Re: Setting default JDK and level

And to add to this a bit:

There is a good reference to earlier versions as well you can find here:

http://www-01.ibm.com/support/docview.wss?uid=nas1699c5bd1f701d04e862568f1006c7483

What blew me up just today on V5R4M0 was that the SystemDefault.properties file cannot have any leading spaces on the lines else the rest of the line is ignored (hard to see with EDTF after a cut and paste). Also, if you set the JAVA_HOME environment variable in CL (for example) it is ignored, unless you have java.version=1.5 in SystemDefault.properties, which I discovered when I set JAVA_HOME to '/QIBM/ProdData/Java400/jdk15' in CL with ADDENVVAR and the app still blew up until I changed the setting in the properties file (which then made the environment variable redundant because setting java.version=1.5 sets it to Classic Java 5 anyway). I was trying to make the JVM setting "fool proof" but the environment variable route won't help with classic.

Seems like 6.1 is finally getting it right.

Maybe a wiki entry would help....

Pete

Joe Pluta wrote:

Which technically means that JDK 1.4 is never the default JVM unless it is the *only* JVM.

Not that anybody cares about JDK1.4, but I'm always intrigued by logic puzzles. You know, like the one where "Bob drives a blue car. Jim and Bill work downtown. Mary lives in the red house. John is Bill's brother. Joann is married to Bob." And then you have to figure out who is married to whom, which house they live in and what color their car is.

Joe

There is a pecking order in V6R1 of which JVM is used if you have installed more that one. At least, that how I read this page:

http://publib.boulder.ibm.com/infocenter/iseries/v6r1m0/index.jsp?topic=/rzaha/multjdk.htm

It includes this statement:

Note: If you install only one JDK, the default JDK is the one you installed. If you install more than one JDK, the following order of precedence determines the default JDK:Start of change

1. Option 8 - IBM Technology for Java 5.0 32-bit
2. Option 9 - IBM Technology for Java 5.0 64-bit
3. Option 7 - Classic 5.0
4. Option 11- IBM Technology for Java 6 32-bit
5. Option 12 - IBM Technology for Java 6 64-bit
6. Option 10 - Classic 6
7. Option 6 - Classic 1.4

Sam