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POHandle exceptions without crashing socket server?
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Id
4443024
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AcceptedAnswerId
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AnswerCount
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CommentCount
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CommunityOwnedDate
CreationDate
2010-12-14T18:55:37.643
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LastActivityDate
2011-05-11T03:55:07.527
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Body
I am attempting to run a threaded socket server that handles multiple clients simultaneously. However after I telnet into the server and then exit in a non-graceful way, say by closing the window. The server crashes and returns <code>System.out.println("Runnable terminating with exception: " + e );</code> with <code>e</code> being <code>java.Lang.NullPointerException</code>. My question is how can I simply close the socket and keep the server running even if something goes wrong in <code>handleSession()</code>, so that others can connect? I am new to exceptions so my understand is still elementary. <pre><code>publc class ThreadedHandler implements Runnable { Socket incoming; BufferedReader in; PrintWriter out; SortedTopicList topics; ThreadedHandler(Socket s) { incoming = s; } public void run() { try { handleSession(incoming); }catch (Exception e) { System.out.println("Runnable terminating with exception: " + e ); } } public void handleSession(Socket client) { try { //Code goes here } catch (IOException e) { System.err.println(e.getMessage()); } finally { shutdown(); } } public void shutdown() { try { in.close(); out.close(); incoming.close(); } catch (Exception e) { System.err.println(e.getMessage()); } } } </code></pre> My main method is as follows: <pre><code>public class MessageBoardServer { public static void main(String[] args) { Thread t; try { ServerSocket ss = new ServerSocket(118118); while(true) { Socket session = ss.accept(); t = new Thread(new ThreadedHandler(session)); t.start(); } } catch (Exception e) { System.err.println(e.getMessage()); } } } </code></pre>
Tags
<java><multithreading><sockets><exception><nullpointerexception>
Title
Handle exceptions without crashing socket server?
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1. PO
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1. USAsh
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1. PO
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