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javalinuxeclipselinux-mint

How to use Different Java versions eclipse in Linux mint?

I have many Java versions installed on my laptop.

$ sudo update-alternatives --config java
[sudo] password for naruto: 
There are 3 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                                            Priority   Status
------------------------------------------------------------
  0            /usr/lib/jvm/java-9-oracle/bin/java              1091      auto mode
  1            /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java   1081      manual mode
* 2            /usr/lib/jvm/java-8-oracle/jre/bin/java          1081      manual mode
  3            /usr/lib/jvm/java-9-oracle/bin/java              1091      manual mode

I had installed openjdk8 as sudo apt-get install openjdk-8-jdk

oracle jdk8 by

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer

and oracle jdk9 by

sudo apt-get install oracle-java9-installer

I want to create new Java program which usages Oracle Java 8 or 9 (whenever I select Java 9 by sudo update-alternatives --config java Eclipse doesn't lunch. I don't why that is happening) but Eclipse uses openjdk8.

enter image description here

So How can I create new Project with Oracle Java 8 in Eclipse (or 9 if possible)?

Solution

  • You may even set a different Java version for each project:

    Open project's properties:

    • Java Build Path > Libraries > Add Library > JRE System Library (I recommend to chose always an "execution evironment").
    • Java Compiler > Check "Enable project settings", uncheck "Use compliance from execution environment..." and chose your preferred value from the dropdown.
    • Project facets > Java: Set the same value from the dropdown.

    Always keep these three parameters set to the same Java version on each project.