GuiTextField crash

[Stenbergcsgo]

I created a custom GUI:

package com.mta.utzonmod.client.gui;
 
import java.io.IOException;
 
import org.lwjgl.input.Keyboard;
 
import net.minecraft.client.gui.GuiButton;
import net.minecraft.client.gui.GuiScreen;
import net.minecraft.client.gui.GuiTextField;
import net.minecraft.client.renderer.GlStateManager;
import net.minecraft.client.resources.I18n;
import net.minecraft.util.ChatAllowedCharacters;
import net.minecraft.util.text.ITextComponent;
import net.minecraft.util.text.TextComponentString;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;
 
@SideOnly(Side.CLIENT)
public class signInputGui extends GuiScreen {
   
    private GuiButton doneBtn;
    private int updateCounter;
    public GuiTextField textfield = new GuiTextField(1, this.fontRenderer, this.width / 2 - 68, this.height / 2 - 46, 137, 20);
    public String playerInput;
   
   
    public void initGui() {
        this.buttonList.clear();
        Keyboard.enableRepeatEvents(true);
        this.doneBtn = this.addButton(new GuiButton(0, this.width / 2 - 100, this.height / 4 + 120, I18n.format("gui.done"))); 
        textfield.setMaxStringLength(30);
        textfield.setText("");
        this.textfield.setFocused(true);
    }
   
    public void keyTyped(char c, int i) throws IOException {
        super.keyTyped(c, i);
        this.textfield.textboxKeyTyped(c, i);
       
    }
   
    public void onGuiClosed() {
        textfield.setFocused(false);
        Keyboard.enableRepeatEvents(false);
    }
   
    public void updateScreen() {
        ++this.updateCounter;
        this.textfield.updateCursorCounter();
        playerInput = textfield.getText();
    }
   
    protected void actionPerformed(GuiButton button) throws IOException {
        if(button.enabled) {
            if(button.id == 0) {
                this.mc.displayGuiScreen((GuiScreen)null);
            }
        }
    }
   
    public void drawScreen(int mouseX, int mouseY, float partialTicks) {
        this.drawDefaultBackground();
        this.drawCenteredString(this.fontRenderer, "Insert schematic name",this.width / 2, 40, 16777215);
        this.textfield.drawTextBox();
        super.drawScreen(mouseX, mouseY, partialTicks);
    }
   
    protected void mouseClicked(int x, int y, int btn) throws IOException {
        super.mouseClicked(x, y, btn);
        this.textfield.mouseClicked(x, y, btn);
    }
   
    public String getPlayerInput() {
        return playerInput;
    }
}

 

And it works (somewhat) - If I open the game, and wait for a bit, then use my custom item with GUI it works as expected, but if I use the item as soon as I get into the server, I get a crash. Because of the nature of the error I expect it has something to do with the initialization, but in what manner I am unclear.

 

Full error:

---- Minecraft Crash Report ----
// Oh - I know what I did wrong!

Time: 4/9/18 11:57 AM
Description: Rendering screen

java.lang.NullPointerException: Rendering screen
	at net.minecraft.client.gui.GuiTextField.drawTextBox(GuiTextField.java:545)
	at com.mta.utzonmod.client.gui.signInputGui.drawScreen(signInputGui.java:65)
	at net.minecraftforge.client.ForgeHooksClient.drawScreen(ForgeHooksClient.java:368)
	at net.minecraft.client.renderer.EntityRenderer.updateCameraAndRender(EntityRenderer.java:1177)
	at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1207)
	at net.minecraft.client.Minecraft.run(Minecraft.java:441)
	at net.minecraft.client.main.Main.main(Main.java:118)
	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 net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
	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 net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97)
	at GradleStart.main(GradleStart.java:26)


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

-- Head --
Thread: Client thread
Stacktrace:
	at net.minecraft.client.gui.GuiTextField.drawTextBox(GuiTextField.java:545)
	at com.mta.utzonmod.client.gui.signInputGui.drawScreen(signInputGui.java:65)
	at net.minecraftforge.client.ForgeHooksClient.drawScreen(ForgeHooksClient.java:368)

