It’s a 32 bit Ubuntu OS
rob@laptop:~$ uname -a Linux laptop 3.5.0-37-generic #58~precise1-Ubuntu SMP Wed Jul 10 17:51:56 UTC 2013 i686 i686 i386 GNU/Linux rob@laptop:~$ java -version java version "1.7.0_25" OpenJDK Runtime Environment (IcedTea 2.3.10) (7u25-2.3.10-1ubuntu0.12.04.2) OpenJDK Server VM (build 23.7-b01, mixed mode) rob@laptop:~$ sudo update-alternatives --config java There are 3 choices for the alternative java (providing /usr/bin/java). Selection Path Priority Status 0 /usr/lib/j2re1.6-ibm/jre/bin/java 1200 auto mode 1 /home/rob/Downloads/jre1.7.0_25/bin/java 1 manual mode 2 /usr/lib/j2re1.6-ibm/jre/bin/java 1200 manual mode * 3 /usr/lib/jvm/java-7-openjdk-i386/jre/bin/java 1051 manual mode
I want to be able to run with more than 2g of heap
rob@laptop:~$ java -Xmx3g -jar tool.jar
Error occurred during initialization of VM
Could not reserve enough space for object heap
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.
rob@laptop:~$ free -g
total used free shared buffers cached
Mem: 15 2 12 0 0 1
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Answer
No. A 32-bit kernel(and likely 32-bit CPU as well) cannot run a 64-bit executable for the JVM(or any other 64-bit executable/ELF) with your choice of OS and kernel.