Linux under Jdk/maven/tomcat

The Debian-installed OPENJDK includes only the JRE and no Tools.jar,dt.jar, so install the OPENJDK full version.

sudo apt-get install openjdk-8-jdk

If you have multiple versions of Java installed in your operating system, you can use the following command to select a specific Java:

sudo update-alternatives--config java

There is 2 choices for the alternative Java (Providing/usr/bin/java).

Selection Path Priority Status
------------------------------------------------------------
* 0/usr/lib/jvm/java-6-openjdk-amd64/jre/bin/java 1061 Auto mode
1/usr/lib/jvm/java-6-openjdk-amd64/jre/bin/java 1061 Manual Mode
2/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java 1051 Manual Mode

Press ENTER to keep the current choice[*], or type selection number:

Configuring MAVEN,TOMCAT Environment variables

Linux under Jdk/maven/tomcat