java.lang.IllegalStateException: state should be: open
at com.mongodb.assertions.Assertions.isTrue(Assertions.java:70)
at com.mongodb.connection.BaseCluster.selectServer(BaseCluster.java:82)
at com.mongodb.binding.ClusterBinding$ClusterBindingConnectionSource.<init>(ClusterBinding.java:75)
at com.mongodb.binding.ClusterBinding$ClusterBindingConnectionSource.<init>(ClusterBinding.java:71)
at com.mongodb.binding.ClusterBinding.getReadConnectionSource(ClusterBinding.java:63)
at com.mongodb.operation.OperationHelper.withConnection(OperationHelper.java:402)
at com.mongodb.operation.FindOperation.execute(FindOperation.java:510)
at com.mongodb.operation.FindOperation.execute(FindOperation.java:81)
at com.mongodb.Mongo.execute(Mongo.java:836)
at com.mongodb.Mongo$2.execute(Mongo.java:823)
at com.mongodb.OperationIterable.iterator(OperationIterable.java:47)
at com.mongodb.FindIterableImpl.iterator(FindIterableImpl.java:151)
at framework.yaomy.mongo.pool.DBCursor.hasNext(DBCursor.java:53)
at framework.yaomy.mongo.pool.DBCollection.findOne(DBCollection.java:198)
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