2019-03-30 04:33:50,166 ERROR ratis.MiniRaftCluster (MiniRaftCluster.java:runWithNewCluster(122)) - Failed org.apache.ratis.MiniRaftCluster$Factory$Get.runWithNewCluster(MiniRaftCluster.java:107)
java.lang.NullPointerException
at org.apache.ratis.MiniRaftCluster.toRaftPeer(MiniRaftCluster.java:384)
at org.apache.ratis.MiniRaftCluster.removePeers(MiniRaftCluster.java:431)
at org.apache.ratis.server.impl.RaftReconfigurationBaseTest.runTestAddRemovePeers(RaftReconfigurationBaseTest.java:128)
at org.apache.ratis.server.impl.RaftReconfigurationBaseTest.lambda$testLeaderStepDown$3(RaftReconfigurationBaseTest.java:121)
at org.apache.ratis.MiniRaftCluster$Factory$Get.runWithNewCluster(MiniRaftCluster.java:119)
at org.apache.ratis.MiniRaftCluster$Factory$Get.runWithNewCluster(MiniRaftCluster.java:107)
at org.apache.ratis.server.impl.RaftReconfigurationBaseTest.testLeaderStepDown(RaftReconfigurationBaseTest.java:121)
...