我有以下pom.xml。POM.xml4.0.0com.datasys.prasannahadoop-wordcount1.0.0jarhadoop-wordcounthttp://maven.apache.orgUTF-8org.apache.hadoophadoop-core1.2.1当我创建一个像mvnpackage这样的jar时，我得到一个名为hadoop-wordcount-1.0.0.jar的jar但是当我尝试像hadoopjarhadoop-wordcount-1.0.0.jarWordCount/input/out1它说Exceptioninthread"main"ja