Re: executable jars and libraries

Mark Space <>
Mon, 27 Apr 2009 13:41:13 -0700
Jan Helgesen wrote:

Mark Space wrote:

You understand correctly. Jar files cannot contain other jar files
(and access those contained jar files usefully).

So I would have to write custom code to do that then? or was the custom
code for something else?

Yup, check out the OneJar utility, I think that's what you need.

how can a jar file creator know where a particular machine has the
dependencies it expects? or would setting the CLASSPATH environment help
with that?

You don't know where those libraries will show up, and setting the
CLASSPATH environment variable won't help. The "java -jar" command
ignores the CLASSPATH environment variable. I was refering to modifying
the classpath entry of your manifest file, after install when those
paths are determined.

Also, I'm not 100% sure, but I think the JWS installer will set those
paths for you correctly.

I'm not sure of all the reasons why, but it seems Sun was adamant that
this be in control of the user/administrator, not the programmer.

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