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java.lang.NullPointerException: 	at com.fasterxml.jackson.core.JsonFactory.createParser(JsonFactory.java:822)	at com.fasterxml.jackson.databind.ObjectReader.readValue(ObjectReader.java:896)	at org.springframework.xd.dirt.stream.zookeeper.ZooKeeperStreamDefinitionRepository.findOne(ZooKeeperStreamDefinitionRepository.java:157)	at org.springframework.xd.dirt.stream.zookeeper.ZooKeeperStreamDefinitionRepository.findOne(ZooKeeperStreamDefinitionRepository.java:56)	at org.springframework.xd.dirt.stream.dsl.StreamConfigParser.lookupStream(StreamConfigParser.java:654)	at org.springframework.xd.dirt.stream.dsl.ChannelNode.resolve(ChannelNode.java:144)	at org.springframework.xd.dirt.stream.dsl.SourceChannelNode.resolve(SourceChannelNode.java:54)	at org.springframework.xd.dirt.stream.dsl.StreamNode.resolve(StreamNode.java:125)	at org.springframework.xd.dirt.stream.dsl.StreamConfigParser.parse(StreamConfigParser.java:110)	at org.springframework.xd.dirt.stream.XDStreamParser.parse(XDStreamParser.java:121)	at org.springframework.xd.dirt.stream.StreamFactory.createStream(StreamFactory.java:84)	at org.springframework.xd.dirt.server.admin.deployment.zk.DeploymentLoader.loadStream(DeploymentLoader.java:101)	at org.springframework.xd.dirt.server.admin.deployment.zk.DefaultDeploymentStateRecalculator.recalculateStreamStates(DefaultDeploymentStateRecalculator.java:96)	at org.springframework.xd.dirt.server.admin.deployment.zk.DefaultDeploymentStateRecalculator.onSupervisorElected(DefaultDeploymentStateRecalculator.java:182)	at org.springframework.xd.dirt.server.admin.deployment.zk.DeploymentSupervisor$LeaderListener.takeLeadership(DeploymentSupervisor.java:468)	at org.apache.curator.framework.recipes.leader.LeaderSelector$WrappedListener.takeLeadership(LeaderSelector.java:536)	at org.apache.curator.framework.recipes.leader.LeaderSelector.doWork(LeaderSelector.java:398)	at org.apache.curator.framework.recipes.leader.LeaderSelector.doWorkLoop(LeaderSelector.java:443)	at org.apache.curator.framework.recipes.leader.LeaderSelector.access$100(LeaderSelector.java:63)	at org.apache.curator.framework.recipes.leader.LeaderSelector$2.call(LeaderSelector.java:244)	at org.apache.curator.framework.recipes.leader.LeaderSelector$2.call(LeaderSelector.java:238)	at java.util.concurrent.FutureTask.run(FutureTask.java:262)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)	at java.util.concurrent.FutureTask.run(FutureTask.java:262)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:745)