解决Spring TestContext下运行JUnit4抛错（java.lang.NoClassDefFoundError）的问题
Spring版本2.5.5，JUnit 版本 4.8.1，使用了 Spring TestContext 的 SpringJUnit4ClassRunner。一直使用这个版本的JUnit，在写简单的测试时不会抛错，直到今天开始尝试写规范的JUnit测试代码，抛出了如下的错误:
java.lang.NoClassDefFoundError: org/junit/Assume$AssumptionViolatedException at org.springframework.test.context.junit4.SpringMethodRoadie.runTestMethod( SpringMethodRoadie.java:240) at org.springframework.test.context.junit4.SpringMethodRoadie$RunBeforesThenTestThenAfters.run( SpringMethodRoadie.java:333) at org.springframework.test.context.junit4.SpringMethodRoadie.runWithRepetitions( SpringMethodRoadie.java:217) at org.springframework.test.context.junit4.SpringMethodRoadie.runTest( SpringMethodRoadie.java:197) at org.springframework.test.context.junit4.SpringMethodRoadie.run( SpringMethodRoadie.java:143) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.invokeTestMethod( SpringJUnit4ClassRunner.java:142) at org.junit.internal.runners.JUnit4ClassRunner.runMethods( JUnit4ClassRunner.java:61) at org.junit.internal.runners.JUnit4ClassRunner$1.run( JUnit4ClassRunner.java:54) at org.junit.internal.runners.ClassRoadie.runUnprotected( ClassRoadie.java:34) at org.junit.internal.runners.ClassRoadie.runProtected( ClassRoadie.java:44) at org.junit.internal.runners.JUnit4ClassRunner.run( JUnit4ClassRunner.java:52) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run( JUnit4TestReference.java:50) at org.eclipse.jdt.internal.junit.runner.TestExecution.run( TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests( RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests( RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run( RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main( RemoteTestRunner.java:197)Caused by: java.lang.ClassNotFoundException: org.junit.Assume$AssumptionViolatedException at java.net.URLClassLoader$1.run( URLClassLoader.java:202 ) at java.security.AccessController.doPrivileged( Native Method ) at java.net.URLClassLoader.findClass( URLClassLoader.java:190 ) at java.lang.ClassLoader.loadClass( ClassLoader.java:306 ) at sun.misc.Launcher$AppClassLoader.loadClass( Launcher.java:301 ) at java.lang.ClassLoader.loadClass( ClassLoader.java:247 ) ... 17 more
找了下网上的资料[1,2]，这属于 Spring 与 JUnit 版本不兼容导致的。
解决方法：
修改JUnit 的版本至 4.4
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[1] http://forum.springsource.org/showthread.php?60230-spring-test-breaks-in-Junit-4-5
[2] https://jira.springsource.org/browse/SPR-5145
