nonCloseableConnection.java

Connection nonCloseableConnection = (Connection)Proxy.newProxyInstance( Connection.class.getClassLoader(),
          new Class[] { Connection.class },
          (proxy, method, methodArgs) -> {
              if (method.getName().equals("close")) {
                  return null;
              } else {
                  return method.invoke( alreadyExistingConnection, methodArgs );
              }
          } );