Question 300583 in Ubuntu Question posted in
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Where is java installed in ubuntu?

I have installed java with the command:

sudo apt install openkdk-17-jdk

Now I installed gradle, but can’t use it, I have received error:

ERROR: JAVA_HOME is set to an invalid directory: /usr/bin/java

Please set the JAVA_HOME variable in your environment to match the
location of your Java installation.
  • Need to say I have set the variable on my own since the JAVA_HOME wasn’t set.

I have tried all the options:

  • export JAVA_HOME=$(readlink -f $(which java)) (/usr/lib/jvm/java-17-openjdk-amd64/bin/java)
  • export JAVA_HOME=$(which java) (/usr/bin/java)
  • export JAVA_HOME=/usr/share/java

all options from the whereis java:
java: /usr/bin/java /etc/java /usr/share/java /usr/share/man/man1/java.1.gz

  • /usr/bin/java – not a directory
  • /etc/java – contains a security folder and it all
  • /usr/share/java – doesn’t contains a java:
ls /usr/share/java/java*
/usr/share/java/java-atk-wrapper.jar  /usr/share/java/java_defaults.mk  /usr/share/java/javaewah-1.1.7.jar  /usr/share/java/javaewah.jar
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2

Answers


  1. 0

    Using export JAVA_HOME=/usr/share/java will point to the bin folder. This is just a symbolic link to the actual installation folder.

    You should make it if you update it to export JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64.

    Note you should use the root folder.

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  2. 0

    In Ubuntu, Java is commonly installed in the /usr/lib/jvm/ directory.

    To check Java Version: java -version

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