Summary
-------
The behaviour of the send methods for DatagramSocket, MulticastSocket, DatagramChannel and DatagramSocketAdaptor are not always consistent when given a DatagramPacket with invalid details. The specification of DatagramSocket/MulticastSocket doesn't cover all the cases.  

Problem
-------

Each of the Socket types described above throw different exceptions when supplied with a DatagramPacket with an invalid port number (negative or greater than 0xFFFF). 

Solution
--------
Specify that IllegalArgumentException should be thrown is the supplied port is out of range. This is what the `DatagramChannel::socket` already does, but the behavior of DatagramSocket and MulticastSocket is currently system dependent. The solution proposed here is to align the behavior of DatagramSocket and MulticastSocket `send` methods to that of `connect(InetAddress, port)` and throw IllegalArgumentException premptively before calling the underlying native implementation. This will also align the behavior of DatagramSocket and MulticastSocket to that of the `DatagramChannel::socket` adapter.

Specification
-------------
java/net/DatagramSocket.java

          * @throws     IllegalArgumentException if the socket is connected,
          *             and connected address and packet address differ, or
          *             if the socket is not connected and the packet address
    -     *             is not set.
    +     *             is not set or if its port is out of range.
          *
          * @see        java.net.DatagramPacket
          * @see        SecurityManager#checkMulticast(InetAddress)
          * @see        SecurityManager#checkConnect
          * @revised 1.4
          * @spec JSR-51
          */
         public void send(DatagramPacket p) throws IOException  {

java/net/MulticastSocket.java

         * @throws     IllegalArgumentException if the socket is connected,
         *             and connected address and packet address differ, or
         *             if the socket is not connected and the packet address
    -    *             ls not set.
    +    *             is not set or if its port is out of range.
         *
         *
         * @deprecated Use the following code or its equivalent instead:
         *  ......
         *  int ttl = mcastSocket.getTimeToLive();
         *  mcastSocket.setTimeToLive(newttl);
         *  mcastSocket.send(p);
         *  mcastSocket.setTimeToLive(ttl);
         *  ......
         *
         * @see DatagramSocket#send
         * @see DatagramSocket#receive
         * @see SecurityManager#checkMulticast(java.net.InetAddress, byte)
         * @see SecurityManager#checkConnect
         */
        @Deprecated
        public void send(DatagramPacket p, byte ttl)