Minecraft Forums

OK, so when I try to open Minecraft i get this:

No JVM could be found on your system.
Please define EXE4J_JAVA_HOME to point to an installed 32-bit JDK or JRE or download a JRE from www.java.com

When I install Java 32-bit, it works perfectly... however I want to use 64-bit Java because if I have 32 and 64 then FTB will also automatically use 32-bit and it is not enough for FTB.

But basically I want to be able to play Minecraft on Java 64-bit.

I do have a 64-bit system.

Plus it wont even let me see the launcher... I click Minecraft and before anything happens the message pops up.

I have tried re-installing Minecraft. I have tried re-installing Java. I have tried deleting all files that have to do with Minecraft and Java. I have tried using Jarfix. And nothing has worked.

Minecraft works perfectly on 32-bit, but then again I want to play it on 64-bit.


Please Help... Thanks

Sorry for double posting...

My Specs:

Processor: Intel Core i5-2300 CPU @ 2.80GHz 2.80 GHz
RAM: 4GB
64-Bit System


And I do have the latest version of Java (Java 7 Update 21)

Quote from Tedster

Uninstall every version of Java you can find in Add or Remove Programs and install 64-bit Java only.

I have allready done that. Right now the only Java installed on my PC is Java 7 Update 21 (64-bit)

Quote from Tedster

Hmm.
Do you have any JDKs?
I suggest you only have JRE Version 7, update 21.

No, I don't have JDK, I only have JRE Version 7 Update 21.

Quote from Tedster

Sorry, I'm kinda clueless.
See if anyone else will come along/help.

Ok...

Thanks anyway

PLEASE HELP

Have you tried Java 64-bit offline?
http://www.java.com/en/download/manual.jsp
Here's the link for Java JDK
http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html

Try them

Quote from DenialSam

Have you tried Java 64-bit offline?
http://www.java.com/...load/manual.jsp
Here's the link for Java JDK
http://www.oracle.co...ds-1880260.html

Try them

Ok, so I just tried both but none worked

Can you make sure you don't have any stray java.exe or javaw.exe binaries on your computer that don't belong to the version that you have installed? One place to check is Windows\system32

The other possibility is that at some point in time you didn't uninstall java 'correctly' and there is still some reference in the registry to this now deleted java install.

Quote from gerbil

Can you make sure you don't have any stray java.exe or javaw.exe binaries on your computer that don't belong to the version that you have installed? One place to check is Windows\system32

The other possibility is that at some point in time you didn't uninstall java 'correctly' and there is still some reference in the registry to this now deleted java install.

Now I tried deleting all java.exe and javaw.exe files that are not in C:/Program Files (x86)/Java or C:/Program Files (x64)/Java and no, it still didn't work.

And how do I make sure there is no reference in the registry to the deleted Java?

There's this: https://www.java.com/en/download/help/regkey_addremove.xml
and this: https://www.java.com/en/download/help/manual_regedit.xml
and this: http://stackoverflow.com/questions/5415485/remove-jre-entries-from-windows-registries

Quote from gerbil

There's this: https://www.java.com...y_addremove.xml
and this: https://www.java.com...ual_regedit.xml
and this: http://stackoverflow...dows-registries

Didn't Work

I'm not familiar with gerbil's links, however you might try running a registry cleaner. I like to use CCleaner.

I recommend you do the following steps in order:

1. Uninstall all Java installs
2. Remove minecraft install files (keep your saves folder of course)
3. Run registry cleaner (make registry backup just in case)
4. Run registry cleaner a second time to make sure scan looks clean (may find more files after initial scan&removal)
5. Reinstall Java JRE 64bit
6. Download fresh copy of the minecraft launcher and place on desktop
7. Put exceptions in your Antivirus/firewall for the minecraft.exe and Javaw.exe file locations.
8. Attempt to launch minecraft.

If it still doesn't launch with the same error then something really strange is going on with your PC. Perhaps try making a new user account and try installing minecraft there and try to launch as a test.

Quote from rodabon

I'm not familiar with gerbil's links, however you might try running a registry cleaner. I like to use CCleaner.

I recommend you do the following steps in order:

1. Uninstall all Java installs
2. Remove minecraft install files (keep your saves folder of course)
3. Run registry cleaner (make registry backup just in case)
4. Run registry cleaner a second time to make sure scan looks clean (may find more files after initial scan&removal)
5. Reinstall Java JRE 64bit
6. Download fresh copy of the minecraft launcher and place on desktop
7. Put exceptions in your Antivirus/firewall for the minecraft.exe and Javaw.exe file locations.
8. Attempt to launch minecraft.

If it still doesn't launch with the same error then something really strange is going on with your PC. Perhaps try making a new user account and try installing minecraft there and try to launch as a test.

still doesnt work

Quote from trajano080

still doesnt work

You need to go into your control panel then click on system and security then click on system then click on advanced system settings then enviromental variables then find path on the list on the bottom, then click on it and press edit. then delete anything you see except for the name Path and put %SystemRoot%\system32;%SystemRoot%;C:\Program Files (x86)\Java\jre7\bin\ That should work if not reply with your skype. I had the same problem.

If it works pls sub to me on youtube: www.youtube.com/thegamerofbacon

As crazybacon said above, it's a system path problem. Try doing what he said.