IllegalStateException thrown incorrectly

[ChrisGreenaway]

PassthroughCommunicatorService.closeClientConnection should not throw IllegalStateException - it should throw nothing.
PassthroughInvocationBuilder.invoke should not throw IllegalStateException - it should throw ConnectionClosedException.

Exception in thread "LeaseMonitorThread" java.lang.IllegalStateException: Connection already closed
at org.terracotta.passthrough.PassthroughConnection.close(PassthroughConnection.java:379)
at org.terracotta.passthrough.PassthroughCommunicatorService.closeClientConnection(PassthroughCommunicatorService.java:50)
at org.terracotta.lease.service.closer.ClientConnectionCloserImpl.closeClientConnection(ClientConnectionCloserImpl.java:35)
at org.terracotta.lease.service.closer.ProxyClientConnectionCloser.closeClientConnection(ProxyClientConnectionCloser.java:43)
at org.terracotta.lease.service.monitor.LeaseState.checkLease(LeaseState.java:113)
at org.terracotta.lease.service.monitor.LeaseState.checkLeases(LeaseState.java:87)
at org.terracotta.lease.service.monitor.LeaseMonitorThread.run(LeaseMonitorThread.java:40)

Exception in thread "LeaseMaintenanceThread" java.lang.IllegalStateException: Connection already closed
at org.terracotta.passthrough.PassthroughServerProcess.sendMessageToServer(PassthroughServerProcess.java:397)
at org.terracotta.passthrough.PassthroughConnectionState.createAndSend(PassthroughConnectionState.java:77)
at org.terracotta.passthrough.PassthroughConnectionState.sendNormal(PassthroughConnectionState.java:63)
at org.terracotta.passthrough.PassthroughConnection.invokeAndWait(PassthroughConnection.java:160)
at org.terracotta.passthrough.PassthroughConnection.invokeActionAndWaitForAcks(PassthroughConnection.java:152)
at org.terracotta.passthrough.PassthroughInvocationBuilder.invoke(PassthroughInvocationBuilder.java:113)
at org.terracotta.lease.LeaseAcquirerImpl.acquireLease(LeaseAcquirerImpl.java:33)
at org.terracotta.lease.LeaseMaintainerImpl.refreshLease(LeaseMaintainerImpl.java:57)
at org.terracotta.lease.LeaseMaintenanceThread.run(LeaseMaintenanceThread.java:38)