java.lang.NoClassDefFoundError: org/hamcrest/SelfDescribing

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Java 使用 junit 的时候报异常，提示找不到类：

java.lang.NoClassDefFoundError: org/hamcrest/SelfDescribingat java.lang.ClassLoader.defineClass1(Native Method)at java.lang.ClassLoader.defineClass(ClassLoader.java:621)at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)at java.net.URLClassLoader.access$000(URLClassLoader.java:56)at java.net.URLClassLoader$1.run(URLClassLoader.java:195)at java.security.AccessController.doPrivileged(Native Method)at java.net.URLClassLoader.findClass(URLClassLoader.java:188)at java.lang.ClassLoader.loadClass(ClassLoader.java:307)at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)at java.lang.ClassLoader.loadClass(ClassLoader.java:252)at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)at java.lang.Class.getDeclaredConstructors0(Native Method)at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)at java.lang.Class.getConstructor0(Class.java:2699)at java.lang.Class.getConstructor(Class.java:1657)at org.junit.internal.builders.AnnotatedBuilder.buildRunner(AnnotatedBuilder.java:29)at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:21)at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:26)at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:26)at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.<init>(JUnit4TestReference.java:33)at org.eclipse.jdt.internal.junit4.runner.JUnit4TestClassReference.<init>(JUnit4TestClassReference.java:25)at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createTest(JUnit4TestLoader.java:48)at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.loadTests(JUnit4TestLoader.java:38)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:452)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.hamcrest.SelfDescribingat java.net.URLClassLoader$1.run(URLClassLoader.java:200)at java.security.AccessController.doPrivileged(Native Method)at java.net.URLClassLoader.findClass(URLClassLoader.java:188)at java.lang.ClassLoader.loadClass(ClassLoader.java:307)at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)at java.lang.ClassLoader.loadClass(ClassLoader.java:252)at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)

分析原因：

1、首先检查是否缺少hamcrest包，如果不存在添加hamcrest包（hamcrest-core-1.3.jar）

2、右键点击项目-属性-Java Build Path-Source-Output Folder-设置成：项目名称/target/test-classes

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