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Rajesh Ganessan
Asked: 2019-04-13 00:46:37 +0800 CST

Downgrading Java 11 to java 8? [duplicate]

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How can i downgrade the java version 11 to java 8. As i need jenkins, current jenkins versoin doesn't support java 11. I need to downgrade.

java downgrade 18.04

1 Answers

  1. Best Answer

    1. You have to install the openjdk-8-jre:

       sudo apt-get install openjdk-8-jre

    2. Next switch to the jre-8 version:

       $ 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-9-openjdk-amd64/bin/java       1500      auto mode
   1            /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java   1500      manual mode
   2            /usr/lib/jvm/java-9-openjdk-amd64/bin/java       1500      manual mode

    3. Add JAVA_HOME variable:

       export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64

    4. check java version:

       $ java -version
 openjdk version "1.8.0_151"
 OpenJDK Runtime Environment (build 1.8.0_151-8u151-b12-0ubuntu0.17.10.2-b12)
 OpenJDK 64-Bit Server VM (build 25.151-b12, mixed mode)

    Same procedure for Oracle java.

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