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I have the following questions on IBM J9 JDK/JRE.
Thank you.
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The SDK is an installable Java package, which contains the Java Application Programming Interface (API). The Java API is a large collection of ready-made classes, grouped into libraries, that help you develop and deploy applications.
Log on as any member of the Administrators group. Access the product DVD or extract the files from the archive file that you downloaded from Passport Advantage. Complete the online instructions as prompted. When you are prompted with the message Install this Java Runtime Environment as the System JVM , click Yes.
To help organizations looking for the most reliable and cost-effective way to support mission-critical Java applications, IBM offers support for OpenJDK, an open source implementation backed by the industry and the developer community.
As McDowell suggested in his comment. You can get the J9 JDK from this link: https://developer.ibm.com/javasdk/downloads/. Specifically..
Linux - https://www.ibm.com/developerworks/java/jdk/linux/download.html
Windows - To get the JDK for windows is a tricky one. You have to download IBM Development Package for Eclipse. This will give you a eclipse Europa (3.3) version, along with J9 JDK version 1.6.
Previously J9 was the recommended VM for running the harmony class files, as their own version of JVM was incomplete. Have a look at this wiki page.
http://en.wikipedia.org/wiki/Apache_Harmony
In the end of November, 2006, the language support provided by these virtual machine was still incomplete, and the build instructions recommended to use IBM's proprietary J9 instead to run the class library test suite. However, this is not necessary anymore (as of July 2007). The DRLVM virtual machine is currently (as of July 2006) under heavy development, so a fast improvement of its features can be expected
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