Debugging HtmlUnit: FailingHttpStatusCodeException 500 Server Error

[Alexandra Goultiaeva]

I am working on Jenkins Unit tests, and am trying to add a round trip test.

Unfortunately, I keep getting errors.

Here is a branch with my (broken) changes.

I've added the roundtrip test ClassicUploadStepTest

When I run the test, I get the following error:

com.gargoylesoftware.htmlunit.FailingHttpStatusCodeException: 500 Server Error for http://localhost:33657/jenkins/job/test0/configure

I've played with the test a bit, and found that if I comment out my setUp, the test works. It seems that the test breaks as soon as I add the following line:

SystemCredentialsProvider.getInstance().getCredentials().add(credentials);

I'm somewhat at a loss as to how to debug this further.

Stack traces seem to point to where the exception is thrown (throwFailingHttpStatusCodeExceptionIfNecessary), and not where the error occurred. The error itself is quite generic.

Any hints on how to approach this?

How can I try to get at the root cause for the 500?

Thanks!

PS. This is the stack trace I'm getting:

testRoundtrip(com.google.jenkins.plugins.storage.ClassicUploadStepTest)  Time elapsed: 6.1 sec  <<< ERROR!

com.gargoylesoftware.htmlunit.FailingHttpStatusCodeException: 500 Server Error for http://localhost:37367/jenkins/job/test0/configure

at com.gargoylesoftware.htmlunit.WebClient.throwFailingHttpStatusCodeExceptionIfNecessary(WebClient.java:535)

at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:360)

at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:415)

at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:400)

at org.jvnet.hudson.test.JenkinsRule$WebClient.goTo(JenkinsRule.java:2148)

at org.jvnet.hudson.test.JenkinsRule$WebClient.goTo(JenkinsRule.java:2128)

at org.jvnet.hudson.test.JenkinsRule$WebClient.getPage(JenkinsRule.java:2084)

at org.jvnet.hudson.test.JenkinsRule.configRoundtrip(JenkinsRule.java:1077)

at org.jvnet.hudson.test.JenkinsRule.configRoundtrip(JenkinsRule.java:1087)

at com.google.jenkins.plugins.storage.ClassicUploadStepTest.ConfigurationRoundTripTest(ClassicUploadStepTest.java:82)

at com.google.jenkins.plugins.storage.ClassicUploadStepTest.testRoundtrip(ClassicUploadStepTest.java:89)

[Robert Sandell]

A 500 server error is an indication that an exception was thrown in the backend when the http request was made.

You should see another stacktrace in the log just before the FailingHttpstatusCodeException.

/B

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Robert Sandell

Software Engineer

CloudBees Inc.

[Alexandra Goultiaeva]

Ooh, right, thanks!

In case there will be another newbie reading this:

The output from "mvn package" contains the last exception thrown, but it's not the whole log!

Running the individual test gave the full log:

mvn test -Dtest=com.google.jenkins.plugins.storage.ClassicUploadStepTest

In my case I haven't mocked out getDescriptor(), so it returns nullptr and the server dies with NullPointerException

Thanks for getting me on track again!

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