Minecraft Forums

Got an error:

Failed to load MyCraft!
java.lang.NullPointerException
at org.frustra.mycraft.modding.advanced.InjectUtil.injectRender(InjectUtil.java:1097)
at org.frustra.mycraft.modding.advanced.InjectUtil.init(InjectUtil.java:144)
at net.minecraft.GameUpdater.updateClassPath(GameUpdater.java:287)
at net.minecraft.GameUpdater.run(GameUpdater.java:250)
at net.minecraft.Launcher$1.run(Launcher.java:73)
Exception in thread "Thread-4" java.lang.ClassFormatError: Duplicate method name&signature in class file bz
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at org.frustra.mycraft.modding.advanced.CustomClassLoader.loadClass(CustomClassLoader.java:165)
at net.minecraft.client.MinecraftApplet.init(SourceFile:41)
at net.minecraft.Launcher.replace(Launcher.java:132)
at net.minecraft.Launcher$1.run(Launcher.java:76)

What i must do?

Guys join the webchat if you really want help.

We've helped many already and in every case it has been something simple that was overlooked. It really isn't as complicated as it may seem.

And so far running from a batch file has worked for everyone when double-clicking mycraft.jar fails. There are just slight differences in what you need to put into your batch file depending on your system.

It is therefore much easier to help you live in IRC chat and we can catch things you might be overlooking or doing wrong easier that way.

So quit being stubborn and get proper help NOW! Click the following link to chat with a live friendly English speaking representative.

Quote from thumper10 »

I got an error when I clicked "Play Offline". I used a fresh minecraft.jar, no mods added.

      Minecraft has crashed!      
      ----------------------      

Minecraft has stopped running because it encountered a problem.

If you wish to report this, please copy this entire text and email it to [email protected].
Please include a description of what you did when the error occured.

Mods loaded:
ModLoader Beta 1.2_02v2

--- BEGIN ERROR REPORT 7a76c31 --------
Generated 1/24/11 2:39 PM

Minecraft: Minecraft Beta 1.2_02
OS: Windows XP (x86) version 5.1
Java: 1.6.0_22, Sun Microsystems Inc.
VM: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
LWJGL: 2.4.2
OpenGL: ATI Radeon X1050 version 2.1.8494 Release, ATI Technologies Inc.

java.lang.NullPointerException
	at ModLoader.init(ModLoader.java:387)
	at ModLoader.AddAllRenderers(ModLoader.java:81)
	at oc.<init>(RenderManager.java:41)
	at oc.<clinit>(RenderManager.java:121)
	at net.minecraft.client.Minecraft.a(Minecraft.java:194)
	at net.minecraft.client.Minecraft.run(Minecraft.java:472)
	at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 4a7f9446 ----------

nullpointerexception is a random crash that is built into java to frustrate the user at a crucial moment
LOL JK- it is a random crash that has no apparent cause or way of preventing.

Quote from Elite »

make sure you are in the right folder.
It will tell you what folder you are in.
To change it, type "cd <folder name>"
So it will likely start in your home folder, so type "cd Desktop/MyCraft" if MyCraft is on your desktop.
Then run java -jar MyCraft.jar

Ok so i did this and it said:
Running with extra ram
MyCraft V1.0-2
Lib file: minecraft.jar

java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:114)
at java.util.jar.JarFile.<init>(JarFile.java:135)
at java.util.jar.JarFile.<init>(JarFile.java:72)
at sun.net.www.protocol.jar.URLJarFile.&lt;init&gt;(URLJarFile.java:72)
at sun.net.www.protocol.jar.URLJarFile.getJarFile(URLJarFile.java:48)
at sun.net.www.protocol.jar.JarFileFactory.get(JarFileFactory.java:55)
at sun.net.www.protocol.jar.JarURLConnection.connect(JarURLConnection.java:104)
at sun.net.www.protocol.jar.JarURLConnection.getJarFile(JarURLConnection.java:71)
at org.frustra.mycraft.MyCraft.loadJar(MyCraft.java:495)
at org.frustra.mycraft.MyCraft.main(MyCraft.java:121)
Exception in thread "main" java.lang.NullPointerException
at org.frustra.mycraft.MyCraft.injectMyCraft(MyCraft.java:237)
at org.frustra.mycraft.MyCraft.main(MyCraft.java:164)

java.lang.Exception: Exit value: 1
at org.frustra.mycraft.RamLauncher.main(RamLauncher.java:77)
Running with normal ram (error)
MyCraft V1.0-2
Lib file: minecraft.jar

java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:114)
at java.util.jar.JarFile.<init>(JarFile.java:135)
at java.util.jar.JarFile.<init>(JarFile.java:72)
at sun.net.www.protocol.jar.URLJarFile.&lt;init&gt;(URLJarFile.java:72)
at sun.net.www.protocol.jar.URLJarFile.getJarFile(URLJarFile.java:48)
at sun.net.www.protocol.jar.JarFileFactory.get(JarFileFactory.java:55)
at sun.net.www.protocol.jar.JarURLConnection.connect(JarURLConnection.java:104)
at sun.net.www.protocol.jar.JarURLConnection.getJarFile(JarURLConnection.java:71)
at org.frustra.mycraft.MyCraft.loadJar(MyCraft.java:495)
at org.frustra.mycraft.MyCraft.main(MyCraft.java:121)
at org.frustra.mycraft.RamLauncher.main(RamLauncher.java:82)
Exception in thread "main" java.lang.NullPointerException
at org.frustra.mycraft.MyCraft.injectMyCraft(MyCraft.java:237)
at org.frustra.mycraft.MyCraft.main(MyCraft.java:164)
at org.frustra.mycraft.RamLauncher.main(RamLauncher.java:82)[/quote]

It looks like your jar is corrupt, try downloading it again from the link.

