CODEWITHSUNDEEP
java
Daniel
Daniel

Reputation: 101

Error with Java

Need some help here. I always get this error: 

ERROR! THREAD NAME: New I/O  worker #2
java.lang.NullPointerException
    at com.rs.game.player.content.DungeoneeringShop.open(DungeoneeringShop.java:12)
    at com.rs.game.player.dialogues.DungTutor.run(DungTutor.java:36)
    at com.rs.game.player.DialogueManager.continueDialogue(DialogueManager.java:31)
    at com.rs.net.decoders.WorldPacketsDecoder.processPackets(WorldPacketsDecoder.java:1130)
    at com.rs.net.decoders.WorldPacketsDecoder.decode(WorldPacketsDecoder.java:268)
    at com.rs.net.ServerChannelHandler.messageReceived(ServerChannelHandler.java:98)
    at org.jboss.netty.channel.SimpleChannelHandler.handleUpstream(SimpleChannelHandler.java:95)
    at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:563)
    at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:558)
    at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)
    at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)
    at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:91)
    at org.jboss.netty.channel.socket.nio.AbstractNioWorker.processSelectedKeys(AbstractNioWorker.java:373)
    at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:247)
    at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:35)
    at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:102)
    at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

Here is my class: 

package com.rs.game.player.content;

import com.rs.game.player.Player;

public class DungeoneeringShop {

    private static final int INTERFACE_ID = 72;
    public static Player player;

    public static void open() {
        for(int i = 69; i < 73; i++) 
            player.getPackets().sendHideIComponent(INTERFACE_ID, i, false);
        player.getInterfaceManager().sendInterface(INTERFACE_ID);
    }
}

Upvotes: 1

Views: 144

Answers (4)

Suresh Atta
Suresh Atta

Reputation: 122026

You haven't initilized player. So it is null.

It's like 

null.getPackets()  --------------> NullPointerException

So resolution is initialize it before using like 

public static Player player = new Player(); // at declaration level

or 

player = new Player(); // or later some where before using.

Upvotes: 4

hqt
hqt

Reputation: 30284

Because you haven't initialized player object yet. It should be :

package com.rs.game.player.content;

import com.rs.game.player.Player;

public class DungeoneeringShop {

private static final int INTERFACE_ID = 72;
public static Player player;

public static void open() {
    player = new Player(); // or some other constructor of this class
    for(int i = 69; i < 73; i++) 
        player.getPackets().sendHideIComponent(INTERFACE_ID, i, false);
        player.getInterfaceManager().sendInterface(INTERFACE_ID);
    }
}

I think you're a new comer to Java World. And you are learning from game development ebook. You should learn base Java more, before came to this.

Hope this help :)

Upvotes: 1

Obl Tobl
Obl Tobl

Reputation: 5684

You have to instantiate your variable player. In your example player is null.
For example if you have a parameterless constructor: 

public static Player player = new Player();

Upvotes: 3

BobTheBuilder
BobTheBuilder

Reputation: 19304

You need to instantiate 

public static Player player;

before accessing it.

Upvotes: 1

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