使用MultipleInputs出现InstantiationException

Exception in thread "main" java.lang.RuntimeException: java.lang.InstantiationException
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:115)
at com.mediav.hadoop.mapreduce.lib.input.MultipleInputs.getInputFormatMap(MultipleInputs.java:105)
at com.mediav.hadoop.mapreduce.lib.input.DelegatingInputFormat.getSplits(DelegatingInputFormat.java:55)
at org.apache.hadoop.mapred.JobClient.writeNewSplits(JobClient.java:885)
at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:779)
at org.apache.hadoop.mapreduce.Job.submit(Job.java:432)
at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:448)
at com.mediav.ipstat.IpStatJob.run(IpStatJob.java:49)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at com.mediav.ipstat.IpStatJob.main(IpStatJob.java:96)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.util.RunJar.main(RunJar.java:156)
Caused by: java.lang.InstantiationException
at sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(InstantiationExceptionConstructorAccessorImpl.java:30)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)

at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:113)

原因是： MultipleInputs.addInputPath(job, in2, FileInputFormat.class, DuoMobIpMapper.class);

                                TextInputFormat错写成FileInputFormat了。。。（有点隐蔽性）

                               改成： MultipleInputs.addInputPath(job, in2, TextInputFormat.class, DuoMobIpMapper.class);就ok了。。