Connection.isClosed throws NullPointerException or returns false after close ---------------------------------------------------------------------------- Key: JBTM-2798 URL: https://issues.jboss.org/browse/JBTM-2798 Project: JBoss Transaction Manager Issue Type: Bug Affects Versions: 5.4.0.Final Reporter: Mirko Streckenbach The following snippet fails with a NullPointerException: {code} Connection c = ConnectionManager.create(dbUrl, properties); System.err.println("closed1=" + c.isClosed()); c.close(); System.err.println("closed2=" + c.isClosed()); {code} output: {code} closed1=false java.lang.NullPointerException at com.arjuna.ats.internal.jdbc.ConnectionImple.closeImpl(ConnectionImple.java:389) at com.arjuna.ats.internal.jdbc.ConnectionImple.close(ConnectionImple.java:381) at org.jboss.narayana.quickstarts.jta.Main.main(Main.java:140) {code} If it is modified to "use" the init the physical connect before closing, it will not throw an exception, but returns false for isClosed after the close: {code} Connection c = ConnectionManager.create(dbUrl, properties); System.err.println("closed1=" + c.isClosed()); c.createStatement().close(); System.err.println("closed2=" + c.isClosed()); c.close(); System.err.println("closed3=" + c.isClosed()); {code} output: {code} closed1=false closed2=false closed3=false {code}