Maven工程junit运行报错：java.lang.NoClassDefFoundError: org/springframework/core/AttributeAccessor

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在使用Maven进行单元测试时遇到错误：java.lang.NoClassDefFoundError: org/springframework/core/AttributeAccessor。经过排查，发现是由于Spring版本过旧导致。将Spring版本从4.0.2.RELEASE更新到4.2.6.RELEASE后，问题得到解决。

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这个问题困扰了我好几天，一直没有找到有效的解决方法，后来发现是spring的版本导致的问题：

修改前：

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
   <spring.version>4.0.2.RELEASE</spring.version>
   
   <mybatis.version>3.2.6</mybatis.version>
   <slf4j.version>1.7.7</slf4j.version>
   <log4j.version>1.2.17</log4j.version>
</properties>

java.lang.NoClassDefFoundError: org/springframework/core/AttributeAccessor
   at java.lang.ClassLoader.defineClass1(Native Method)
   at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
   at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
   at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
   at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
   at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
   at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
   at java.security.AccessController.doPrivileged(Native Method)
   at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
   at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
   at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTestContextManager(SpringJUnit4ClassRunner.java:120)
   at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.<init>(SpringJUnit4ClassRunner.java:109)
   at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
   at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
   at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
   at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
   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:444)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
   at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: java.lang.ClassNotFoundException: org.springframework.core.AttributeAccessor
   at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
   at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
   ... 32 more

修改后：

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
   <spring.version>4.2.6.RELEASE</spring.version>
   <mybatis.version>3.2.6</mybatis.version>
   <slf4j.version>1.7.7</slf4j.version>
   <log4j.version>1.2.17</log4j.version>
</properties>