xlinsist xlinsist - 3 months ago 28
Java Question

JDK Version inconsistent

My os is Ubuntu 16.04 LTS.

$ cat /etc/profile # part content of this file
JAVA_HOME=/usr/local/java/jdk1.8.0_101
JRE_HOME=$JAVA_HOME/jre
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
export JAVA_HOME
export JRE_HOME
export PATH

$ echo $JAVA_HOME
/usr/local/java/jdk1.8.0_101

$ java -version
java version "1.7.0_79"
Java(TM) SE Runtime Environment (build 1.7.0_79-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)

$ ls /usr/local/java/
jdk1.7.0_79/ jdk1.8.0_101/


Why is my java version still jdk7?

Answer

Ubuntu has ability to work with multiple java versions. In your case, it just means that it has both JDK 7 and JDK 8 installed in your system but is using JDK 7.

To switch from one java version to another, you can use sudo update-alternatives --config java. This will list all JDKs installed in your system, just enter the number corresponding to JDK 8 and it should switch to JDK 8.

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