Quote from setazer »

Got an error:

Failed to load MyCraft!
java.lang.NullPointerException
at org.frustra.mycraft.modding.advanced.InjectUtil.injectRender(InjectUtil.java:1097)
at org.frustra.mycraft.modding.advanced.InjectUtil.init(InjectUtil.java:144)
at net.minecraft.GameUpdater.updateClassPath(GameUpdater.java:287)
at net.minecraft.GameUpdater.run(GameUpdater.java:250)
at net.minecraft.Launcher$1.run(Launcher.java:73)
Exception in thread "Thread-4" java.lang.ClassFormatError: Duplicate method name&signature in class file bz
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at org.frustra.mycraft.modding.advanced.CustomClassLoader.loadClass(CustomClassLoader.java:165)
at net.minecraft.client.MinecraftApplet.init(SourceFile:41)
at net.minecraft.Launcher.replace(Launcher.java:132)
at net.minecraft.Launcher$1.run(Launcher.java:76)

What i must do?

You've put the wrong minecraft.jar file in the lib folder.
Make sure it's the minecraft launcher, not the game itself.

Quote from VaryGeek »

Is the smooth lighting Mr. M's?

Smooth lighting uses the same method as Mr M's, however it is not the same mod.

how do u get your mods on the manager?

Quote from Elite »

how do u get your mods on the manager?

If you've made a mod for MyCraft, place the class files in the mods folder.
If you've got another mod, install it like you normally would.
Built-in mods are available in the menu.

Quote from xthexder »

Quote from Elite »

how do u get your mods on the manager?

If you've made a mod for MyCraft, place the class files in the mods folder.
If you've got another mod, install it like you normally would.
Built-in mods are available in the menu.

I have a bunch of mods from the forum i want to install. Doesn't Mycraft install it for u? Like i place it in the mod folder and when i launch mycraft its already there on the mod screen and i can just toggle it on an off?

Quote from Elite »

Quote from xthexder »

Quote from Elite »

how do u get your mods on the manager?

If you've made a mod for MyCraft, place the class files in the mods folder.
If you've got another mod, install it like you normally would.
Built-in mods are available in the menu.

I have a bunch of mods from the forum i want to install. Doesn't Mycraft install it for u? Like i place it in the mod folder and when i launch mycraft its already there on the mod screen and i can just toggle it on an off?

Unless the mod is specifically for MyCraft, it will not install the mod for you.
MyCraft only effects MyCraft mods. Although it may end up installing other mods for you in the future.

plz i need help i put my minecraft.jar in the lib folder then try to run mycraft
but it just says plz put minecraft launcher jar file in the lib folder wat do i
do?

Here is a sure fire test that have the correct minecraft.jar in your lib folder.

Doubleclick that minecraft jar you put in lib. If you then see the default minecraft launcher screen then you have the correct minecraft.jar there. Otherwise delete it and redownload the right one from the link provided in the OP.

yes i double click the minecraft jar i put in the lib folder and it DOES launches minecraft but it still wont run mycraft

Unless the mod is specifically for MyCraft, it will not install the mod for you.
MyCraft only effects MyCraft mods. Although it may end up installing other mods for you in the future.

can i have a list of the mycraft mods that there are to add?

Quote from a7xrules9 »

Unless the mod is specifically for MyCraft, it will not install the mod for you.
MyCraft only effects MyCraft mods. Although it may end up installing other mods for you in the future.

can i have a list of the mycraft mods that there are to add?

Be patient; one does not exist yet. I've asked.

goddamnit, i just deleted my bin folder with all my mods and textures in it to get this to learn it doesnt have any mods yet and it doesnt work for me, i followed all the instructions and i click on mycraft.jar and i get something that looks like this:


[] [] [] [] [] [] [] [] [] [] [] [] [] []
[] [] [] [] [] [] [] [] [] [] [] [] [] []
[] [] [] [] [] [] [] [] [] [] [] [] [] []
[] [] [] [] [] [] [] [] [] [] [] [] [] []

except all black, even the middle

sick it works thanks man :smile.gif: btw could you update you page with ever mod that becomes compatible with mycraft?

thanks man!

Quote from carter36 »

sick it works thanks man :smile.gif: btw could you update you page with ever mod that becomes compatible with mycraft?

thanks man!

Once we finish the big upgrade there will be a list posted =)

In the mean time:
I've fixed a small bug where if you type v in the chat, it will still turn on flying.
Should be fixed now.

Could someone make a video on how to install it? Im major confused.

Awesomesauce. One problem. In the fly mode. When you try to land and ur like right above the ground. it kills you. Can you fix this?

Quote from Burns2211 »

Awesomesauce. One problem. In the fly mode. When you try to land and ur like right above the ground. it kills you. Can you fix this?

This only happens in SMP. IT can't be fixed because it's server side.
The damage is determined based on how high you went.
So if you go super high up, and land really slowly on the same spot, you'll still die.
My advice, is only ever land higher than you started.

What other mods are going to be added?