Re: Calling Java from RPG

["Nick Arndt" <nick.arndt@xxxxxxxxx>]

Our system is set to 1.4.2, I also to be sure issued the
 QIBM_RPG_JAVA_PROPERTIES) VALUE('-Djava.version=1.4;') to my program.  My
java project has a compile version of 1.4

The auto generate java prototypes is very cool in RDi, have to use that from
now on.

Any idea why i would still be getting this class version error when as far
as I can tell everything is running on the same version.

Thanks for your help.

On Wed, Oct 29, 2008 at 6:09 PM, Scott Klement <rpg400-l@xxxxxxxxxxxxxxxx>wrote:

> hi Nick,
>
> Nick Arndt wrote:
> > I now can find my class, but it gives me a
> > java.lang.UnsupportedClassVersionError
>
> This means that the version of Java the class was compiled for isn't
> compatible with the version of the JVM you're trying to run it on.  For
> example, if you compiled it for version 1.4, it may not run on a 1.1.8
> JVM since the 1.4 version might be using functionality that was not
> available in 1.1.8.
>
> I'd start by determining which versions of Java are installed on your
> machine.  GO LICPGM option 10 should tell you that (you may have to
> scroll down... look for the 57xxJV1 entries)
>
> If you have more than one installed, you may need to control which one
> gets started.  Please be aware that the version reported in QShell when
> running "java -version" is not necessarily the same one that RPG decides
> to use.  I'm not sure why that's the case, but they're not always the same.
>
> You can control which version of the JVM gets run using the
> QIBM_RPG_JAVA_PROPERTIES environment variable.  Something like this
> might work:
>
> ADDENVVAR ENVVAR(QIBM_RPG_JAVA_PROPERTIES) VALUE('-Djava.version=1.4;')
>
> In this case, I'm instructing RPG to load version 1.4 of the JVM. Note
> that you have to specify -Djava.version=1.5 (not 5.0) in order to get
> Java 5.0 to load.  Sun used the number 1.5 internally, but marketed the
> product under the moniker "5.0"... which is a little confusing...  but,
> rest assured that -Djava.version=1.5 will give you version 5.0.  (I
> haven't tried it, but I believe the same is true for 6.0, you have to
> specify version=1.6)
>
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