-- Screen render details --
Details:
	Screen name: com.mta.utzonmod.client.gui.signInputGui
	Mouse location: Scaled: (105, 197). Absolute: (427, 240)
	Screen size: Scaled: (427, 240). Absolute: (854, 480). Scale factor of 2

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [EntityPlayerSP['Player503'/163, l='MpServer', x=2020.62, y=3.00, z=1209.47]]
	Chunk stats: MultiplayerChunkCache: 622, 622
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (1994,4,1180), Chunk: (at 10,0,12 in 124,73; contains blocks 1984,0,1168 to 1999,255,1183), Region: (3,2; contains chunks 96,64 to 127,95, blocks 1536,0,1024 to 2047,255,1535)
	Level time: 13786 game time, 13786 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
	Forced entities: 79 total; [EntitySlime['Slime'/128, l='MpServer', x=2056.45, y=4.89, z=1280.15], EntityChicken['Chicken'/130, l='MpServer', x=2066.11, y=4.00, z=1252.91], EntityVillager['Villager'/132, l='MpServer', x=2094.50, y=5.00, z=1206.49], EntityVillager['Villager'/133, l='MpServer', x=2081.49, y=5.00, z=1200.07], EntityPlayerSP['Player503'/163, l='MpServer', x=2020.62, y=3.00, z=1209.47], EntitySlime['Slime'/40, l='MpServer', x=1945.09, y=4.00, z=1152.57], EntitySkeleton['Skeleton'/42, l='MpServer', x=1945.50, y=4.00, z=1201.50], EntitySkeleton['Skeleton'/43, l='MpServer', x=1940.81, y=4.00, z=1203.76], EntityCreeper['Creeper'/44, l='MpServer', x=1944.48, y=4.00, z=1208.58], EntityCreeper['Creeper'/45, l='MpServer', x=1951.50, y=4.00, z=1209.89], EntityPig['Pig'/47, l='MpServer', x=1945.79, y=4.00, z=1223.39], EntitySlime['Slime'/48, l='MpServer', x=1949.68, y=4.00, z=1219.31], EntitySlime['Slime'/49, l='MpServer', x=1959.03, y=4.00, z=1238.07], EntitySlime['Slime'/50, l='MpServer', x=1941.76, y=4.11, z=1235.26], EntitySlime['Slime'/51, l='MpServer', x=1946.12, y=4.00, z=1241.39], EntitySlime['Slime'/53, l='MpServer', x=1951.55, y=4.00, z=1267.16], EntitySlime['Slime'/54, l='MpServer', x=1959.71, y=4.00, z=1279.04], EntitySlime['Slime'/56, l='MpServer', x=1961.88, y=4.28, z=1203.91], EntitySlime['Slime'/57, l='MpServer', x=1955.53, y=4.00, z=1213.90], EntityPig['Pig'/58, l='MpServer', x=1966.21, y=4.00, z=1214.67], EntitySheep['Sheep'/59, l='MpServer', x=1958.36, y=4.00, z=1225.19], EntitySlime['Slime'/60, l='MpServer', x=1957.15, y=5.04, z=1224.21], EntitySlime['Slime'/61, l='MpServer', x=1963.73, y=5.04, z=1211.60], EntitySlime['Slime'/62, l='MpServer', x=1962.09, y=4.11, z=1229.70], EntitySlime['Slime'/63, l='MpServer', x=1952.97, y=4.00, z=1235.64], EntitySlime['Slime'/64, l='MpServer', x=1960.68, y=4.14, z=1239.06], EntitySlime['Slime'/69, l='MpServer', x=1968.83, y=4.34, z=1154.73], EntitySheep['Sheep'/70, l='MpServer', x=1980.82, y=4.00, z=1168.44], EntitySlime['Slime'/71, l='MpServer', x=1988.63, y=4.34, z=1202.20], EntitySlime['Slime'/72, l='MpServer', x=1985.39, y=4.48, z=1204.31], EntitySlime['Slime'/73, l='MpServer', x=1980.55, y=4.00, z=1198.62], EntitySlime['Slime'/74, l='MpServer', x=1973.44, y=4.00, z=1224.57], EntitySlime['Slime'/75, l='MpServer', x=1983.09, y=4.00, z=1221.68], EntitySlime['Slime'/76, l='MpServer', x=1984.92, y=5.00, z=1240.47], EntitySlime['Slime'/77, l='MpServer', x=1980.69, y=4.03, z=1232.13], EntitySlime['Slime'/78, l='MpServer', x=1983.00, y=4.14, z=1239.41], EntitySlime['Slime'/79, l='MpServer', x=1973.35, y=4.00, z=1240.43], EntitySlime['Slime'/80, l='MpServer', x=1985.13, y=4.00, z=1246.03], EntitySlime['Slime'/81, l='MpServer', x=1970.89, y=5.00, z=1262.21], EntitySlime['Slime'/82, l='MpServer', x=1975.30, y=4.77, z=1257.05], EntitySlime['Slime'/84, l='MpServer', x=1977.84, y=4.00, z=1277.74], EntitySlime['Slime'/86, l='MpServer', x=1974.92, y=5.00, z=1280.19], EntitySlime['Slime'/91, l='MpServer', x=1996.85, y=4.77, z=1137.84], EntitySlime['Slime'/92, l='MpServer', x=1997.24, y=4.14, z=1142.90], EntitySlime['Slime'/93, l='MpServer', x=1986.24, y=4.00, z=1203.97], EntitySlime['Slime'/94, l='MpServer', x=2002.33, y=4.63, z=1199.57], EntitySlime['Slime'/95, l='MpServer', x=1986.77, y=4.78, z=1222.70], EntitySlime['Slime'/96, l='MpServer', x=1983.13, y=4.14, z=1254.33], EntitySlime['Slime'/97, l='MpServer', x=1988.22, y=4.00, z=1272.83], EntitySlime['Slime'/98, l='MpServer', x=1983.19, y=4.77, z=1289.70], EntitySlime['Slime'/99, l='MpServer', x=2010.67, y=4.18, z=1143.98], EntitySlime['Slime'/100, l='MpServer', x=2016.56, y=4.63, z=1225.59], EntitySlime['Slime'/101, l='MpServer', x=2007.20, y=4.00, z=1217.88], EntitySlime['Slime'/102, l='MpServer', x=2016.44, y=5.06, z=1239.04], EntityHorse['Horse'/103, l='MpServer', x=2013.70, y=4.00, z=1257.58], EntityCow['Cow'/104, l='MpServer', x=1998.74, y=4.00, z=1276.43], EntitySheep['Sheep'/105, l='MpServer', x=2019.45, y=4.00, z=1133.78], EntitySheep['Sheep'/106, l='MpServer', x=2029.23, y=4.00, z=1185.67], EntitySlime['Slime'/107, l='MpServer', x=2019.56, y=4.00, z=1215.09], EntitySlime['Slime'/108, l='MpServer', x=2023.58, y=4.03, z=1214.03], EntitySlime['Slime'/109, l='MpServer', x=2027.03, y=4.34, z=1235.00], EntitySlime['Slime'/110, l='MpServer', x=2014.67, y=4.00, z=1241.15], EntitySlime['Slime'/111, l='MpServer', x=2036.40, y=5.04, z=1259.85], EntityHorse['Horse'/112, l='MpServer', x=2022.44, y=4.00, z=1255.49], EntityHorse['Horse'/113, l='MpServer', x=2021.36, y=4.00, z=1255.50], EntitySlime['Slime'/114, l='MpServer', x=2028.02, y=4.78, z=1259.45], EntityPig['Pig'/115, l='MpServer', x=2037.19, y=4.00, z=1187.33], EntitySlime['Slime'/116, l='MpServer', x=2036.34, y=5.00, z=1219.13], EntityChicken['Chicken'/117, l='MpServer', x=2035.82, y=4.00, z=1231.89], EntityZombie['Zombie'/118, l='MpServer', x=2046.29, y=4.00, z=1219.43], EntityItem['item.item.egg'/119, l='MpServer', x=2043.57, y=4.00, z=1247.18], EntityCow['Cow'/120, l='MpServer', x=2058.47, y=4.00, z=1182.38], EntityPig['Pig'/121, l='MpServer', x=2061.77, y=4.00, z=1188.39], EntitySlime['Slime'/122, l='MpServer', x=2059.71, y=4.28, z=1195.77], EntitySlime['Slime'/123, l='MpServer', x=2061.93, y=4.78, z=1218.27], EntityChicken['Chicken'/124, l='MpServer', x=2048.45, y=4.00, z=1238.32], EntityChicken['Chicken'/125, l='MpServer', x=2061.10, y=4.00, z=1254.83], EntityItem['item.item.egg'/126, l='MpServer', x=2059.97, y=4.00, z=1261.94], EntitySlime['Slime'/127, l='MpServer', x=2048.50, y=4.03, z=1286.58]]
	Retry entities: 0 total; []
	Server brand: fml,forge
	Server type: Integrated singleplayer server
Stacktrace:
	at net.minecraft.client.multiplayer.WorldClient.addWorldInfoToCrashReport(WorldClient.java:461)
	at net.minecraft.client.Minecraft.addGraphicsAndWorldToCrashReport(Minecraft.java:2896)
	at net.minecraft.client.Minecraft.run(Minecraft.java:462)
	at net.minecraft.client.main.Main.main(Main.java:118)
	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 net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
	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 net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97)
	at GradleStart.main(GradleStart.java:26)

