MapReduce 本地执行hadoop程序 报错 java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
2017-05-12 16:37
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java.lang.Exception: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException at org.apache.hadoop.mapred.LocalJobRunner$Job.runTasks(LocalJobRunner.java:462) at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:522) Caused by: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:131) at org.apache.hadoop.mapred.JobConf.getOutputKeyComparator(JobConf.java:884) at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.init(MapTask.java:981) at org.apache.hadoop.mapred.MapTask.createSortingCollector(MapTask.java:391) at org.apache.hadoop.mapred.MapTask.access$100(MapTask.java:80) at org.apache.hadoop.mapred.MapTask$NewOutputCollector.<init>(MapTask.java:675) at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:747) at org.apache.hadoop.mapred.MapTask.run(MapTask.java:340) at org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:243) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.reflect.InvocationTargetException 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:408) at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:129) ... 13 more Caused by: java.lang.RuntimeException: java.lang.NoSuchMethodException: com.likun.mr.friend.User.<init>() at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:131) at org.apache.hadoop.io.WritableComparator.newKey(WritableComparator.java:144) at org.apache.hadoop.io.WritableComparator.<init>(WritableComparator.java:130) at org.apache.hadoop.io.WritableComparator.<init>(WritableComparator.java:121) at com.likun.mr.friend.FofSort.<init>(FofSort.java:8) ... 18 more Caused by: java.lang.NoSuchMethodException: com.likun.mr.friend.User.<init>() at java.lang.Class.getConstructor0(Class.java:3074) at java.lang.Class.getDeclaredConstructor(Class.java:2170) at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:125) ... 22 more
今天写一个查找共同好友的hadoop 程序是出现了上面的错误,用百度上的什么使用jar包运行也没解决!无意中找到了,一个博主写的!
http://blog.csdn.net/zhouyan8603/article/details/50963563
当你使用自己的类实现WritableComparable接口时,必须要写上默认构造方法,加上默认的构造方法后问题解决了!
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