How do I find out my JDK version under Ubuntu Linux operating systems? How do I find out JDK version under any Linux distribution?
Open a command-line terminal (select Applications > Accessories > Terminal), and then type the following command to find out JDK version:
java -version
Sample outputs:
java version "1.6.0_20" OpenJDK Runtime Environment (IcedTea6 1.9.2) (6b20-1.9.2-0ubuntu1~10.04.1) OpenJDK Server VM (build 19.0-b09, mixed mode)
To list all installed jdk version under Ubuntu / Debian Linux, enter:
dpkg --list | grep -i jdk
Sample outputs:
ii default-jdk 1.6-34 Standard Java or Java compatible Development
ii icedtea-6-jre-cacao 6b20-1.9.2-0ubuntu1~10.04.1 Alternative JVM for OpenJDK, using Cacao
ii openjdk-6-jdk 6b20-1.9.2-0ubuntu1~10.04.1 OpenJDK Development Kit (JDK)
ii openjdk-6-jre 6b20-1.9.2-0ubuntu1~10.04.1 OpenJDK Java runtime, using Hotspot JIT
ii openjdk-6-jre-headless 6b20-1.9.2-0ubuntu1~10.04.1 OpenJDK Java runtime, using Hotspot JIT (hea
ii openjdk-6-jre-lib 6b20-1.9.2-0ubuntu1~10.04.1 OpenJDK Java runtime (architecture independe
A Note About RPM Based Linux Distributions
If you are using RPM based distro, try:
$ java -version
$ javac -version
$ rpm -qa | egrep -i "(jdk|jre)"
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Hi,
I updated my system and now I have problems with the new jre, you know how to get back to and old version with apt.
thanks.
sudo update-alternatives –config java
sudo update-alternatives –config javac