-- System Details --
Details:
	Minecraft Version: 1.12.2
	Operating System: Windows 8.1 (amd64) version 6.3
	Java Version: 1.8.0_131, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 131987664 bytes (125 MB) / 844103680 bytes (805 MB) up to 1884815360 bytes (1797 MB)
	JVM Flags: 0 total; 
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	FML: MCP 9.42 Powered by Forge 14.23.2.2624 5 mods loaded, 5 mods active
	States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

	| State     | ID        | Version      | Source                           | Signature |
	|:--------- |:--------- |:------------ |:-------------------------------- |:--------- |
	| UCHIJAAAA | minecraft | 1.12.2       | minecraft.jar                    | None      |
	| UCHIJAAAA | mcp       | 9.42         | minecraft.jar                    | None      |
	| UCHIJAAAA | FML       | 8.0.99.99    | forgeSrc-1.12.2-14.23.2.2624.jar | None      |
	| UCHIJAAAA | forge     | 14.23.2.2624 | forgeSrc-1.12.2-14.23.2.2624.jar | None      |
	| UCHIJAAAA | um        | 1.0          | bin                              | None      |

	Loaded coremods (and transformers): 
	GL info: ' Vendor: 'Intel' Version: '4.2.0 - Build 10.18.10.3910' Renderer: 'Intel(R) HD Graphics 4400'
	Launched Version: 1.12.2
	LWJGL: 2.9.4
	OpenGL: Intel(R) HD Graphics 4400 GL version 4.2.0 - Build 10.18.10.3910, Intel
	GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

	Using VBOs: Yes
	Is Modded: Definitely; Client brand changed to 'fml,forge'
	Type: Client (map_client.txt)
	Resource Packs: 
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	CPU: 4x Intel(R) Core(TM) i5-4210U CPU @ 1.70GHz

 

 

[Lenardjee]

Have you tried initialising the texfield inside the init method? I've had quite some issues with initialization of variables myself too...

[Stenbergcsgo]

3 minutes ago, Lenardjee said:

Have you tried initialising the texfield inside the init method? I've had quite some issues with initialization of variables myself too...

Yea tried both  same result

[Lenardjee]

Yeah, now that I looked up the cause of the error in GuiTextField

String s = this.fontRenderer.trimStringToWidth(this.text.substring(this.lineScrollOffset), this.getWidth());

It seems that the problem is that lineScrollOffset or this.getWidth() or this.text is null. You can debug that by putting

System.out.println("textbox.text : " + textbox.getText());
System.out.println("lineScrollOffset : " + textbox.getWidth());

before line 65 in your class, if both of these don't return null, then lineScrollOffset must be null, or there is something in hte trimStringToWidth method that makes it return null

[Stenbergcsgo]

Alright I tried debugging and these are the results:

[09:39:18] [Server thread/INFO] [STDOUT]: [com.mta.utzonmod.client.gui.signInputGui:initGui:34]: textbox.text : 
[09:39:18] [Server thread/INFO] [STDOUT]: [com.mta.utzonmod.client.gui.signInputGui:initGui:35]: lineScrollOffset : 129

textbox.text is empty because I put it to: ""

 

So it's not null.

 

Doesn't seem like the textbox is the issue