com.microsoft.sqlserver.jdbc.SQLServerException: The connection is closed.

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The TCP/IP connection to the host has failed. java.net.UnknownHostException:
com.microsoft.sqlserver.jdbc.SQLServerException: The connection is closed.
at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(Unknown Source)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.checkClosed(Unknown Source)
at com.microsoft.sqlserver.jdbc.SQLServerStatement.checkClosed(Unknown Source)
at com.microsoft.sqlserver.jdbc.SQLServerResultSet.checkClosed(Unknown Source)
at com.microsoft.sqlserver.jdbc.SQLServerResultSet.next(Unknown Source)
at undefined.Boom.MaakBoomStructuur(Boom.java:241)
at undefined.Boom.access$0(Boom.java:110)
at undefined.Boom$2.run(Boom.java:74)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)

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