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[Truxton Fulton <935556@xxxxxxxxxxxxxxxxxx>]

This issue is solved by adding /usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64 to the library path :
export LD_LIBRARY_PATH="/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64"
(or /etc/ld.so.conf.d/)

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which is subscribed to openjdk-7 in Ubuntu.
https://bugs.launchpad.net/bugs/935556

Title:
  minecraft crash with openjdk-7, some sort of search path issue.

Status in “openjdk-7” package in Ubuntu:
  Invalid

Bug description:
  running minecraft in openjdk-7, even though there are 64bit libraries
  available, it tries to link to the 32bit ones.  This is on a 64bit
  machine.

  Exception in thread "Minecraft main thread" java.lang.UnsatisfiedLinkError: /home/peter/.minecraft/bin/natives/liblwjgl.so: /home/peter/.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(ClassLoader.java:1924)
  	at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1821)
  	at java.lang.Runtime.load0(Runtime.java:792)
  	at java.lang.System.load(System.java:1059)
  	at org.lwjgl.Sys$1.run(Sys.java:69)
  	at java.security.AccessController.doPrivileged(Native Method)
  	at org.lwjgl.Sys.doLoadLibrary(Sys.java:65)
  	at org.lwjgl.Sys.loadLibrary(Sys.java:81)
  	at org.lwjgl.Sys.<clinit>(Sys.java:98)
  	at org.lwjgl.opengl.Display.<clinit>(Display.java:132)
  	at net.minecraft.client.Minecraft.a(SourceFile:180)
  	at net.minecraft.client.Minecraft.run(SourceFile:648)
  	at java.lang.Thread.run(Thread.java:722)
  peter@basquette:~/.minecraft-/bin/natives$

  The libraries are here:

  peter@basquette:~/.minecraft/bin/natives$ ls -al
  total 1756
  drwxrwxr-x 2 peter peter   4096 Feb 18 11:37 .
  drwxrwxr-x 3 peter peter   4096 Feb 18 11:37 ..
  -rw-rw-r-- 1 peter peter  14512 Feb 18 11:37 libjinput-linux64.so
  -rw-rw-r-- 1 peter peter  13824 Feb 18 11:37 libjinput-linux.so
  -rw-rw-r-- 1 peter peter 463736 Feb 18 11:37 liblwjgl64.so
  -rw-rw-r-- 1 peter peter 358360 Feb 18 11:37 liblwjgl.so
  -rw-rw-r-- 1 peter peter 525203 Feb 18 11:37 libopenal64.so
  -rw-rw-r-- 1 peter peter 400561 Feb 18 11:37 libopenal.so
  peter@basquette:~/.minecraft/bin/natives$ file *
  libjinput-linux64.so: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, stripped
  libjinput-linux.so:   ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
  liblwjgl64.so:        ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, stripped
  liblwjgl.so:          ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, BuildID[sha1]=0x12e2a38b02f687627f2809dea133576da1ee9e06, stripped
  libopenal64.so:       ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, not stripped
  libopenal.so:         ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, not stripped
  peter@basquette:~/.minecraft/bin/natives$ 

  openjdk-6 used to find them without issue, but openjdk 7 crashes

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: openjdk-7-jre 7~b147-2.0-1ubuntu2
  ProcVersionSignature: Ubuntu 3.2.0-16.25-generic 3.2.6
  Uname: Linux 3.2.0-16-generic x86_64
  ApportVersion: 1.91-0ubuntu1
  Architecture: amd64
  Date: Sat Feb 18 12:02:00 2012
  InstallationMedia: Ubuntu-Server 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: openjdk-7
  UpgradeStatus: Upgraded to precise on 2012-01-15 (34 days ago)

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