Hi everyone, I started new mod, but got a problem:

Crash-report:

Spoiler

Unreported exception thrown!
java.lang.NullPointerException
	at ivansteklow.fmhammers.tools.ItemHammer.onBlockStartBreak(ItemHammer.java:35) ~[ItemHammer.class:?]
	at net.minecraft.client.multiplayer.PlayerControllerMP.onPlayerDestroyBlock(PlayerControllerMP.java:146) ~[PlayerControllerMP.class:?]
	at net.minecraft.client.multiplayer.PlayerControllerMP.onPlayerDamageBlock(PlayerControllerMP.java:339) ~[PlayerControllerMP.class:?]
	at net.minecraft.client.Minecraft.sendClickBlockToController(Minecraft.java:1504) ~[Minecraft.class:?]
	at net.minecraft.client.Minecraft.processKeyBinds(Minecraft.java:2290) ~[Minecraft.class:?]
	at net.minecraft.client.Minecraft.runTickKeyboard(Minecraft.java:2053) ~[Minecraft.class:?]
	at net.minecraft.client.Minecraft.runTick(Minecraft.java:1841) ~[Minecraft.class:?]
	at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1119) ~[Minecraft.class:?]
	at net.minecraft.client.Minecraft.run(Minecraft.java:407) [Minecraft.class:?]
	at net.minecraft.client.main.Main.main(Main.java:118) [Main.class:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_131]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_131]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_131]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_131]
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?]
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_131]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_131]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_131]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_131]
	at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97) [start/:?]
	at GradleStart.main(GradleStart.java:26) [start/:?]

 

So, you can view this file at my GitHub: https://github.com/IvanSteklow/FMHammers/blob/master/src/main/java/ivansteklow/fmhammers/tools/ItemHammer.java

 

HELP ME PLS!!! & excuse me for my broken english

Edited July 9, 20178 yr by IvanSteklow
Solved

A Null Pointer Exception means you're treating a variable like an object, but it actually holds null (or "nothing") in it, so it doesn't have the methods you're trying to use. This error tells you the problem is in your ItemHammer.java file on line 35. So check there and see what variables you're trying to access, and then you can start thinking about why they might not have an actual object like you're expecting. Hint: Look at how many different constructors RayTraceResult has, and look at which one you're using. (Also, take V0idW1k3r's advice in general; but for the NPE, look at the constructors.)

Edited July 7, 20178 yr by IceMetalPunk

This is not how you raytrace anything. Items already have a built-in raytrace method conviniently called Item::rayTrace.

15 hours ago, IceMetalPunk said:

A Null Pointer Exception means you're treating a variable like an object, but it actually holds null (or "nothing") in it, so it doesn't have the methods you're trying to use. This error tells you the problem is in your ItemHammer.java file on line 35. So check there and see what variables you're trying to access, and then you can start thinking about why they might not have an actual object like you're expecting. Hint: Look at how many different constructors RayTraceResult has, and look at which one you're using. (Also, take V0idW1k3r's advice in general; but for the NPE, look at the constructors.)

 

15 hours ago, V0idWa1k3r said:

This is not how you raytrace anything. Items already have a built-in raytrace method conviniently called Item::rayTrace.

Thank you, I fixed it!