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java.lang.NullPointerException: 	at org.apache.hadoop.hdfs.MiniDFSCluster.startDataNodes(MiniDFSCluster.java:425)	at org.apache.hadoop.hdfs.MiniDFSCluster.(MiniDFSCluster.java:283)	at org.apache.commons.vfs2.provider.hdfs.test.HdfsFileProviderTest.(HdfsFileProviderTest.java:95)	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.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27)	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:30)	at org.junit.runners.ParentRunner.run(ParentRunner.java:300)	at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)	at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)	at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)	at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)	at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)	at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)