Update to java 11

Author: davidjumani

source/installguide/building_from_source.rst

@@ -249,7 +249,7 @@ several other dependencies. Note that we recommend using Maven 3.
    $ sudo apt-get update
    $ sudo apt-get install python-software-properties
    $ sudo apt-get update
-   $ sudo apt-get install debhelper openjdk-8-jdk libws-commons-util-java genisoimage libcommons-codec-java libcommons-httpclient-java liblog4j1.2-java maven
+   $ sudo apt-get install debhelper openjdk-11-jdk libws-commons-util-java genisoimage libcommons-codec-java libcommons-httpclient-java liblog4j1.2-java maven
    
 .. note::