You can see and can find your home directory! Readlink symbolicLink => Will give what it resolve toįrom the help doc -f, -canonicalize canonicalize by following every symlink inĮvery component of the given name recursively Readlink - print resolved symbolic links or canonical file names We can do that through read link Readlink Symlink => Symlink => Actual folder or file If you want to use whereis! One need to resolve the symlinks too! And here recursively! usr/lib/jvm/java-10-openjdk-amd64/bin/java is the actual java binary! And /usr/lib/jvm/java-10-openjdk-amd64 is the java home. usr/bin/java =symlink to=> /etc/alternatives/java =symlink to=> /usr/lib/jvm/java-10-openjdk-amd64/bin/java Which java => give Command path => return a symlink to a symlink It'd look something like:įirst whereis! Just like which doesn't resolve symlinks! You can run ls /usr/lib/jvm/java-11-openjdk-amd64 and it will show the jdk folder content. usr/lib/jvm/java-11-openjdk-amd64/bin/java It returns the path, in my case it returns: Then, in order to locate the jdk folder, run the command below: readlink -f $(which java) I also try giving /usr/share/java to the ghidra installation, but it complains that this is not a valid jdk home directory because it is missing a bin folder.įirst, make sure the installation was done correctly by running java -version, you should see something like: Here is a bunch of jar files? Usually the jdk has a bin folder and so on? So I cd to the first directory, ans look: /usr/share/java$ lsĬommons-logging-1.2.jar java-atk-wrapper.jar pdfbox-1.8.16.jarĬommons-logging-adapters-1.2.jar java_defaults.mk pdfbox.jarĬommons-logging-adapters.jar java_uno.jar ridl-6.4.7.jarĬommons-logging-api-1.2.jar juh-6.4.7.jar ridl.jarĬommons-logging-api.jar juh.jar unoloader-6.4.7.jarĬommons-logging.jar jurt-6.4.7.jar unoloader.jar Java: /usr/bin/java /usr/share/java /usr/share/man/man1/java.1.gz If I now run whereis java: /usr/share/java$ whereis java So, I think cool, and run: sudo apt-get install openjdk-11-jdk JDK 11+ (64-bit) could not be found and must be manually chosen! Thank you for reading, please leave your suggestions in the comments section below.I'm currently trying to install ghidra on my Ubuntu 20.04 machine. Java is essential for many software applications. In this tutorial, we learned how to install and configure Java on Ubuntu 20.04. Verify the $JAVA_HOME environment: $ echo $JAVA_HOME Reload the environment file to apply the changes: $ source /etc/environment In order to set the $JAVA_HOME variable, you need to use the’update-alternatives’ command to find the Java installation directory.įor example, Oracle Java is located in “/usr/lib/jvm/java-11-oracle/bin/”.Īdd the path to the “/etc/environment” file JAVA_HOME="/usr/lib/jvm/java-11-oracle/bin/" In many cases, developers must specify the $JAVA_HOME environment variable when building Java programs. To configure the default Java compiler version (javac), let us run: $ sudo update-alternatives -config javac You can do this by running the following command: $ sudo update-alternatives -config javaĮnter the desired option and press Enter to select the desired Java version. The default Java version used by the operating system must be configured. So far, you have installed multiple Java versions on Ubuntu 20.04. Let us accept the Oracle Technology Network License Agreement for Oracle Java SE to complete the installation:Ĭlick the “OK” button to accept the Oracle Technology Network License Agreement Manage multiple Java installations Now, you can install Oracle JDK 11 by running the following command: $ sudo apt install oracle-java11-installer-local $ sudo cp jdk-11.0.8_linux-圆4_ /var/cache/oracle-jdk11-installer-local/ Then, import the signing key to verify the software installation on Ubuntu 20.04: $ sudo apt-key adv -keyserver -recv-keys EA8CACC073C3DB2AĪdd the Java repository to the package source list and update: $ sudo add-apt-repository ppa:linuxuprising/javaĬreate a local directory for the downloaded Oracle JDK installer: $ sudo mkdir -p /var/cache/oracle-jdk11-installer-local/ You must create an account to download the Oracle JDK Installer.Īccept the agreement to download the oracle JDK installerĪfter downloading the Java installer (jdk-11.0.8_linux-圆4_), let us install the “add-apt-repository” command: $ sudo apt install software-properties-common You will be redirected to the login screen of the Oracle website. Select Linux compressed archive and click download:
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