[1.7.10] My Custom GUI is crashing the server

Elrol_Arrowsend · February 1, 2016

I have an elevator mod that works fine on clients but crashes servers. Here is the crash report

---- Minecraft Crash Report ----

// But it works on my machine.

Time: 2/1/16 2:16 PM

Description: Exception in server tick loop

cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: net/minecraft/client/gui/GuiScreen

at cpw.mods.fml.common.LoadController.transition(LoadController.java:163)

at cpw.mods.fml.common.Loader.initializeMods(Loader.java:739)

at cpw.mods.fml.server.FMLServerHandler.finishServerLoading(FMLServerHandler.java:97)

at cpw.mods.fml.common.FMLCommonHandler.onServerStarted(FMLCommonHandler.java:319)

at net.minecraft.server.dedicated.DedicatedServer.startServer(DedicatedServer.java:213)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:445)

at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:752)

Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/gui/GuiScreen

at elrol.guiElevator.main.ElevatorMain.init(ElevatorMain.java:37)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:532)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)

at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)

at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)

at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)

at com.google.common.eventbus.EventBus.post(EventBus.java:275)

at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:212)

at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:190)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)

at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)

at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)

at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)

at com.google.common.eventbus.EventBus.post(EventBus.java:275)

at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:119)

at cpw.mods.fml.common.Loader.initializeMods(Loader.java:737)

... 5 more

Caused by: java.lang.ClassNotFoundException: net.minecraft.client.gui.GuiScreen

at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)

at java.lang.ClassLoader.loadClass(Unknown Source)

... 33 more

Caused by: java.lang.RuntimeException: Attempted to load class net/minecraft/client/gui/GuiScreen for invalid side SERVER

at cpw.mods.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:50)

at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279)

at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176)

... 35 more

A detailed walkthrough of the error, its code path and all known details is as follows:

---------------------------------------------------------------------------------------

-- System Details --

Details:

Minecraft Version: 1.7.10

Operating System: Windows 7 (amd64) version 6.1

Java Version: 1.8.0_60, Oracle Corporation

Java VM Version: Java HotSpot 64-Bit Server VM (mixed mode), Oracle Corporation

Memory: 982809800 bytes (937 MB) / 1038876672 bytes (990 MB) up to 1038876672 bytes (990 MB)

JVM Flags: 3 total; -Xincgc -Xmx1024M -Xms1024M

AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used

IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0

FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1448 4 mods loaded, 4 mods active

States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

UCHI mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)

UCHI FML{7.10.99.99} [Forge Mod Loader] (forgeSrc-1.7.10-10.13.4.1448-1.7.10.jar)

UCHI Forge{10.13.4.1448} [Minecraft Forge] (forgeSrc-1.7.10-10.13.4.1448-1.7.10.jar)

UCHE guielevator{1.1} [Elrol's GUI Elevator] (bin)

Profiler Position: N/A (disabled)

Is Modded: Definitely; Server brand changed to 'fml,forge'

Type: Dedicated Server (map_server.txt)

Here is my Elevator Block:

package elrol.guiElevator.main;

import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;
import net.minecraft.block.BlockContainer;
import net.minecraft.block.material.Material;
import net.minecraft.client.Minecraft;
import net.minecraft.client.renderer.texture.IIconRegister;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.IIcon;
import net.minecraft.world.World;

public class Elevator extends BlockContainer implements ElevatorPacketHandler{


public IIcon side;
protected IIcon field_150164_N;
    
public Elevator(String name, CreativeTabs tab, float hardness, float resistance, SoundType stepSound) {
	super(Material.iron);
	this.setBlockName(name);
	this.setHardness(hardness);
	this.setResistance(resistance);
	this.setBlockTextureName(ModInfo.MODID + ":" + name);
	this.setCreativeTab(tab);
	this.setStepSound(stepSound);

}

public boolean onBlockActivated(World world, int x, int y, int z, EntityPlayer player, int par1, float par2, float par3, float par4)
    {
	if(world.isRemote){
		if(player.isSneaking()){
			Minecraft.getMinecraft().displayGuiScreen(new ElevatorNamingGUI(world, x, y, z, player));
			return false;
		}else{
			if(player.getCurrentEquippedItem() == null){
				Minecraft.getMinecraft().displayGuiScreen(new FloorSelectGUI(world, x, y, z, player));
				return true;
			}else{
				return false;
			}

		}

	}
	else{
		return false;	
	}
    }

@Override
public TileEntity createNewTileEntity(World p_149915_1_, int p_149915_2_) {
	try{
		return new TileEntityElevator();	
	}catch (Exception var3){
		throw new RuntimeException(var3);
	}

