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https://issues.apache.org/jira/browse/HADOOP-17073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17138053#comment-17138053
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Masatake Iwasaki commented on HADOOP-17073:
-------------------------------------------
Adding junit jar to the classpath is workadound. It should be done in CLI
scripts.
{noformat}
$ HADOOP_CLASSPATH=share/hadoop/tools/lib/junit-4.12.jar bin/mapred minicluster
{noformat}
> Fix NoClassDefFoundError on 'mapred minicluster'
> ------------------------------------------------
>
> Key: HADOOP-17073
> URL: https://issues.apache.org/jira/browse/HADOOP-17073
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Masatake Iwasaki
> Assignee: Masatake Iwasaki
> Priority: Major
>
> {noformat}
> $ bin/mapred minicluster
> 2020-06-17 12:01:29,133 INFO mapreduce.MiniHadoopClusterManager: Updated 0
> configuration settings from command line.
> Exception in thread "main" java.lang.NoClassDefFoundError: org/junit/Assert
> at
> org.apache.hadoop.test.GenericTestUtils.assertExists(GenericTestUtils.java:298)
> at
> org.apache.hadoop.test.GenericTestUtils.getTestDir(GenericTestUtils.java:242)
> at
> org.apache.hadoop.test.GenericTestUtils.getTestDir(GenericTestUtils.java:251)
> at
> org.apache.hadoop.hdfs.MiniDFSCluster.getBaseDirectory(MiniDFSCluster.java:2982)
> at
> org.apache.hadoop.hdfs.MiniDFSCluster$Builder.<init>(MiniDFSCluster.java:224)
> at
> org.apache.hadoop.mapreduce.MiniHadoopClusterManager.start(MiniHadoopClusterManager.java:157)
> at
> org.apache.hadoop.mapreduce.MiniHadoopClusterManager.run(MiniHadoopClusterManager.java:132)
> at
> org.apache.hadoop.mapreduce.MiniHadoopClusterManager.main(MiniHadoopClusterManager.java:320)
> Caused by: java.lang.ClassNotFoundException: org.junit.Assert
> at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
> ... 8 more
> {noformat}
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