"The connection is closed" / "Closed Connection" exception raised by JDBC driver deployed in JBoss EAP

Issue

• JDBC driver raises an exception like the below indicating connection closure:

  Microsoft SQL Server

  ... com.microsoft.sqlserver.jdbc.SQLServerException: The connection is closed.
      ...
      at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(SQLServerException.java:...)
      at com.microsoft.sqlserver.jdbc.SQLServerConnection.checkClosed(SQLServerConnection.java:...)
      at com.microsoft.sqlserver.jdbc.SQLServerStatement.checkClosed(SQLServerStatement.java:...)
  

  ... com.microsoft.sqlserver.jdbc.SQLServerException: The connection is closed.
      at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(SQLServerException.java:...)
      at com.microsoft.sqlserver.jdbc.SQLServerConnection.checkClosed(SQLServerConnection.java:...)
      at com.microsoft.sqlserver.jdbc.SQLServerConnection.prepareStatement(SQLServerConnection.java:...)
  

  Oracle

  ... java.sql.SQLRecoverableException: Closed Connection
      at oracle.jdbc.driver.PhysicalConnection.createStatement(PhysicalConnection.java:3423)
      ...
  

  ... java.sql.SQLRecoverableException: Closed Connection
      at oracle.jdbc.driver.PhysicalConnection.setAutoCommit(PhysicalConnection.java:2232)
      ...
  

  ...  java.sql.SQLException: Closed Connection
      ...
      at oracle.jdbc.driver.PhysicalConnection.prepareStatement(PhysicalConnection.java:868)
  

  PostgreSQL

  ...  org.postgresql.util.PSQLException: Connection has been closed.
   at org.postgresql@xx.xx.xx//org.postgresql.ds.PGPooledConnection$ConnectionHandler.invoke(PGPooledConnection.java:326)
   ...