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java.sql.SQLException: JZ0C0: Connection is already closed.	at com.sybase.jdbc3.jdbc.ErrorMessage.raiseError(ErrorMessage.java:572)	at com.sybase.jdbc3.jdbc.SybConnection.checkConnection(SybConnection.java:2204)	at com.sybase.jdbc3.jdbc.SybConnection.close(SybConnection.java:1139)	at Test.main(Test.java:18)