Help Error in Client
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Td_rippah
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Auto detecting java
Testing default folder
Checking C:\Program Files\Java\jre6 folder
Found java in C:\Program Files\Java\jre6 folder
Checking C:\Program Files\Java\jdk1.6.0_23 folder
Found java in C:\Program Files\Java\jdk1.6.0_23 folder
Starting java from "C:\Program Files\Java\jdk1.6.0_23\bin\java.exe"
Exception in thread "main" java.lang.NoClassDefFoundError: com/mojang/minecraft/
MinecraftApplet
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Caused by: java.lang.ClassNotFoundException: com.mojang.minecraft.MinecraftApple
t
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
... 12 more
Could not find the main class: Main. Program will exit.
ERROR: Failed to run minecraft
JAVA6="C:\Program Files\Java\jdk1.6.0_23\bin\java.exe"
Press any key to continue . .

Please Help :/

Nucleardonkey
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Did you add Minecraft.jar

Did you add Minecraft.jar into the lib folder?

Td_rippah
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Yeah !

Yeah i have also got the latest java

kman222
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client wont start

my World of Minecraft client just updated today and then i started it so this comes up at
Autodetecting java
Testing x86 folder
Checking C:\Program Files (x86)\Java\jre6 folder
Found java in C:\Program Files (x86)\Java\jre6 folder
Starting java from "C:\Program Files (x86)\Java\jre6\bin\java.exe"

oh looks like all is well then this comes up

Exception in thread "main" java.lang.NoClassDefFoundError: com/mojang/minecraft/
MinecraftApplet
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(Unknown Source)
        at java.security.SecureClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.access$000(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Caused by: java.lang.ClassNotFoundException: com.mojang.minecraft.MinecraftApplet
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClassInternal(Unknown Source)
        ... 12 more
Could not find the main class: Main.  Program will exit.
ERROR: Failed to run minecraft
JAVA6="C:\Program Files (x86)\Java\jre6\bin\java.exe"
Press any key to continue . . .

oh and yes i have the minecraft.jar in the lib
and the error comes up befor the logon thing comes and it wont even pop up
wtf is going on

lopufi
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bump

for same problem.
because SMP anc classic multiplayer is full of bugs and SUCKS for that

Woodsy_Craft
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...

Are you all dumb? You need to re-download the .jar.

Unfortunately my internet cuts out when joining servers ever since I re-downloaded it.

Golden.
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Same

I've been using World of Minecraft for 2 months now, never had a problem

But today i run it and run.bat says this:
Autodetecting java
Testing x86 folder
Checking C:\Program Files (x86)\Java\jre6 folder
Found java in C:\Program Files (x86)\Java\jre6 folder
Starting java from "C:\Program Files (x86)\Java\jre6\bin\java.exe"
Exception in thread "main" java.lang.NoClassDefFoundError: com/mojang/minecraft/
MinecraftApplet
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClassCond(Unknown Source)
        at java.lang.ClassLoader.defineClass(Unknown Source)
        at java.security.SecureClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.access$000(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
Caused by: java.lang.ClassNotFoundException: com.mojang.minecraft.MinecraftApple
t
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        ... 12 more
Could not find the main class: Main.  Program will exit.
ERROR: Failed to run minecraft
JAVA6="C:\Program Files (x86)\Java\jre6\bin\java.exe"
Press any key to continue . . .
The minecraft.jar is in lib folder
I Have tried re download both World of Minecraft and Minecraft.jar but it still doesn't work..

booloveblankie
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Same issue here.Only after 

Same issue here.
Only after  update. Have redownloaded World of Minecraft and added added minecraft.jar into lib.