Installing JDK 1.7 on ubuntu server

Follow the following steps to install JDK 1.7 on ubuntu server:


1. Based on your linux architecture, download the proper version from Oracle website (Oracle JDK 1.7)

2. Then, uncompress the jdk archive using the following command:  

tar -xvf jdk-7u65-linux-i586.tar
Or using the following command for 64 bits:
tar -xvf jdk-7u65-linux-x64.tar

3. Create a folder named jvm under (if not exists) using the following command 

sudo mkdir -p /usr/lib/jvm
4. Then, move the extracted directory to /usr/lib/jvm:

sudo mv ~/Downloads/jdk1.7.0_71 /usr/lib/jvm/
5. Run the following commands to update the execution alternatives:

sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.7.0_71/bin/java" 1 sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk1.7.0_71/bin/javac" 1 sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/lib/jvm/jdk1.7.0_71/bin/javaws" 1

6. Finally, you need to export JAVA_HOME variable:

export JAVA_HOME=/usr/lib/jvm/jdk1.7.0_71

or it is better to set JAVA_HOME in .bashrc:

nano ~/.bashrc 

then add the same line:

export JAVA_HOME=/usr/lib/jvm/jdk1.7.0_71

How to download the source code of test jars using Gradle

I just faced a problem while trying downloading the source code of some of test jars. You just need to specify "test-sources" into your classifier.

For example:

compile group:'org.xyz', name:'your-target-main-jar', version:'jar-version', classifier: 'test-sources'

This will download your target main jar (of course with its dependencies) and its test jar associated with the source code.

Also if you are using eclipse, you will need to add the following:

eclipse {
    classpath {
       downloadSources=true
    }
}