}

public boolean hasTileEntity(int meta){
	return true;
}

@SideOnly(Side.CLIENT)
public void registerBlockIcons(IIconRegister icon){
	this.blockIcon = icon.registerIcon(this.textureName);
	this.side = icon.registerIcon(this.textureName + "_face");
}

@SideOnly(Side.CLIENT)
public IIcon getIcon(int side, int meta){
	if(side == meta){
		return this.side;
	}else{
		return this.blockIcon;
	}
}

public int onBlockPlaced(World world, int x, int y, int z, int side, float hitX, float hitY, float hitZ, int meta)
    {
	world.setBlockMetadataWithNotify(x, y, z, side, 2);
	return side;
    }

public void HandlePacket(EntityPlayer player, int x, int y, int z, String value, byte extra){
	TileEntity te = player.worldObj.getTileEntity(x, y, z);
	if(te != null && te instanceof TileEntityElevator){
		((TileEntityElevator)te).name = value;
		((TileEntityElevator)te).markDirty();;
	}
}

}

And my Naming GUI:

package elrol.guiElevator.main;

import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;

import org.lwjgl.input.Keyboard;
import org.lwjgl.opengl.GL11;

import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;
import net.minecraft.client.gui.GuiButton;
import net.minecraft.client.gui.GuiScreen;
import net.minecraft.client.gui.GuiTextField;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.util.ResourceLocation;
import net.minecraft.world.World;

public class ElevatorNamingGUI extends GuiScreen{
public static ResourceLocation gui = new ResourceLocation(ModInfo.MODID, "textures/gui/floor_name.png");
public static int guiWidth = 248;
public static int guiHeight = 166;

GuiTextField nameInput;

GuiButton okButton;
GuiButton cancelButton;

public EntityPlayer player;

public int X;
public int Y;
public int Z;

public World world;

public ElevatorNamingGUI (World world, int x, int y, int z, EntityPlayer player){
	this.X = x;
	this.Y = y;
	this.Z = z;

	this.player = player;
	this.world = world;
}

@Override
public void drawScreen(int x, int y,float tick){
	int guiX = (width-guiWidth)/2;
	int guiY = (height-guiHeight)/2;

	GL11.glColor4f(1, 1, 1, 1);
	mc.renderEngine.bindTexture(gui);
	drawTexturedModalRect(guiX, guiY, 0, 0, guiWidth, guiHeight);
	this.nameInput.drawTextBox();
	drawStrings(guiX, guiY);

	super.drawScreen(x, y, tick);

}

public void initGui(){
	int guiX = (width-guiWidth)/2;
	int guiY = (height-guiHeight)/2;

	buttonList.clear();
	this.nameInput = new GuiTextField(this.fontRendererObj, guiX+74, guiY+32, 100, 20);
        nameInput.setMaxStringLength(32);
	this.nameInput.setFocused(true);
	if(((TileEntityElevator)world.getTileEntity(X, Y, Z)).isNamed()){
		this.nameInput.setText(((TileEntityElevator)world.getTileEntity(X, Y, Z)).getName());
		System.out.println(((TileEntityElevator)world.getTileEntity(X, Y, Z)).getName());
	}else{
		this.nameInput.setText("");
	}
        
        buttonList.add(okButton = new GuiButton(Y, guiX+79, guiY+64, 40, 20, "Rename"));
        buttonList.add(cancelButton = new GuiButton(1, guiX+129, guiY+64, 40, 20, "Cancel"));
	super.initGui();
}

public void drawStrings(int guiX, int guiY){
	fontRendererObj.drawString("Name the floor", guiX+8,guiY+8, 0x000000);
}

protected void actionPerformed(GuiButton button){

	if(button.id == Y){
		NBTTagCompound tag = new NBTTagCompound();
		tag.setString("name", this.nameInput.getText().trim());
		tag.setBoolean("named", true);
		System.out.println(Y);
		((TileEntityElevator)world.getTileEntity(X, button.id, Z)).readFromNBT(tag);
		nameBlock(this.nameInput.getText().trim());
		PacketStringName.send(X, button.id, Z, this.nameInput.getText().trim(), (byte)0);
		mc.displayGuiScreen(null);
		return ;
	}else{
		mc.displayGuiScreen(null);	
	}
}

protected void keyTyped(char c, int key){
	this.nameInput.textboxKeyTyped(c, key);
        
	if(!this.nameInput.isFocused()){
		switch(key){
		case Keyboard.KEY_E:
			mc.displayGuiScreen(null);

		case Keyboard.KEY_ESCAPE:
			mc.displayGuiScreen(null);
		}
	}else{
		switch(key){
		case Keyboard.KEY_ESCAPE:
			this.nameInput.setFocused(false);
		}

