As of Java 1.7 implementations of JDBC interfaces Connection, Statement, PreparedStatement, CallableStatement and ResulSet must implement the AutoCloseable interface with method close(). This method is invoked automatically on objects managed by the try-with-resources statement. See http://docs.oracle.com/javase/7/docs/technotes/guides/language/try-with-resources.html http://docs.oracle.com/javase/7/docs/api/java/lang/AutoCloseable.html http://docs.oracle.com/javase/7/docs/api/java/sql/Connection.html http://docs.oracle.com/javase/7/docs/api/java/sql/Statement.html http://docs.oracle.com/javase/7/docs/api/java/sql/PreparedStatement.html http://docs.oracle.com/javase/7/docs/api/java/sql/CallableStatement.html http://docs.oracle.com/javase/7/docs/api/java/sql/ResultSet.html

--- a/src/main/java/nl/cwi/monetdb/jdbc/MonetConnection.java
+++ b/src/main/java/nl/cwi/monetdb/jdbc/MonetConnection.java
@@ -72,7 +72,10 @@ import nl.cwi.monetdb.mcl.parser.StartOf
  * @author Martin van Dinther
  * @version 1.3
  */
-public class MonetConnection extends MonetWrapper implements Connection {
+public class MonetConnection
+	extends MonetWrapper
+	implements Connection, AutoCloseable
+{
 	/** the successful processed input properties */
 	private final Properties conn_props = new Properties();