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Java alternatives (Ubuntu)
Check defaults
Add a new java alternative to the system
Configure java alternatives
Set JAVA_HOME
Check defaults
Note that these folders may not exist yet in your computer!
$ ls -al /usr/bin/java lrwxrwxrwx 1 root root /usr/bin/java -> /etc/alternatives/java
$ ls -al /etc/alternatives/java lrwxrwxrwx 1 root root /etc/alternatives/java -> /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java
$ ls -al /usr/lib/jvm/default-java lrwxrwxrwx 1 root root /usr/lib/jvm/default-java -> java-1.7.0-openjdk-amd64
Add a new java alternative to the system
sudo update-alternatives --install "/usr/bin/java" "java" "/opt/jdk1.8.0_66/bin/java" 1
$ update-alternatives --display java java - auto mode link currently points to /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java /opt/jdk1.8.0_66/bin/java - priority 1 /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java - priority 1071 slave java.1.gz: /usr/lib/jvm/java-7-openjdk-amd64/jre/man/man1/java.1.gz Current 'best' version is '/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java'.
Configure java alternatives
$ sudo update-alternatives --config java There are 2 choices for the alternative java (providing /usr/bin/java). Selection Path Priority Status ------------------------------------------------------------ * 0 /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java 1071 auto mode 1 /opt/jdk1.8.0_66/bin/java 1 manual mode 2 /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java 1071 manual mode Press <enter> to keep the current choice[*], or type selection number: 1 update-alternatives: using /opt/jdk1.8.0_66/bin/java to provide /usr/bin/java (java) in manual mode
Set JAVA_HOME
export JAVA_HOME=$(readlink -f /usr/bin/java | sed "s:bin/java::")
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