	}

}

public void updateScreen()
    {
        super.updateScreen();
        this.nameInput.updateCursorCounter();
    }

protected void mouseClicked(int x, int y, int btn) {
        super.mouseClicked(x, y, btn);
        this.nameInput.mouseClicked(x, y, btn);
    }

public void nameBlock(String name){
	ByteArrayOutputStream bos = new ByteArrayOutputStream(;
	DataOutputStream dos = new DataOutputStream(bos);
	try{
		dos.writeUTF(name);
	}catch(Exception v){
		v.printStackTrace();
	}

}
}

and my Floor Select GUI:

package elrol.guiElevator.main;

import java.awt.List;

import net.minecraft.client.gui.GuiButton;
import net.minecraft.client.gui.GuiScreen;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.init.Blocks;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.util.ResourceLocation;
import net.minecraft.world.World;

import org.lwjgl.input.Keyboard;
import org.lwjgl.opengl.GL11;

import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;

public class FloorSelectGUI extends GuiScreen{

public static ResourceLocation gui = new ResourceLocation(ModInfo.MODID, "textures/gui/floor_select.png");
public static int guiWidth = 248;
public static int guiHeight = 166;

GuiButton floorButton;

public EntityPlayer player;

public int X;
public int Y;
public int Z;

public World world;

public FloorSelectGUI (World world, int x, int y, int z, EntityPlayer player){
	this.X = x;
	this.Y = y;
	this.Z = z;

	this.player = player;
	this.world = world;
}

@Override
public void drawScreen(int x, int y,float tick){
	int guiX = (width-guiWidth)/2;
	int guiY = (height-guiHeight)/2;

	GL11.glColor4f(1, 1, 1, 1);
	mc.renderEngine.bindTexture(gui);
	drawTexturedModalRect(guiX, guiY, 0, 0, guiWidth, guiHeight);

	drawStrings(guiX, guiY);

	super.drawScreen(x, y, tick);

}

public void initGui(){
	int guiX = (width-guiWidth)/2;
	int guiY = (height-guiHeight)/2;
	int floor = 0;
	int col = 0;
	buttonList.clear();

	for(int blockY = 0; blockY < 256; blockY++){
		if(world.getBlock(X, blockY, Z) == ElevatorMain.elevator){
			if(isFloorValid(world, X, blockY, Z, world.getBlockMetadata(X, blockY,Z))){
				if(floor < 24){
					if(((TileEntityElevator)world.getTileEntity(X, blockY, Z)).getName() != ""){
						buttonList.add(floorButton = new GuiButton(blockY, guiX + 9 + (83*col) , guiY + 20 + (16 * floor)-(16 * (8 * col)), 64, 16, ((TileEntityElevator)world.getTileEntity(X, blockY, Z)).getName()));
					}else{
						buttonList.add(floorButton = new GuiButton(blockY, guiX + 9 + (83*col) , guiY + 20 + (16 * floor)-(16 * (8 * col)), 64, 16, "Floor " + (floor+1)));	
					}
					System.out.println("<" + ((TileEntityElevator)world.getTileEntity(X, blockY, Z)).getName() + ">");
					floor++;
					if(floor > 7 && floor < 16){
						col = 1;
					}
					if(floor > 15){
						col = 2;
					}
					//System.out.println("elevator found at Y:" + blockY + "(" + floor + "[" + ((TileEntityElevator)world.getTileEntity(X, blockY, Z)).name +"]" +")");	
				}
			}
		}
	}

	super.initGui();
}

public void drawStrings(int guiX, int guiY){
	fontRendererObj.drawString("Select a floor", guiX+8,guiY+8, 0x000000);

}

protected void actionPerformed(GuiButton button){
	if(button.id > 0 && button.id < 256){
		System.out.println(button.id);
		switch(world.getBlockMetadata(X, button.id, Z)){
		case 0: player.setPositionAndUpdate((double)X + 0.5D, (double)button.id - 2D, (double)Z + 0.5D);
			break;
		case 1: player.setPositionAndUpdate((double)X + 0.5D, (double)button.id + 1D, (double)Z + 0.5D);
			break;
		case 2: player.setPositionAndUpdate((double)X + 0.5D, (double)button.id-1, (double)Z - 0.5D);
			break;
		case 3: player.setPositionAndUpdate((double)X + 0.5D, (double)button.id-1, (double)Z + 1.5D);
			break;
		case 4: player.setPositionAndUpdate((double)X - 0.5D, (double)button.id-1, (double)Z + 0.5D);
			break;
		case 5: player.setPositionAndUpdate((double)X + 1.5D, (double)button.id-1, (double)Z + 0.5D);
			break;
		default: System.out.println("ERROR WITH METADATA :" + world.getBlockMetadata(X, button.id, Y));
		}
	mc.displayGuiScreen(null);
	}
}

