java.lang.AssertionError: expected null, but was:<javax.management.openmbean.CompositeDataSupport(compositeType=javax.management.openmbean.CompositeType(name=org.apache.hadoop.hdfs.protocol.RollingUpgradeInfo$Bean,items=((itemName=blockPoolId,itemType=javax.management.openmbean.SimpleType(name=java.lang.String)),(itemName=createdRollbackImages,itemType=javax.management.openmbean.SimpleType(name=java.lang.Boolean)),(itemName=finalizeTime,itemType=javax.management.openmbean.SimpleType(name=java.lang.Long)),(itemName=startTime,itemType=javax.management.openmbean.SimpleType(name=java.lang.Long)))),contents={blockPoolId=BP-2750152-67.195.81.153-1451894542455, createdRollbackImages=true, finalizeTime=0, startTime=1451894544449})>

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Samebug tips

  1. ,

    My guess is there is some kind of static state in the code being tested or in the test itself, so the tests aren't isolated. Adding the test changes the test order. In any case, your best course of action is to use the debugger to see why the tests fail.

  2. ,

    Check your assert declaration and the method implementation with the condition.

Solutions on the web

via hadoop-hdfs-dev by Apache Jenkins Server, 1 year ago
=startTime,itemType=javax.management.openmbean.SimpleType(name=java.lang.Long)))),contents={blockPoolId=BP-2750152-67.195.81.153-1451894542455, createdRollbackImages=true, finalizeTime=0, startTime=1451894544449})>
via hadoop-hdfs-dev by Apache Jenkins Server, 1 year ago
expected null, but was:<javax.management.openmbean.CompositeDataSupport(compositeType=javax.management.openmbean.CompositeType(name=org.apache.hadoop.hdfs.protocol.RollingUpgradeInfo$Bean,items=((itemName=blockPoolId,itemType
via hadoop-hdfs-dev by Apache Jenkins Server, 1 year ago
expected null, but was:<javax.management.openmbean.CompositeDataSupport(compositeType=javax.management.openmbean.CompositeType(name=org.apache.hadoop.hdfs.protocol.RollingUpgradeInfo$Bean,items=((itemName=blockPoolId,itemType
via GitHub by egonw
, 1 year ago
expected null, but was:<>
via GitHub by nishantmonu51
, 1 year ago
expected null, but was:<2,2,1461091070509,1461091070509,0,2,0,0,11,0,5 >
via GitHub by pjain1
, 2 years ago
expected null, but was:<10,10,1447436227166,1447436227166,0,0,0,94859180405555201,25,0,10>
java.lang.AssertionError: expected null, but was:<javax.management.openmbean.CompositeDataSupport(compositeType=javax.management.openmbean.CompositeType(name=org.apache.hadoop.hdfs.protocol.RollingUpgradeInfo$Bean,items=((itemName=blockPoolId,itemType=javax.management.openmbean.SimpleType(name=java.lang.String)),(itemName=createdRollbackImages,itemType=javax.management.openmbean.SimpleType(name=java.lang.Boolean)),(itemName=finalizeTime,itemType=javax.management.openmbean.SimpleType(name=java.lang.Long)),(itemName=startTime,itemType=javax.management.openmbean.SimpleType(name=java.lang.Long)))),contents={blockPoolId=BP-2750152-67.195.81.153-1451894542455, createdRollbackImages=true, finalizeTime=0, startTime=1451894544449})>	at org.junit.Assert.fail(Assert.java:88)	at org.junit.Assert.failNotNull(Assert.java:664)	at org.junit.Assert.assertNull(Assert.java:646)	at org.junit.Assert.assertNull(Assert.java:656)	at org.apache.hadoop.hdfs.TestRollingUpgrade.checkMxBeanIsNull(TestRollingUpgrade.java:294)	at org.apache.hadoop.hdfs.TestRollingUpgrade.testRollback(TestRollingUpgrade.java:323)