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POJava - Closing socket when reloading class
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  1. POJava - Closing socket when reloading class
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    copied!<p>So I'm working on a server for an IRC, and I added a config screen where you can edit the port it is using, but I have to reintialize the <code>Listen</code> class for it to take effect, so I have this in my Config class:</p> <pre><code>Listen.closePorts(); new Listen(); </code></pre> <p>And here is my Listen class:</p> <pre><code>package server.network; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.net.ServerSocket; import java.net.Socket; import server.Server; import server.gui.GUIMain; public class Listen { private static Socket socket = null; private int port; public Listen() { try { port = Server.listenPort; @SuppressWarnings("resource") ServerSocket serverSocket = new ServerSocket(port); GUIMain.jta.append("\nServer Started and listening for messages on port " + port + ".\n"); while(true) { socket = serverSocket.accept(); InputStream is = socket.getInputStream(); InputStreamReader isr = new InputStreamReader(is); BufferedReader br = new BufferedReader(isr); String msg = br.readLine(); GUIMain.jta.append("Received message from client: " + msg + "\n"); } } catch (Exception e) { GUIMain.jta.append("Port " + port + " already in use!\n"); } finally { try { socket.close(); } catch(Exception e) { } } } public static void closePorts() { try { socket.close(); GUIMain.jta.append("Server closed\n"); } catch (IOException e) { } } } </code></pre> <p>When I start the application it runs this class, opening the socket with the port specified, but when I try to close the port here:</p> <pre><code>public static void closePorts() { try { socket.close(); GUIMain.jta.append("Server closed\n"); } catch (IOException e) { } } </code></pre> <p>It hangs on <code>socket.close();</code></p> <p>And if I comment <code>Listen.closePorts();</code> out and try to reload the class and leaving the socket open it either hangs or runs the <code>catch()</code> if the port is the same as the port that is in use.</p> <p>So long story short, How can I close the socket before reintalizing the class and use the new port?</p> <p>Here's the full exception it trows:</p> <pre><code>java.lang.NullPointerException at server.network.Listen.closePorts(Listen.java:44) at server.gui.GUISettings.actionPerformed(GUISettings.java:86) at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.setPressed(Unknown Source) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source) at java.awt.Component.processMouseEvent(Unknown Source) at javax.swing.JComponent.processMouseEvent(Unknown Source) at java.awt.Component.processEvent(Unknown Source) at java.awt.Container.processEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Window.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.EventQueue.dispatchEventImpl(Unknown Source) at java.awt.EventQueue.access$200(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source) </code></pre>
 

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