protected void keyTyped(char c, int key){
	switch(key){
	case Keyboard.KEY_E:
		mc.displayGuiScreen(null);

	case Keyboard.KEY_ESCAPE:
		mc.displayGuiScreen(null);
	}
}

public boolean isFloorValid(World world, int x, int y, int z, int meta){
	System.out.println(x + ", " + y + ", " + z + ", " + world.getBlockMetadata(x,y,z));
	if(world.getBlockPowerInput(x, y, z) == 0){
		switch(world.getBlockMetadata(x,y,z)){
		case 0:
			if(world.getBlock(x, y-1, z).getCollisionBoundingBoxFromPool(world, x, y, z) == null && world.getBlock(x, y-2, z).getCollisionBoundingBoxFromPool(world, x, y, z) == null ){
				System.out.println("has space");
				return true;
			}else{
				System.out.println(world.getBlock(x, y-1, z).getUnlocalizedName() + ", " + world.getBlock(x, y-2, z).getUnlocalizedName());
				return false;}
		case 1:
			if(world.getBlock(x, y+1, z).getCollisionBoundingBoxFromPool(world, x, y, z) == null  && world.getBlock(x, y+2, z).getCollisionBoundingBoxFromPool(world, x, y, z) == null ){
				System.out.println("has space");
				return true;
			}else{
				System.out.println(world.getBlock(x, y+1, z).getUnlocalizedName() + ", " + world.getBlock(x, y+2, z).getUnlocalizedName());
				return false;}
		case 2:
			if(world.getBlock(x, y, z-1).getCollisionBoundingBoxFromPool(world, x, y, z) == null  && world.getBlock(x, y-1, z-1).getCollisionBoundingBoxFromPool(world, x, y, z) == null ){
				System.out.println("has space");
				return true;
			}else{
				System.out.println(world.getBlock(x, y, z-1).getUnlocalizedName() + ", " + world.getBlock(x, y-1, z-1).getUnlocalizedName());
				return false;}
		case 3:
			if(world.getBlock(x, y, z+1).getCollisionBoundingBoxFromPool(world, x, y, z) == null  && world.getBlock(x, y-1, z+1).getCollisionBoundingBoxFromPool(world, x, y, z) == null ){
				System.out.println("has space");
				return true;
			}else{System.out.println(world.getBlock(x, y, z+1).getUnlocalizedName() + ", " + world.getBlock(x, y-1, z+1).getUnlocalizedName());
			return false;}
		case 4:
			if(world.getBlock(x-1, y, z).getCollisionBoundingBoxFromPool(world, x, y, z) == null  && world.getBlock(x-1, y-1, z).getCollisionBoundingBoxFromPool(world, x, y, z) == null ){
				System.out.println("has space");
				return true;
			}else{System.out.println(world.getBlock(x-1, y, z).getUnlocalizedName() + ", " + world.getBlock(x-1, y-1, z).getUnlocalizedName());
			return false;}
		case 5:
			if(world.getBlock(x+1, y, z).getCollisionBoundingBoxFromPool(world, x, y, z) == null  && world.getBlock(x+1, y-1, z).getCollisionBoundingBoxFromPool(world, x, y, z) == null ){
				System.out.println("has space");
				return true;
			}else{System.out.println(world.getBlock(x+1, y, z).getUnlocalizedName() + ", " + world.getBlock(x+1, y-1, z).getUnlocalizedName());
			return false;}
		default: 
			System.out.println("ERROR: METADATA > 5");
			return false;
		}
	}else{
		return false;
	}


}
}

Draco18s · February 1, 2016

And

player.openGui(...)

Elrol_Arrowsend · February 1, 2016

alright, so how would I fix this, register them in the proxy? and isn't .opengui client only, I thought I had a check to see if the world was remote. can you explain where I should register the block then?

Elrol_Arrowsend · February 4, 2016

how exactly would I route them through. can you give me an example so that I can understand it better and learn a thing or two. I do appreciate the help!

ratismal · February 4, 2016

You're probably going to want to use a GuiHandler. Here's a base to start off with.

public class GuiHandler implements IGuiHandler{
    @Override
    public Object getServerGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) {
        /**
          * Check IDs here, return container
          **/
        return null;
    }

    @Override
    public Object getClientGuiElement(int ID, EntityPlayer player, World world, int x, int y, int {
        /**
          * Check IDs here, return GUI
          **/
        return null;
    }

}

When you use player.openGui(...), the one of the parameters is an integer ID. In the GuiHandler, you're going to want to check the ID passed in through parameters against a reference GUI ID. This is how the game knows which GUI to open.

As a reference, you can check out the source of my mod here. It's for 1.8, but it should still be applicable for 1.7.10 if memory serves correctly.

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[1.7.10] My Custom GUI is crashing the server

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