Install Java on WSL2

Install a default version for current Ubuntu WSL2

Execute the following commands to install default Java:

  sudo apt update
  sudo apt search jdk
  sudo apt install default-jdk

Alternatively, if you want to install a specific version, sepecify a package as the following command:
Terminal window
```
  sudo apt install openjdk-8-jdk
```

Edit .bashrc file to export JAVA_HOME variable:

  sudo vi ~/.bashrc
  export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64

Open a new terminal session and verify if we have set Java home correclty
Terminal window
```
  java --version
```

Download Gradle to /tmp folder:

  wget https://services.gradle.org/distributions/gradle-7.3.3-bin.zip -P /tmp

Extract zip file to /opt/gradle:

  sudo apt install unzip
  sudo unzip -d /opt/gradle /tmp/gradle-*.zip

  ls /opt/gradle/gradle-7.3.3/

You should see some Gradle files.
Set up environment variable by creating gradle.sh:
Terminal window
```
  sudo vi /etc/profile.d/gradle.sh
```

Add the follwing content to gradle.sh

  export GRADLE_HOME=/opt/gradle/gradle-7.3.3
  export PATH=${GRADLE_HOME}/bin:${PATH}

Make the script executable:

  sudo chmod +x /etc/profile.d/gradle.sh

Load the environment variable
Terminal window
```
  source /etc/profile.d/gradle.sh
```
Verify if Gradle has been installed successfully:
Terminal window
```
  gradle -v
```