[WICKET-928] Exception when clicking two times rapidly on the "next" button in a wizard

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Cannot Reproduce
• Affects Version/s: 1.3.0-beta2, 1.3.0-beta3
• Fix Version/s: 1.3.5
• Component/s: wicket-extensions
• Assignee: Igor Vaynberg
• Reporter: Joël Vimenet
• Created: 04/Sep/07 16:03
• Updated: 27/Sep/08 07:38
• Resolved: 27/Sep/08 07:38

Description

On a tree steps wizard, the first step contains two fields without any validation. The second one contains only one field that must be an integer. The last step will display the data entered in the two first steps.
When I am on the first step, and I click two times rapidly on the "next" button, it throws an exception.
Here is the stack trace :

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WicketMessage: Method onFormSubmitted of interface org.apache.wicket.markup.html.form.IFormSubmitListener targeted at component [MarkupContainer [Component id = form, page = test.www.factory.TestPage, path = 0:wizard:form.Form, isVisible = true, isVersioned = false]] threw an exception

Root cause:

java.lang.NullPointerException
at org.apache.wicket.util.convert.converters.AbstractConverter.parse(AbstractConverter.java:50)
at org.apache.wicket.util.convert.converters.AbstractNumberConverter.parse(AbstractNumberConverter.java:71)
at org.apache.wicket.util.convert.converters.IntegerConverter.convertToObject(IntegerConverter.java:44)
at org.apache.wicket.markup.html.form.FormComponent.convertInput(FormComponent.java:1159)
at org.apache.wicket.markup.html.form.FormComponent.validate(FormComponent.java:1027)
at org.apache.wicket.markup.html.form.Form$15.validate(Form.java:1671)
at org.apache.wicket.markup.html.form.Form$ValidationVisitor.formComponent(Form.java:160)
at org.apache.wicket.markup.html.form.FormComponent.visitFormComponentsPostOrderHelper(FormComponent.java:403)
at org.apache.wicket.markup.html.form.FormComponent.visitFormComponentsPostOrderHelper(FormComponent.java:390)
at org.apache.wicket.markup.html.form.FormComponent.visitFormComponentsPostOrderHelper(FormComponent.java:390)
at org.apache.wicket.markup.html.form.FormComponent.visitFormComponentsPostOrderHelper(FormComponent.java:390)
at org.apache.wicket.markup.html.form.FormComponent.visitFormComponentsPostOrder(FormComponent.java:368)
at org.apache.wicket.markup.html.form.Form.visitFormComponentsPostOrder(Form.java:1004)
at org.apache.wicket.markup.html.form.Form.validateComponents(Form.java:1667)
at org.apache.wicket.markup.html.form.Form.validate(Form.java:1658)
at org.apache.wicket.markup.html.form.Form.process(Form.java:811)
at org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:783)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:186)
at org.apache.wicket.request.target.component.listener.ListenerInterfaceRequestTarget.processEvents(ListenerInterfaceRequestTarget.java:73)
at org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:90)
at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1032)
at org.apache.wicket.RequestCycle.step(RequestCycle.java:1108)
at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1177)
at org.apache.wicket.RequestCycle.request(RequestCycle.java:500)
at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:261)
at org.apache.wicket.protocol.http.WicketServlet.doPost(WicketServlet.java:144)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:210)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:870)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
at java.lang.Thread.run(Thread.java:595)

Complete stack:

org.apache.wicket.WicketRuntimeException: Method onFormSubmitted of interface org.apache.wicket.markup.html.form.IFormSubmitListener targeted at component [MarkupContainer [Component id = form, page = test.www.factory.TestPage, path = 0:wizard:form.Form, isVisible = true, isVersioned = false]] threw an exception
at org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:197)
at org.apache.wicket.request.target.component.listener.ListenerInterfaceRequestTarget.processEvents(ListenerInterfaceRequestTarget.java:73)
at org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:90)
at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1032)
at org.apache.wicket.RequestCycle.step(RequestCycle.java:1108)
at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1177)
at org.apache.wicket.RequestCycle.request(RequestCycle.java:500)
at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:261)

java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:186)
at org.apache.wicket.request.target.component.listener.ListenerInterfaceRequestTarget.processEvents(ListenerInterfaceRequestTarget.java:73)
at org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:90)
at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1032)
at org.apache.wicket.RequestCycle.step(RequestCycle.java:1108)
at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1177)
at org.apache.wicket.RequestCycle.request(RequestCycle.java:500)
at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:261)

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The first click on "next" seems to make the wizard go into the second step but the second click sends a request from the first step, which is not correct with the actual state of the wizard...
Am I clear?

Please find enclosed a sample of code to reproduce the bug.