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Setting Java

Choose between different JVM

sudo update-alternatives --config java

How to install Sun Java on Ubuntu?

Extracted commands

  1. Download and extract NOT RPM sefl extracting file I run it in /opt directory

  2. Install it to system

    sudo update-alternatives --install "/usr/bin/java" "java" "/opt/jre1.6.0_30/bin/java" 1

  3. Make it default

    sudo update-alternatives --set "java" "/opt/jre1.6.0_30/bin/java"

How to increase memory for JVM?

java -Xmx512m -jar jarExample.jar

This launches JVM with maximum memory 512MB for an axecution of a jar file