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" />
<!-- Homepage -->
<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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