LINUX

Java and Maven Install

Installing Latest Oracle Java and Maven. Optionally, you could use SDKMAN CLI and API for installing, switching, removing Java and/or Maven.

Install Oracle Java

Java SE Development Kit 11 LTS release official download page

Extract / install the rpm archive. e.g.,

sudo rpm -Uvh jdk-11.0.5_linux-x64_bin.rpm

Verify that the installed version is is configured as the default Java

sudo alternatives --config java

Verify and/or select the Java from the rpm archive. e.g. 4,

There are 4 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
   1           java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.222.b10-0.fc30.x86_64/jre/bin/java)
   2           java-11-openjdk.x86_64 (/usr/lib/jvm/java-11-openjdk-11.0.4.11-0.fc30.x86_64/bin/java)
   3           java-latest-openjdk.x86_64 (/usr/lib/jvm/java-13-openjdk-13.0.0.33-1.rolling.fc30.x86_64/bin/java)
*+ 4           /usr/java/jdk-11.0.5/bin/java

Enter to keep the current selection[+], or type selection number:

Verify again w/ java -version

java -version

java version "11.0.5" 2019-10-15 LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.5+10-LTS)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.5+10-LTS, mixed mode)

Application Environment

Application environment setup using /etc/profile.d/*

When a user logs in, environment variables are set from various places. That includes /etc/profile (for all users).

Then all the shell script (.sh) files in the /etc/profile.d directory.

Then ~/.bash_profile, then ~/.bashrc.

Setup Java Environment Variables

Add these to a shell script in /etc/profile.d. e.g.,

java.sh

export JAVA_HOME=$(dirname $(dirname $(readlink $(readlink $(which javac)))))
export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=.:$JAVA_HOME/jre/lib:$JAVA_HOME/lib:$JAVA_HOME/lib/tools.jar

source the file or logout and back in

source /etc/profile.d/java.sh

verify

echo $JAVA_HOME
echo $PATH
echo $CLASSPATH

Install Maven

Verify the release version you want to install at the Maven Download page. Then you can either download from the page or use wget from the directory where it will be installed. e.g.,

cd /opt
sudo wget https://www-eu.apache.org/dist/maven/maven-3/3.6.2/binaries/apache-maven-3.6.2-bin.tar.gz

sudo tar xzf apache-maven-3.6.2-bin.tar.gz

Symlink maven

sudo ln -s apache-maven-3.6.2 maven

Create shell script in profile.d

sudo nano /etc/profile.d/maven.sh

Add these exports to /etc/profile.d/maven.sh

export M2_HOME=/opt/maven
export PATH=${M2_HOME}/bin:${PATH}

Source the file or logout and back in

source /etc/profile.d/maven.sh

verify

mvn --version

Apache Maven 3.6.2 (40f52333136460af0dc0d7232c0dc0bcf0d9e117; 2019-08-27T11:06:16-04:00)
Maven home: /opt/maven
Java version: 11.0.5, vendor: Oracle Corporation, runtime: /usr/java/jdk-11.0.5
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "5.3.5-200.fc30.x86_64", arch: "amd64", family: "unix"

Lastly, delete the download archive

sudo rm apache-maven-3.6.2-bin.tar.gz

Maven Settings

The settings.xml file may live in:

  • Maven install, /opt/maven/conf/settings.xml
  • User Home: ${HOME}/.m2/settings.xml

If both files exists, their contents gets merged, with the user settings.xml being dominant.

To create user-specific settings from scratch, copy the global settings from the Maven installation to your ${HOME}/.m2/

comments powered by Disqus