How to downgrade Java from 9 to 8 on a MACOS Eclipse is not running with Java 9

Question

How to downgrade Java from 9 to 8 on a macOS Sierra 10 12 6 16G29    I tried removing the Java plugin and installed Java 8  however the Java and javac version shows 9 in terminal  but In system preferences it is 8  Thanks in advance

User · Answer

Old question but just had that problem  dumb jira having problems with java 10  and didn t find a simple answer here so just gonna leave it      usr libexec java home -V shows the versions installed and their locations so you can simply remove  Library Java JavaVirtualMachines  lt the version you want to remove gt   Voila

User · Answer

You don t need to down grade  You can run more than one version of Java on MacOS  You can set the version of your terminal with this command in MacOS     List Java versions installed  usr libexec java home -V    Java 11 export JAVA HOME    usr libexec java home -v 11     Java 1 8 export JAVA HOME    usr libexec java home -v 1 8     Java 1 7 export JAVA HOME    usr libexec java home -v 1 7     Java 1 6 export JAVA HOME    usr libexec java home -v 1 6    You can set the default value in the  bashrc   profile  or  zprofile

User · Answer

If you have multiple Java versions installed on your Mac  here s a quick way to switch the default version using Terminal  In this example  I am going to switch Java 10 to Java 8     java -version java version  10 0 1  2018-04-17 Java TM  SE Runtime Environment 18 3  build 10 0 1 10  Java HotSpot TM  64-Bit Server VM 18 3  build 10 0 1 10  mixed mode      usr libexec java home -V Matching Java Virtual Machines  2       10 0 1  x86 64   Java SE 10 0 1      Library Java JavaVirtualMachines jdk-10 0 1 jdk Contents Home     1 8 0 171  x86 64    Java SE 8   Library Java JavaVirtualMachines jdk1 8 0 171 jdk Contents Home   Library Java JavaVirtualMachines jdk-10 0 1 jdk Contents Home   Then  in your  bash profile add the following     Java 8 export JAVA HOME  Library Java JavaVirtualMachines jdk1 8 0 171 jdk Contents Home   Now if you try java -version again  you should see the version you want     java -version java version  1 8 0 171  Java TM  SE Runtime Environment  build 1 8 0 171-b11  Java HotSpot TM  64-Bit Server VM  build 25 171-b11  mixed mode

User · Answer

As it allows to install more than one version of java  I had install many 3 versions unknowingly but it was point to latest version  11 0 2   I could able to solve this issue with below steps to move to  1 8    java -version   openjdk version  11 0 2  2019-01-15 OpenJDK Runtime Environment 18 9  build 11 0 2 9  OpenJDK 64-Bit Server VM 18 9  build 11 0 2 9  mixed mode   cd  Library Java JavaVirtualMachines ls   jdk1 8 0 201 jdk    jdk1 8 0 202 jdk    openjdk-11 0 2 jdk  sudo rm -rf openjdk-11 0 2 jdk sudo rm -rf jdk1 8 0 201 jdk ls   jdk1 8 0 202 jdk  java -version   java version  1 8 0 202-ea  Java TM  SE Runtime Environment  build 1 8 0 202-ea-b03  Java HotSpot TM  64-Bit Server VM  build 25 202-b03  mixed mode

User · Answer

This is how I did it  You don t need to delete Java 9 or newer version   Step 1   Install Java 8  You can download Java 8 from here  http   www oracle com technetwork java javase downloads jdk8-downloads-2133151 html  Step 2  After installation of Java 8  Confirm installation of all versions Type the following command in your terminal    usr libexec java home -V   Step 3  Edit  bash profile  sudo nano    bash profile   Step 4  Add 1 8 as default   Add below line to bash profile file    export JAVA HOME    usr libexec java home -v 1 8    Now Press CTRL X to exit the bash  Press  Y  to save changes   Step 5  Reload bash profile  source    bash profile   Step 6  Confirm current version of Java  java -version

User · Answer

You can remove  JavaAppletPlugin plugin  found in Spotlight or Finder  then re-install downloaded Java 8   This will simply solve your problem

User · Answer

The simplest solution might be to install Java 8 in parallel to Java 9  if not still still existant  and specify the JVM to be used explicitly in eclipse ini  You can find a description of this setting including a description how to find eclipse ini on a Mac at Eclipsepedia

[java] How to downgrade Java from 9 to 8 on a MACOS. Eclipse is not running with Java 9

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