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POHandling exceptions Java
 

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  1. POHandling exceptions Java
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    <p>I am trying to make a chat server that communicates with my Minecraft client and that worked fine but I can not get the client to work with the server. This is the client </p> <pre><code>public class ClientChatHandler { public static ObjectOutputStream output; public static ObjectInputStream input; public static String message = ""; public static String serverIP = "localhost"; public static Socket connection; } public ClientChatHandler(String host){ serverIP = host; } public static void startRunning(){ try{ connectToServer(); setupStreams(); whileChatting(); } catch(EOFException eofException){ Minecraft.getMinecraft().thePlayer.addChatMessage(Variables.color + "\247a[Server] Client terminated the connection."); } catch(IOException ioException){ ioException.printStackTrace(); } } public static void connectToServer() throws IOException{ Minecraft.getMinecraft().thePlayer.addChatMessage(Variables.color + "\247a[Server] Attempting to connect."); connection = new Socket(InetAddress.getByName(serverIP), 1337); Minecraft.getMinecraft().thePlayer.addChatMessage(Variables.color + "\247a[Server] Connected to server."); } public static void setupStreams() throws IOException{ try{ output = new ObjectOutputStream(connection.getOutputStream()); output.flush(); input = new ObjectInputStream(connection.getInputStream()); } catch(NullPointerException Exception){ Minecraft.getMinecraft().thePlayer.addChatMessage(Variables.color + "\247a[Server] Error creating streams. Closing connection"); } catch(IOException ioException){ Minecraft.getMinecraft().thePlayer.addChatMessage(Variables.color + "\247a[Server] Error creating streams. Closing connection"); } } public static void whileChatting() throws IOException{ do{ try{ message = (String) input.readObject(); Minecraft.getMinecraft().thePlayer.addChatMessage(Variables.color + message); }catch(ClassNotFoundException classNotFoundException){ Minecraft.getMinecraft().thePlayer.addChatMessage(Variables.color + "\247a[Server] \2474ERROR! Connecting, closing sockets."); } }while(!message.equals("server - end")); } public static void closeCrap(){ Minecraft.getMinecraft().thePlayer.addChatMessage(Variables.color + "\247a[Server] Closing connection"); try{ output.close(); input.close(); connection.close(); }catch(IOException ioException){ ioException.printStackTrace(); } } public static void sendMessage(String message){ try{ output.writeObject(message); output.flush(); Minecraft.getMinecraft().thePlayer.addChatMessage(Variables.color + message); } catch(IOException ioException){ } } public static void showMessage(final String message){ Minecraft.getMinecraft().thePlayer.addChatMessage(Methods.getLetterColor(Variables.ChatName Color) + Minecraft.getMinecraft().thePlayer.username + "\2477:\247f " + message); } </code></pre> <p>Now I keep getting <code>java.lang.NullPointerException</code> of this:</p> <pre><code>output = new ObjectOutputStream(connection.getOutputStream()); output.flush(); input = new ObjectInputStream(connection.getInputStream()); </code></pre> <p>How can I resolve this problem?</p> <p>Sorry for the lack of information but minecraft crashes and I get a null pointer exception from the above code. </p> <p>Here's some text:</p> <pre><code> java.lang.NullPointerException at net.minecraft.src.ClientChatHandler.whileChatting(ClientChatHandler.Java:79) at org.renivivious.GuiConsole.mouseClicked(GuiConsole.java:671) at net.minecraft.src.GuiScreen.handleMouseInput(GuiScreen.java:198) at org.renivivious.GuiConsole.handleMouseInput(GuiConsole.java:356) at net.minecraft.src.GuiScreen.handleInput(GuiScreen.java:172) at net.minecraft.client.Minecraft.runTick(Minecraft.java:1394) at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:731) at net.minecraft.client.Minecraft.run(Minecraft.java:656) at java.lang.Thread.run(Unknown Source) --- END ERROR REPORT 8e0635c8 ---------- </code></pre>
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    1. PTQuestion
    1. USPeter O.
    1. USuser2278118
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      1. POHandling exceptions Java
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      1. VTApproveEditSuggestion
    1. COWhat exactly is the problem ? Any error messages ?
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      1. POHandling exceptions Java
      1. USCemre
    2. COExceptions are being handled, so what exception do you get?
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      1. POHandling exceptions Java
      1. USMr D
    3. COFrom what I see is that the line `new Socket(InetAddress.getByName(serverIP), 1337);` is throwing an IOException and thus its null (throwing an exception). Since you are catching the IOException (and sadly doing nothing :) you are missing the actual error. My suggestions is to put a break point at that line and see what exactly is the error. Or you can catch the IOException and print out the error message. You should always *do* something when you catch an exception.
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      1. USCemre
 

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