[webtest][JIRA] Created: (WT-541) NullpointerException when executing custom step

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[webtest][JIRA] Created: (WT-541) NullpointerException when executing custom step

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NullpointerException when executing custom step
-----------------------------------------------

Key: WT-541
URL: http://webtest-community.canoo.com/jira/browse/WT-541
Project: WebTest
Type: Bug

Versions: 3.0
Environment: Ant 1.7.1
Java SE 1.6.0.16
Ubuntu Jaunty (9.04)
Reporter: Thomas Vöcking

When trying to execute a custom step, I get the following exception:

/home/thomas/development/canoo/webtest.xml:11: Unexpected exception
caught: org.apache.tools.ant.BuildException
at com.canoo.webtest.steps.StepUtil.handleException(StepUtil.java:122)
at com.canoo.webtest.steps.Step.handleException(Step.java:387)
at com.canoo.webtest.steps.Step.execute(Step.java:118)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at com.canoo.webtest.ant.WebtestTask.executeSteps(WebtestTask.java:236)
at com.canoo.webtest.ant.WebtestTask.execute(WebtestTask.java:208)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:357)
at org.apache.tools.ant.Target.performTasks(Target.java:385)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)
at org.apache.tools.ant.Project.executeTarget(Project.java:1306)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1189)
at org.apache.tools.ant.Main.runBuild(Main.java:758)
at org.apache.tools.ant.Main.startAnt(Main.java:217)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104)
Caused by: /home/thomas/development/canoo/firstWebTest.xml:18: java.lang.NullPointerException
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:116)
at org.apache.tools.ant.Task.perform(Task.java:348)
at com.canoo.webtest.ant.TestStepSequence.executeSteps(TestStepSequence.java:43)
at com.canoo.webtest.ant.TestStepSequence.doExecute(TestStepSequence.java:31)
at com.canoo.webtest.steps.Step.execute(Step.java:103)
... 25 more
Caused by: java.lang.NullPointerException
at com.canoo.webtest.engine.WebTestException.readUrlCurrentResponse(WebTestException.java:29)
at com.canoo.webtest.engine.WebTestException.<init>(WebTestException.java:25)
at com.canoo.webtest.engine.WebTestException.<init>(WebTestException.java:40)
at com.canoo.webtest.engine.WebTestException.<init>(WebTestException.java:48)
at com.canoo.webtest.engine.StepExecutionException.<init>(StepExecutionException.java:25)
at com.canoo.webtest.steps.Step.checkContextDefined(Step.java:129)
at com.canoo.webtest.steps.Step.execute(Step.java:99)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
... 29 more
--- Nested Exception ---
/home/thomas/development/canoo/firstWebTest.xml:18: java.lang.NullPointerException
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:116)
at org.apache.tools.ant.Task.perform(Task.java:348)
at com.canoo.webtest.ant.TestStepSequence.executeSteps(TestStepSequence.java:43)
at com.canoo.webtest.ant.TestStepSequence.doExecute(TestStepSequence.java:31)
at com.canoo.webtest.steps.Step.execute(Step.java:103)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at com.canoo.webtest.ant.WebtestTask.executeSteps(WebtestTask.java:236)
at com.canoo.webtest.ant.WebtestTask.execute(WebtestTask.java:208)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:357)
at org.apache.tools.ant.Target.performTasks(Target.java:385)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)
at org.apache.tools.ant.Project.executeTarget(Project.java:1306)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1189)
at org.apache.tools.ant.Main.runBuild(Main.java:758)
at org.apache.tools.ant.Main.startAnt(Main.java:217)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104)
Caused by: java.lang.NullPointerException
at com.canoo.webtest.engine.WebTestException.readUrlCurrentResponse(WebTestException.java:29)
at com.canoo.webtest.engine.WebTestException.<init>(WebTestException.java:25)
at com.canoo.webtest.engine.WebTestException.<init>(WebTestException.java:40)
at com.canoo.webtest.engine.WebTestException.<init>(WebTestException.java:48)
at com.canoo.webtest.engine.StepExecutionException.<init>(StepExecutionException.java:25)
at com.canoo.webtest.steps.Step.checkContextDefined(Step.java:129)
at com.canoo.webtest.steps.Step.execute(Step.java:99)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
... 29 more
--- Nested Exception ---
java.lang.NullPointerException
at com.canoo.webtest.engine.WebTestException.readUrlCurrentResponse(WebTestException.java:29)
at com.canoo.webtest.engine.WebTestException.<init>(WebTestException.java:25)
at com.canoo.webtest.engine.WebTestException.<init>(WebTestException.java:40)
at com.canoo.webtest.engine.WebTestException.<init>(WebTestException.java:48)
at com.canoo.webtest.engine.StepExecutionException.<init>(StepExecutionException.java:25)
at com.canoo.webtest.steps.Step.checkContextDefined(Step.java:129)
at com.canoo.webtest.steps.Step.execute(Step.java:99)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at com.canoo.webtest.ant.TestStepSequence.executeSteps(TestStepSequence.java:43)
at com.canoo.webtest.ant.TestStepSequence.doExecute(TestStepSequence.java:31)
at com.canoo.webtest.steps.Step.execute(Step.java:103)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at com.canoo.webtest.ant.WebtestTask.executeSteps(WebtestTask.java:236)
at com.canoo.webtest.ant.WebtestTask.execute(WebtestTask.java:208)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:357)
at org.apache.tools.ant.Target.performTasks(Target.java:385)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)
at org.apache.tools.ant.Project.executeTarget(Project.java:1306)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1189)
at org.apache.tools.ant.Main.runBuild(Main.java:758)
at org.apache.tools.ant.Main.startAnt(Main.java:217)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104)

This is the interesting part of my buildfile:

<project name="SimpleTest" basedir="." default="wt.full">

<property name="webtest.home" location="." />
<import file="${webtest.home}/webtest.xml"/>

<target name="wt.testInWork">
<webtest name="Test Case">

<config useInsecureSSL="true" />

<taskdef name="myCustomStep" classname="de.mycompany.webtests.support.StoreOrderId" classpathref="wt.defineTasks.classpath.webtest" />


<invoke url="http://localhost" />
<myCustomStep xpath="//*"/>
...

.. and this is my java class (Just an empty class, only for testing):

public class StoreOrderId extends com.canoo.webtest.steps.StoreXPath
{
}

-------

The problem here seems to be the definition of my class inside a taskdef element:
<taskdef name="myCustomStep" classname="de.mycompany.webtests.support.StoreOrderId" classpathref="wt.defineTasks.classpath.webtest" />

When I remove this line and add the step-definition to "webtest.taskdef" file in the webtest.jar, everything works fine.

Seems to me that the static definition of the ThreadLocal CONTEXT_HOLDER in WebtestTask.java is the problem.. maybe caused by a different classloader that is called by the taskdef-Element and so the ThreadLocal is defined twice.

I hope, this helps you.

Regards,
Thomas

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