运行mrunit报错问题解决

在看hadoop权威指南的时候，运行mrunit的例子（MaxTemperatureMapperTest）的时候，报出一个异常，网上查了资料后，是mrunit的版本问题，可以结合hadoop的版本，找到对应的mrunit的版本。

另外，我在找mrunit的过程中，因为http://mvnrepository.com/ 提供的mrunit不能下载，就自己随便找了一个，上传到我的nexus服务器上用了，但是在运行的过程中，还是存在一些问题，主要是mrunit还依赖了其他两个jar（mockito-all和powermock-api-mockito）,在pom.xml中同时加上这两个依赖，同时注意这两个jar的版本问题，在本文的后面，我给出了这两个jar的依赖，供参考。

java.lang.IncompatibleClassChangeError: Found interface org.apache.hadoop.mapreduce.TaskInputOutputContext, but class was expected
at org.apache.hadoop.mrunit.mapreduce.mock.MockContextWrapper.createCommon(MockContextWrapper.java:51)
at org.apache.hadoop.mrunit.mapreduce.mock.MockMapContextWrapper.create(MockMapContextWrapper.java:65)
at org.apache.hadoop.mrunit.mapreduce.mock.MockMapContextWrapper.<init>(MockMapContextWrapper.java:57)
at org.apache.hadoop.mrunit.mapreduce.MapDriver.run(MapDriver.java:195)
at org.apache.hadoop.mrunit.MapDriverBase.runTest(MapDriverBase.java:185)
at v1.MaxTemperatureMapperTest.processesValidRecord(MaxTemperatureMapperTest.java:22)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
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)

<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>mrunit</artifactId>
<version>1.1.0</version>
<classifier>hadoop2</classifier>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-all</artifactId>
<version>1.10.19</version>
</dependency>
<dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-api-mockito</artifactId>
<version>1.6.4</version>
</dependency>