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java.lang.IllegalThreadStateException: null at java.lang.Thread.start(Thread.java:705)[na:1.8.0_25] at com.mongodb.connection.DefaultServerMonitor.invalidate(DefaultServerMonitor.java:88)[mongo-java-driver-3.2.2.jar:na] at com.mongodb.connection.DefaultServer.invalidate(DefaultServer.java:120)[mongo-java-driver-3.2.2.jar:na] at com.mongodb.connection.DefaultServer.handleThrowable(DefaultServer.java:150)[mongo-java-driver-3.2.2.jar:na] at com.mongodb.connection.DefaultServer.access$500(DefaultServer.java:38)[mongo-java-driver-3.2.2.jar:na] at com.mongodb.connection.DefaultServer$DefaultServerProtocolExecutor.execute(DefaultServer.java:161)[mongo-java-driver-3.2.2.jar:na] at com.mongodb.connection.DefaultServerConnection.executeProtocol(DefaultServerConnection.java:286)[mongo-java-driver-3.2.2.jar:na] at com.mongodb.connection.DefaultServerConnection.query(DefaultServerConnection.java:209)[mongo-java-driver-3.2.2.jar:na] at com.mongodb.operation.FindOperation$1.call(FindOperation.java:496)[mongo-java-driver-3.2.2.jar:na] at com.mongodb.operation.FindOperation$1.call(FindOperation.java:482)[mongo-java-driver-3.2.2.jar:na] at com.mongodb.operation.OperationHelper.withConnectionSource(OperationHelper.java:239)[mongo-java-driver-3.2.2.jar:na] at com.mongodb.operation.OperationHelper.withConnection(OperationHelper.java:212)[mongo-java-driver-3.2.2.jar:na] at com.mongodb.operation.FindOperation.execute(FindOperation.java:482)[mongo-java-driver-3.2.2.jar:na] at com.mongodb.operation.FindOperation.execute(FindOperation.java:79)[mongo-java-driver-3.2.2.jar:na] at com.mongodb.Mongo.execute(Mongo.java:772)[mongo-java-driver-3.2.2.jar:na] at com.mongodb.Mongo$2.execute(Mongo.java:759)[mongo-java-driver-3.2.2.jar:na] at com.mongodb.DBCursor.initializeCursor(DBCursor.java:851)[mongo-java-driver-3.2.2.jar:na] at com.mongodb.DBCursor.hasNext(DBCursor.java:152)[mongo-java-driver-3.2.2.jar:na]