我在生产中有一个 DSE 6 集群，一切正常。
最近我想在上面插入datastax studio的第6版。
我使用 ssl 和身份验证正确配置了连接，并且连接测试成功。
问题是 DSE Studio 似乎无法从服务器获取架构。
我正在使用 Oracle 的最后一个 java 版本，并为 JCE 配置了用于 java 8 的 jce 无限强度管辖策略文件。
我在工作室日志中有这个错误：
23:02:22.740 [Studio-akka.actor.default-dispatcher-12] ERROR
com.datastax.studio.client.SchemaManager ID: TS: - Unexpected exception getting cql schema for connection null: java.lang.NullPointerException
23:02:22.744 [Studio-akka.actor.default-dispatcher-42] WARN com.datastax.studio.streaming.websocket.CQLSchemaBroadcaster ID: TS: - Schema stream provider got null cql schema
23:02:22.740 [Studio-akka.actor.default-dispatcher-32] ERROR com.datastax.studio.application.EventuateEventBus ID: TS: - Unhandled exception during publishing (event=SparkSQLConnectionClosed(connectionId=null), listener=com.datastax.studio.client.SchemaManager$$Lambda$71/1502197135@4121ef79):
java.lang.NullPointerException: null
at java.util.concurrent.ConcurrentHashMap.replaceNode(ConcurrentHashMap.java:1106) ~[?:1.8.0_161]
at java.util.concurrent.ConcurrentHashMap.remove(ConcurrentHashMap.java:1097) ~[?:1.8.0_161]
at com.datastax.studio.client.SchemaManager.stopSparkSqlSchemaRefresh(SchemaManager.java:473) ~[classes/:?]
at com.datastax.studio.client.SchemaManager.lambda$init$5(SchemaManager.java:181) ~[classes/:?]
at com.datastax.studio.application.EventuateEventBus$EventListenerActor.lambda$new$0(EventuateEventBus.java:116) ~[classes/:?]
at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:26) [akka-actor_2.11-2.4.17.jar:?]
at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:21) [akka-actor_2.11-2.4.17.jar:?]
at scala.PartialFunction$class.applyOrElse(PartialFunction.scala:123) [scala-library-2.11.8.jar:?]
at akka.japi.pf.UnitCaseStatement.applyOrElse(CaseStatements.scala:21) [akka-actor_2.11-2.4.17.jar:?]
at scala.PartialFunction$OrElse.apply(PartialFunction.scala:167) [scala-library-2.11.8.jar:?]
at com.rbmhtechnology.eventuate.EventsourcedView$class.receiveEvent(EventsourcedView.scala:227) [eventuate-core_2.11-0.8.1.jar:0.8.1]
at com.rbmhtechnology.eventuate.AbstractEventsourcedActor.com$rbmhtechnology$eventuate$ConfirmedDelivery$$super$receiveEvent(AbstractEventsourcedActor.scala:32) [eventuate-core_2.11-0.8.1.jar:0.8.1]
at com.rbmhtechnology.eventuate.ConfirmedDelivery$class.receiveEvent(ConfirmedDelivery.scala:83) [eventuate-core_2.11-0.8.1.jar:0.8.1]
at com.rbmhtechnology.eventuate.AbstractEventsourcedActor.com$rbmhtechnology$eventuate$PersistOnEvent$$super$receiveEvent(AbstractEventsourcedActor.scala:32) [eventuate-core_2.11-0.8.1.jar:0.8.1]
at com.rbmhtechnology.eventuate.PersistOnEvent$class.receiveEvent(PersistOnEvent.scala:79) [eventuate-core_2.11-0.8.1.jar:0.8.1]
at com.rbmhtechnology.eventuate.AbstractEventsourcedActor.receiveEvent(AbstractEventsourcedActor.scala:32) [eventuate-core_2.11-0.8.1.jar:0.8.1]
at com.rbmhtechnology.eventuate.EventsourcedView$$anonfun$initiated$1.applyOrElse(EventsourcedView.scala:457) [eventuate-core_2.11-0.8.1.jar:0.8.1]
at akka.actor.Actor$class.aroundReceive(Actor.scala:497) [akka-actor_2.11-2.4.17.jar:?]
at com.rbmhtechnology.eventuate.AbstractEventsourcedView.aroundReceive(AbstractEventsourcedView.scala:55) [eventuate-core_2.11-0.8.1.jar:0.8.1]
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526) [akka-actor_2.11-2.4.17.jar:?]
at akka.actor.ActorCell.invoke(ActorCell.scala:495) [akka-actor_2.11-2.4.17.jar:?]
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257) [akka-actor_2.11-2.4.17.jar:?]
at akka.dispatch.Mailbox.run(Mailbox.scala:224) [akka-actor_2.11-2.4.17.jar:?]
at akka.dispatch.Mailbox.exec(Mailbox.scala:234) [akka-actor_2.11-2.4.17.jar:?]
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260) [scala-library-2.11.8.jar:?]
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339) [scala-library-2.11.8.jar:?]
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979) [scala-library-2.11.8.jar:?]
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107) [scala-library-2.11.8.jar:?]
在服务器端，日志中没有什么特别之处。
你知道问题可能是什么吗？