anchor.diff:  and see output that looks like:
   
   ....
  -java version "1.7.0_25"
  -OpenJDK Runtime Environment (fedora-2.3.10.3.fc17-x86_64)
  -OpenJDK 64-Bit Server VM (build 23.7-b01, mixed mode)
  +openjdk version "1.8.0_181"
  +OpenJDK Runtime Environment (build 1.8.0_181-b15)
  +OpenJDK 64-Bit Server VM (build 25.181-b15, mixed mode)
   ....
   
   If the Java Devlopment Kit (JDK) is setup correctly, you should be able to type:
  
positive.code: === Prerequisites
  
  The only prerequisite to perform the DocBook to PDF conversion is a Java Development Kit (JDK), which includes the Java runtime (and, naturally, an internet connection).
  You can use any recent JDK (i.e., Java SE 6 or better).
  
  If Java runtime (JVM) is setup correctly, you should be able to type:
  
  
negative.code: and see output that looks like:
  
  ....
  javac 1.8.0_181
  ....
  
  If not, you can install a JDK using your system's package manager or by downloading a distribution from the http://www.oracle.com/technetwork/java/javase/downloads/index.html[Java for developers download site].
  