NullPointerException thrown for illegal port numbers
----------------------------------------------------

                 Key: XMLRPC-186
                 URL: https://issues.apache.org/jira/browse/XMLRPC-186
             Project: XML-RPC
          Issue Type: Bug
          Components: Source
    Affects Versions: 3.1.3
            Reporter: Fredrik Wendt
            Priority: Minor


When you try to use an XmlRpcClient with an address containing an illegal port 
number (>65535), you get a {{NullPointerException}}. After debugging I see that 
the constructor call to {{java.net.InetSocketAddress}} throws a good exception: 
IllegalArgumentException("port out of range"), but this is silently ignored and 
null is returned from {{ReflectionSocketFactory}}.
I suggest adding:
{{if (cause instanceof IllegalArgumentException) {
  throw (IllegalArgumentException) cause;
}
}}
to give users of XmlRpcClient better error messages.

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