[WICKET-5666] WicketTester "page was null" for reused stateless Form

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Implemented
• Affects Version/s: 6.16.0
• Component/s: wicket
• Environment: Ubuntu, Java7
• Assignee: Unassigned
• Reporter: Thibault Kruse
• Created: 06/Aug/14 16:28
• Updated: 07/Aug/14 08:53
• Resolved: 06/Aug/14 18:47

Description

Hi, so this is a weird bug, took ages to find out how to reproduce.
Basically we have a page with a form that calls setResponsePage in onSubmit().

Then we write a test for it that uses WicketTester.assertRenderedPage()

And under specific circumstances, we get back an AssertionError

junit.framework.AssertionFailedError: page was null
	at org.apache.wicket.util.tester.WicketTester.assertResult(WicketTester.java:566)
	at org.apache.wicket.util.tester.WicketTester.assertRenderedPage(WicketTester.java:476)
	at com.example.TestHomePage.testSubmitSecondPageFails(TestHomePage.java:37)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:74)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:211)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:67)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)

which does not make sense. We also found that modifying our example slightly would make the assertion work again, such as not clearing Page Params. Will provide link to quickstart project example.

Issue Links

• is related to: WICKET-5643 WebPageRenderer should bind a Session if redirect is required and the session is temporary.