运行job的时候出现以下异常:
java.lang.ClassCastException: class com.sun.jersey.core.impl.provider.entity.XMLJAXBElementProvider$Text at java.lang.Class.asSubclass(Class.java:3116) at org.apache.hadoop.mapred.JobConf.getOutputKeyComparator(JobConf.java:795) at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.<init>(MapTask.java:964) at org.apache.hadoop.mapred.MapTask$NewOutputCollector.<init>(MapTask.java:673) at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:756) at org.apache.hadoop.mapred.MapTask.run(MapTask.java:364) at org.apache.hadoop.mapred.Child$4.run(Child.java:255) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:415) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1190) at org.apache.hadoop.mapred.Child.main(Child.java:249)
,该异常是由于本应该引入org.apache.hadoop.io.Text类的时候,却引入了com.sun.jersey.core.impl.provider.entity.XMLJAXBElementProvider.Text,eclipse的自动提示中,org.apache.hadoop.io.Text类是排在靠下的位置的,所以很多时候一不小心引就入了错误的类。
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