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Minecraft not running on Java 7

I cannot get Minecraft to run on Java 7. Right now I have Oracle Java 7 installed with OpenJDK 6 as a backup. When I start Minecraft with Oracle Java 7, it gives me a black screen after login. It runs at a mediocre 45 FPS with OpenJDK 6 (I get 120 FPS on Windows). I've tried OpenJDK 7 too and it doesn't work either. I haven't tried SunJDK 6.

I installed OpenJDK 7 from the Debian Wheezy repo (it's now uninstalled), and I installed Oracle Java 7 following this guide: http://askubuntu.com/questions/56104...cle-java-jre-7.

I've read that Java 7 could give me better performance, so I want to see if I can get either OpenJDK or Oracle Java 7 to work. If I can get 120 FPS on Windows, I should be able to get at least 60 on Linux.

If you want help you need to actually tell us what went wrong. How is "it doesn't work" meant to get you help?

Quote:

Originally Posted by Lumify (Post 4605525)

When I start Minecraft with Oracle Java 7, it gives me a black screen after login.

That's how it doesn't work. If I run it from terminal, I get this after I log in (is that what you meant?):

Code:

27 achievements

174 recipes

Setting user: Lumify, 3704789772431793636

Exception in thread "Minecraft main thread" java.lang.UnsatisfiedLinkError: /home/c3po/.minecraft/bin/natives/liblwjgl.so: /home/c3po/.minecraft/bin/natives/liblwjgl.so: wrong ELF class: ELFCLASS32 (Possible cause: architecture word width mismatch)

        at java.lang.ClassLoader$NativeLibrary.load(Native Method)

        at java.lang.ClassLoader.loadLibrary0(Unknown Source)

        at java.lang.ClassLoader.loadLibrary(Unknown Source)

        at java.lang.Runtime.load0(Unknown Source)

        at java.lang.System.load(Unknown Source)

        at org.lwjgl.Sys$1.run(Sys.java:69)

        at java.security.AccessController.doPrivileged(Native Method)

        at org.lwjgl.Sys.doLoadLibrary(Sys.java:65)

        at org.lwjgl.Sys.loadLibrary(Sys.java:81)

        at org.lwjgl.Sys.<clinit>(Sys.java:98)

        at org.lwjgl.opengl.Display.<clinit>(Display.java:132)

        at net.minecraft.client.Minecraft.a(SourceFile:180)

        at net.minecraft.client.Minecraft.run(SourceFile:648)

        at java.lang.Thread.run(Unknown Source)

It looks like the problem involves elves, but Santa doesn't know anything about it. Any ideas?

well there are plenty of google hits if you'd just searched for that error. This may be of use: http://www.minecraftforum.net/topic/...r-blackscreen/

I've tried that $ export LD_LIBRARY_PATH="/opt/java/jre/lib/amd64" fix already. That's the only fix I can find because it seems to fix everyone's problems. It doesn't work for me.

Thanks for posting by the way.

Well, it definitely is a 32Bit/64Bit problem.
Did you download the correct version for your CPU ? (try "uname -a")
What JVM are you running (try "java -version") ?
Cheers, Tom.

I think it is the right version. I'll show you the Java 6 info and the Java 7 info. I have both installed right now.

Code:

c3po@debian:~$ java -version

java version "1.6.0_24"

OpenJDK Runtime Environment (IcedTea6 1.11pre) (6b24~pre2-1)

OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)

c3po@debian:~$ sudo update-alternatives --config java

[sudo] password for c3po: 

There are 4 choices for the alternative java (providing /usr/bin/java).



  Selection    Path                                            Priority  Status

------------------------------------------------------------

* 0            /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/java  1061      auto mode

  1            /usr/bin/gij-4.4                                1044      manual mode

  2            /usr/bin/gij-4.6                                1046      manual mode

  3            /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/java  1061      manual mode

  4            /usr/lib/jvm/jre1.7.0_03/bin/java                3        manual mode



Press enter to keep the current choice[*], or type selection number: 4

update-alternatives: using /usr/lib/jvm/jre1.7.0_03/bin/java to provide /usr/bin/java (java) in manual mode.

c3po@debian:~$ java -version

java version "1.7.0_03"

Java(TM) SE Runtime Environment (build 1.7.0_03-b04)

Java HotSpot(TM) 64-Bit Server VM (build 22.1-b02, mixed mode)

uname -a gives me this:
Linux debian 3.1.0-7.dmz.1-liquorix-amd64 #1 ZEN SMP PREEMPT Wed Jan 4 21:13:24 CST 2012 x86_64 GNU/Linux

So your Java looks good, 64 Bit VM for 64 Bit system.
It seems the libraries in "/home/c3po/.minecraft/" are 32 Bit.
Does the software you try to run have a specific 64 Bit version ?
Cheers, Tom.

Minecraft should work on both 64 bit and 32 bit. I've used it on Windows with 64 bit Java with no problems.

Maybe there's some leftover files in your home directory ?
Try renaming /home/c3po/.minecraft to something else and re-run / re-install.
Cheers, Tom.

Quote:

Originally Posted by cheesus (Post 4612532)

Maybe there's some leftover files in your home directory ?
Try renaming /home/c3po/.minecraft to something else and re-run / re-install.
Cheers, Tom.

I've tried that several times and it doesn't change anything. I have also tried reinstalling Java 7.

Most people seem to run in on Sun Java6.
You can download Java6 from oracle.com and install it to s special/dedicated directory without affecting the rest of the system, if you download the zip/tgz.
(Java does not NEED to be installed as a Linux package, that's just convenience).

Also, have you already checked
http://java.com/en/download/help/minecraft_error.xml
?

Cheers, Tom.

Sorry about the late reply. Java 6 is currently working, but I'm getting a horrendous framerate. I have read that Java 7 gives better performance, so I want to use that. The game does not leave an error log, and my graphics driver is up to date anyway.

Bump. How can I get Java 7 to work?

Make sure that /opt/java/jre/lib/amd64 is an actual path in your system. On mine I needed to use /usr/lib/jvm/jre1.7.0/lib/amd64

So my script uses

export LD_LIBRARY_PATH="/usr/lib/jvm/jre1.7.0/lib/amd64"