There is no need in establishing connection, provider is available from
InitialContext object:

  Context ctx = new InitialContext();

  Provider pr = ctx.getProvider("jms/MyProvider");

Via InitialContext object:

  Context ctx = new InitialContext();

  Connection connection = (Connection)ctx.getConnection("jms/MyConnection");

Via JNDI lookup:

  Context ctx = new InitialContext();

  Connection connection = (Connection)ctx.lookup("jms/MyConnection");

Via connection factory object:

  Connection connection = connectionFactory.createConnection();

Via JMSContext object:

  Context ctx = new JMSContext();

  Connection connection = (Connection)ctx.getConnection("jms/MyConnection");