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

On V5R3 JDK 1.4 is the default version.
On V5R2, V5R1 jdk 1.3 is the default even if you have JDK 1.4 installed.

Bruce

TitanRebel wrote:

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