JUnit: NoClassDefFoundError: org/junit/runner/manipulation/Filter [duplicate]

问题

When I try to run some unit tests, the following error is raised:

java.lang.NoClassDefFoundError: org/junit/runner/manipulation/Filter
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:190)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.loadTestLoaderClass(RemoteTestRunner.java:320)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.createRawTestLoader(RemoteTestRunner.java:310)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.createLoader(RemoteTestRunner.java:305)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.defaultInit(RemoteTestRunner.java:283)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.init(RemoteTestRunner.java:207)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:191)

I have to mention that junit-4.11.jar is added to project build path. Any ideas?

EDIT: I (Gábor Lipták) have read the other question this question supposed to be a duplicate of. This is NOT a duplicate. If someone has Gradle Buildship as build plugin in Eclipse, exactly this error is thrown, if you mistakenly put your test class in main/resorces instead of test/resources. Buildship seems to take care of test vs. compile classpath, when it comes to generate a run configuration. See the following snippets of my .classpath file below as evidence:

<classpathentry kind="src" output="bin/main" path="src/main/resources">
    <attributes>
        <attribute name="gradle_scope" value="main"/>
        <attribute name="gradle_used_by_scope" value="main,test"/>
    </attributes>
</classpathentry>

<classpathentry kind="src" output="bin/test" path="src/test/resources">
    <attributes>
        <attribute name="gradle_scope" value="test"/>
        <attribute name="gradle_used_by_scope" value="test"/>
    </attributes>
</classpathentry>

回答1:

Even I was facing the same issue, so try the below steps -

Right click the project in Package Explorer, and click Properties.
Click the Libraries tab.
Click the Add library button.
Select JUnit and click Next.
Select JUnit 4 (that's what I am using).
Click finish.
Now right click the file containing unit tests and select Properties.
Under the Run/Debug settings, remove any entries from the Launch Configurations for that file. Hit ok.

Hopefully you'll be able to run the tests now.

来源：https://stackoverflow.com/questions/33521436/junit-noclassdeffounderror-org-junit-runner-manipulation-filter

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