Re: Verify java version when running jar file

hust6 wrote:
> I have a problem that seems simple, but has been stumping me for some
> time.  I have an executable jar file that I have distributed out to
> other people.  It relies on Java 1.4.2, but some of the customers have
> 1.3.  Is there anything that I can do in the Manifest or Java code to
> catch this problem right away, so that the application can fail
> gracefully?  Currently, it just ends up at a NoClassDefFound.
> 
> I would appreciate any suggestions.
> 
> Thanks!

The answer is in the NoClassDefFoundError.  Create a class that you know 
requires 1.4 and catch the NoClassDefFoundError.  If it catches it you 
know that either they are using a version without that class or there is 
some other problem loading the class.  In either case it won't run.

-- 

Knute Johnson
email s/nospam/linux/

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