jon-wei commented on issue #7015: [Issue #6967] NoClassDefFoundError when using 
druid-hdfs-storage
URL: https://github.com/apache/incubator-druid/pull/7015#issuecomment-461207328
 
 
   There are some real UT failures:
   
   ```
   org.apache.druid.segment.loading.HdfsDataSegmentFinderTest  Time elapsed: 
2.25 sec  <<< ERROR!
   java.lang.NoClassDefFoundError: org/apache/hadoop/net/StaticMapping
        at 
org.apache.hadoop.hdfs.MiniDFSCluster.initMiniDFSCluster(MiniDFSCluster.java:807)
        at org.apache.hadoop.hdfs.MiniDFSCluster.<init>(MiniDFSCluster.java:485)
        at 
org.apache.hadoop.hdfs.MiniDFSCluster$Builder.build(MiniDFSCluster.java:444)
        at 
org.apache.druid.segment.loading.HdfsDataSegmentFinderTest.setupStatic(HdfsDataSegmentFinderTest.java:148)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
        at 
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
        at 
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
        at 
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
        at 
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
        at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:367)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:274)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:238)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:161)
        at 
org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:290)
        at 
org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:242)
        at 
org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:121)
   Caused by: java.lang.ClassNotFoundException: 
org.apache.hadoop.net.StaticMapping
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 21 more
   ```
   
   Maybe some adjustment is needed for hadoop-common dependency in test scope

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