Re: Can I detect Java version before my java program starts?

[TitanRebel <TitanRebel@xxxxxxxxxxx>]

Thanks for the suggestions and the logic!

Now, does anyone know of a way to determine which version is going to be 
used?  I don't think it automatically uses the highest version (am I 
wrong?)  It seems to be different based on version, release, and 
modification of OS400.

I guess I could find out what the default is for each VRM of OS400 and 
add logic to the script to take this into account.  Then I would also 
have to look for the existance of .props files (I forget the location 
and names right now) that could also determine which version is going to 
be used.  I was just hoping there was an "easier" way to tell.

Thanks,

Ken


Bruce Jin wrote:
> You can try these two methods:
>
> 1. In CL check the folder existence to decide if a particular JDK 
> version is installed. E.g. /QIBM/ProdData/Java400/jdk14 is the location 
> of JDK 1.4.
> 2. If you call qshell scripts in CL you can check installed JDK using 
> something like this:
> jdk14=/QIBM/ProdData/Java400/jdk14
> jdk13=/QIBM/ProdData/Java400/jdk13
> jdk12=/QIBM/ProdData/Java400/jdk12
> if cd $jdk14
>   then jv=4
> elif cd $jdk13
>   then jv=3
> elif cd $jdk12
>   then jv=2
> else
>   echo Connot find $jdk12 or $jdk13 or $jdk14!
> fi
> jdk=/QIBM/ProdData/Java400/jdk1$jv
> echo Found JDK 1.$jv, use $jdk.
> export -s JAVA_HOME=$jdk
>
> I hope someone has better ways to do this.
>
> Bruce