Java Versions
        
        from Java 1.x thru Java 10.x 
        Java came in 2 parts:
        
        1) a Java Runtime, that lets you run Java, but not write it
            this is a Java JRE (Java Runtime Enviroment)
        2) a Java Development Enviroment, that lets you write
            and compile Java this is a Java JDK
            
        IBM supports a number of Java versions, BUT not all versions
        
        Java comes out with a new version (release) every 6 months
        there are Long Term Support version, these are the versions
        the IRS and IBM support. (long Term Support - LTS)
         are Java 8  <- this the verison on the IBM Mainframe
             Java 11 <- this is the version the IRS is using on Tier II (linux servers)
             Java 17
             Java 21
             
             
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       I need a Java tool (an IDE Integrated Development Enviroment)
       that lets me write/test/etc Java
       
       there are a number of these
       the IRS uses Eclipse
       
       Eclipse is open-source and these are a number of Eclipse based tools
       
       the IRS uses 3 versions of Eclipse
       
       1) basic Eclipse to code Core Java
       2) CodeReady Studio (Eclipse w/ add-on for JBoss) to code Web Based Appl
            for Tier II
       3) Rational Development for z/Systems (Eclipse w/ IBM add-ons)
            to code IBM Based Appl for Tier I (RDz)