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java.lang.NullPointerException: 	at java.lang.ProcessBuilder.start(ProcessBuilder.java:1012)	at org.apache.hadoop.util.Shell.runCommand(Shell.java:483)	at org.apache.hadoop.util.Shell.run(Shell.java:456)	at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:722)	at org.apache.hadoop.util.Shell.execCommand(Shell.java:815)	at org.apache.hadoop.util.Shell.execCommand(Shell.java:798)	at org.apache.hadoop.security.ShellBasedUnixGroupsMapping.getUnixGroups(ShellBasedUnixGroupsMapping.java:84)	at org.apache.hadoop.security.ShellBasedUnixGroupsMapping.getGroups(ShellBasedUnixGroupsMapping.java:52)	at org.apache.hadoop.security.JniBasedUnixGroupsMappingWithFallback.getGroups(JniBasedUnixGroupsMappingWithFallback.java:51)	at org.apache.hadoop.security.Groups$GroupCacheLoader.fetchGroupList(Groups.java:239)	at org.apache.hadoop.security.Groups$GroupCacheLoader.load(Groups.java:220)	at org.apache.hadoop.security.Groups$GroupCacheLoader.load(Groups.java:208)	at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3599)	at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2379)	at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2342)	at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2257)	at com.google.common.cache.LocalCache.get(LocalCache.java:4000)	at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:4004)	at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4874)	at org.apache.hadoop.security.Groups.getGroups(Groups.java:182)	at org.apache.solr.cloud.TestSolrCloudWithSecureImpersonation.getUsersFirstGroup(TestSolrCloudWithSecureImpersonation.java:64)	at org.apache.solr.cloud.TestSolrCloudWithSecureImpersonation.getImpersonatorSettings(TestSolrCloudWithSecureImpersonation.java:86)	at org.apache.solr.cloud.TestSolrCloudWithSecureImpersonation.startup(TestSolrCloudWithSecureImpersonation.java:99)	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 com.carrotsearch.randomizedtesting.RandomizedRunner.invoke(RandomizedRunner.java:1764)	at com.carrotsearch.randomizedtesting.RandomizedRunner$6.evaluate(RandomizedRunner.java:811)	at com.carrotsearch.randomizedtesting.RandomizedRunner$7.evaluate(RandomizedRunner.java:827)	at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)	at com.carrotsearch.randomizedtesting.rules.SystemPropertiesRestoreRule$1.evaluate(SystemPropertiesRestoreRule.java:57)	at org.apache.lucene.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:45)	at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)	at org.apache.lucene.util.TestRuleStoreClassName$1.evaluate(TestRuleStoreClassName.java:41)	at com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:40)	at com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:40)	at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)	at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)	at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)	at org.apache.lucene.util.TestRuleAssertionsRequired$1.evaluate(TestRuleAssertionsRequired.java:53)	at org.apache.lucene.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:47)	at org.apache.lucene.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:64)	at org.apache.lucene.util.TestRuleIgnoreTestSuites$1.evaluate(TestRuleIgnoreTestSuites.java:54)	at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)	at com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:367)	at java.lang.Thread.run(Thread.java:745)