.handle(AjaxFilter.java:42) > at > > $ComponentEventRequestHandler_11b530aa91b.handle($ComponentEventRequestHandler_11b530aa91b.java) > at > > org.apache.tapestry5.services.TapestryModule$37.handle(TapestryModule.java:1987) > at > > $ComponentEventRequestHandler_11b530aa91b.handle($ComponentEventRequestHandler_11b530aa91b.java) > at > > $ComponentEventRequestHandler_11b530aa884.handle($ComponentEventRequestHandler_11b530aa884.java) > at > > org.apache.tapestry5.internal.services.ComponentEventDispatcher.dispatch(ComponentEventDispatcher.java:135) > at $Dispatcher_11b530aa887.dispatch($Dispatcher_11b530aa887.java) > at $Dispatcher_11b530aa879.dispatch($Dispatcher_11b530aa879.java) > at > > org.apache.tapestry5.services.TapestryModule$12.service(TapestryModule.java:938) > at cn.mcguo.banjia.services.AppModule$1.service(AppModule.java:23) > at > $RequestFilter_11b530aa878.service($RequestFilter_11b530aa878.java) > at > $RequestHandler_11b530aa87a.service($RequestHandler_11b530aa87a.java) > at > > org.apache.tapestry5.internal.services.LocalizationFilter.service(LocalizationFilter.java:42) > at > $RequestHandler_11b530aa87a.service($RequestHandler_11b530aa87a.java) > at > > org.apache.tapestry5.services.TapestryModule$2.service(TapestryModule.java:586) > at > $RequestHandler_11b530aa87a.service($RequestHandler_11b530aa87a.java) > at > > org.apache.tapestry5.internal.services.RequestErrorFilter.service(RequestErrorFilter.java:26) > at > $RequestHandler_11b530aa87a.service($RequestHandler_11b530aa87a.java) > at > > org.apache.tapestry5.internal.services.StaticFilesFilter.service(StaticFilesFilter.java:79) > at > $RequestHandler_11b530aa87a.service($RequestHandler_11b530aa87a.java) > at > > org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:93) > at > > org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:84) > at > > org.apache.tapestry5.ioc.internal.util.ConcurrentBarrier.withRead(ConcurrentBarrier.java:75) > at > > org.apache.tapestry5.internal.services.CheckForUpdatesFilter.service(CheckForUpdatesFilter.java:106) > at > $RequestHandler_11b530aa87a.service($RequestHandler_11b530aa87a.java) > at > $RequestHandler_11b530aa871.service($RequestHandler_11b530aa871.java) > at > > org.apache.tapestry5.services.TapestryModule$11.service(TapestryModule.java:918) > at > > org.apache.tapestry5.internal.services.IgnoredPathsFilter.service(IgnoredPathsFilter.java:62) > at > > $HttpServletRequestFilter_11b530aa870.service($HttpServletRequestFilter_11b530aa870.java) > at > > $HttpServletRequestHandler_11b530aa872.service($HttpServletRequestHandler_11b530aa872.java) > at > > $HttpServletRequestHandler_11b530aa86f.service($HttpServletRequestHandler_11b530aa86f.java) > at > org.apache.tapestry5.TapestryFilter.doFilter(TapestryFilter.java:168) > at > > org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084) > at > org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360) > at > org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) > at > org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181) > at > org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:722) > at > org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:404) > at > org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139) > at org.mortbay.jetty.Server.handle(Server.java:320) > at > org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505) > at > > org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:842) > at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:648) > at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211) > at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380) > at > > org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395) > at > > org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:450) > Caused by: java.lang.NullPointerException > at cn.mcguo.banjia.components.Star.onSwitch(Star.java:61) > at cn.mcguo.banjia.components.Star.dispatchComponentEvent(Star.java) > at > > org.apache.tapestry5.internal.structure.ComponentPageElementImpl.dispatchEvent(ComponentPageElementImpl.java:864) > at > > org.apache.tapestry5.internal.structure.ComponentPageElementImpl.triggerContextEvent(ComponentPageElementImpl.java:1025) > ... 49 more > [DEBUG] 24:40(RenderQueueImpl.java:run:91) > Executed 35 rendering commands in 0.000 seconds > -- > View this message in context: > http://www.nabble.com/Converting-type-of-request-parameter-error-tp18624966p18624966.html > Sent from the Tapestry - User mailing list archive at Nabble.com. > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > -- -- TheDailyTube.com. 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