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Properly Catching an Unknown Host exception  RSS feed

 
Tristan Havelick
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I am writing a front end for telneting directly into pop mail servers that I have a couple small, but related bugs in.
First let me explain how the program works a little bit. You can get the source code here: RawMail.java The main class, RawMail handles all the GUI, event trapping etc. The NetThread class extends Thread and handles all the socket related code.
The Problem
when someone types a non-existant server, the program throws a UnknownHostException. This exception is thrown in NetTread after the Connect button is disabled. Cuerrently I catch the exception in the NetThread code; which means I can't put the button disabling code in the same try clause. to remedy this I would just throw the exception up to the GUI code but I cant because the socket is opened in NetTread's run() method, so I can't write
public void run() throws UnkownHostExeception
how can I get around this?
Second:
for debuging purposes, I commented out the code that disables the 'connect' button. If the user types a non-existent host, it throws (and catches) an UnknownHostException. The strange part is if the user then puts in a valid host the second time the connect button does nothing! why?
Thanks in advance,
=-<Tristan>
 
Tristan Havelick
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I solved it myself! Basically I created a method checkHost(String host) that used InrtAddres.getByName(host). ... ok I stole it from a book, but it seems to work. I'm still not sure what was causing the second problem, but this seems to have bypassed it.
 
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