Hello,

I'm seeing the following exception when I invoke a url that returns zero
content (which is expected in this test case):


Test Case (in groovy):

invoke(description: 'Positive: Verify server returns no content if cache is
correct',
      url: CACHED_URL)

storeLength(property: 'contentLength')

verifyProperty(description: 'content-length should be 0',
              name: 'contentLength',
              text: '0')


Exception(from webtest report):

com.canoo.webtest.engine.StepExecutionExceptionMessageUnexpected exception
caught: java.lang.NullPointerExceptionStacktrace

com.canoo.webtest.engine.StepExecutionException: Unexpected exception
caught: java.lang.NullPointerException, Step: InvokePage at :  with
(taskName="invoke")
        at com.canoo.webtest.steps.Step.handleUnexpectedException(Step.java:413)
        at 
com.canoo.webtest.steps.AbstractBrowserAction.handleUnexpectedException(AbstractBrowserAction.java:120)
        at 
com.canoo.webtest.steps.request.TargetHelper.protectedGoto(TargetHelper.java:115)
        at 
com.canoo.webtest.steps.request.AbstractTargetAction.gotoTarget(AbstractTargetAction.java:106)
        at 
com.canoo.webtest.steps.request.AbstractTargetAction.doExecute(AbstractTargetAction.java:78)
        at com.canoo.webtest.steps.Step.execute(Step.java:106)
        at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
        at org.apache.tools.ant.Task.perform(Task.java:364)
        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:106)
        at org.apache.tools.ant.Task.perform(Task.java:364)
        at com.canoo.webtest.ant.WebtestTask.execute(WebtestTask.java:164)
        at org.apache.tools.ant.Task.perform(Task.java:364)
        at groovy.util.AntBuilder.nodeCompleted(AntBuilder.java:177)
        at groovy.util.BuilderSupport.doInvokeMethod(BuilderSupport.java:175)
        at groovy.util.AntBuilder.doInvokeMethod(AntBuilder.java:138)
        at groovy.util.BuilderSupport.invokeMethod(BuilderSupport.java:86)
        at org.codehaus.groovy.runtime.Invoker.invokeMethod(Invoker.java:163)
        at 
org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.java:104)
        at 
org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethod(ScriptBytecodeAdapter.java:85)
        at 
net.mobio.webtest.tests.CacheControlTest.testCacheControlDigest(CacheControlTest.groovy:68)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at junit.framework.TestCase.runTest(TestCase.java:154)
        at junit.framework.TestCase.runBare(TestCase.java:127)
        at junit.framework.TestResult$1.protect(TestResult.java:106)
        at junit.framework.TestResult.runProtected(TestResult.java:124)
        at junit.framework.TestResult.run(TestResult.java:109)
        at junit.framework.TestCase.run(TestCase.java:118)
        at junit.framework.TestSuite.runTest(TestSuite.java:208)
        at junit.framework.TestSuite.run(TestSuite.java:203)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at 
org.apache.maven.surefire.junit.JUnitTestSet.execute(JUnitTestSet.java:210)
        at 
org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.executeTestSet(AbstractDirectoryTestSuite.java:135)
        at 
org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.execute(AbstractDirectoryTestSuite.java:122)
        at org.apache.maven.surefire.Surefire.run(Surefire.java:129)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at 
org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:225)
        at 
org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:747)
Caused by: java.lang.NullPointerException
        at org.apache.commons.io.IOUtils.copy(IOUtils.java:996)
        at org.apache.commons.io.IOUtils.toByteArray(IOUtils.java:217)
        at 
com.gargoylesoftware.htmlunit.WebResponseData.getBody(WebResponseData.java:150)
        at 
com.gargoylesoftware.htmlunit.WebResponseData.<init>(WebResponseData.java:105)
        at 
com.gargoylesoftware.htmlunit.HttpWebConnection.makeWebResponse(HttpWebConnection.java:387)
        at 
com.gargoylesoftware.htmlunit.HttpWebConnection.getResponse(HttpWebConnection.java:128)
        at 
com.gargoylesoftware.htmlunit.WebClient.loadWebResponseFromWebConnection(WebClient.java:1371)
        at 
com.gargoylesoftware.htmlunit.WebClient.loadWebResponse(WebClient.java:1329)
        at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:322)
        at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:389)
        at 
com.canoo.webtest.steps.request.TargetHelper.getResponse(TargetHelper.java:69)
        at 
com.canoo.webtest.steps.request.AbstractTargetAction.getResponse(AbstractTargetAction.java:68)
        at 
com.canoo.webtest.steps.request.InvokePage.findTarget(InvokePage.java:134)
        at 
com.canoo.webtest.steps.request.AbstractTargetAction$1.call(AbstractTargetAction.java:108)
        at 
com.canoo.webtest.steps.request.TargetHelper.protectedGoto(TargetHelper.java:88)
        ... 45 more


Is it possible to invoke a url and verify that the content length is zero?
I specifically need to test this because I'm testing that my server is
caching content.

Thanks,
Lars

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