Peter Donald wrote:
Hmm - I am fairly sure I answered this question last time ...
I'm getting old ...
It is ****NOT**** done by the JVM but needs to be implemented by container vendors. Avalon/Phoenix implements it, as does TC4 as does most newer servlet (and ejb?) containers because it is part of their spec.
Look at they way that all the commons products now use it - even ant is following the spec now due to a recent contribution. Heres a basic reference
http://java.sun.com/j2se/1.3/docs/guide/extensions/versioning.html
Example dependency declaration
Extension-List: javahelp
javahelp-Extension-Name: javax.help javahelp-Specification-Version: 1.0 javahelp-Implementation-Version: 1.0.3 javahelp-Implementation-Vendor-Id: com.sun
No location dependent information there.
Thanks for the link. I guess I find the spec a little vague. For example, according to
http://java.sun.com/j2se/1.3/docs/guide/extensions/extensions.html
"Installed optional packages are JAR files in the directory
lib/ext [in the Java 2 Runtime Environment] jre/lib/ext [in the Java 2 SDK]"
The example you gave above is not completely valid, since when you use Extension-List it seems you must also supply the <extension>-Implementation-URL header - it is not indicated as optional. Seems a little location dependent :-) - Just kidding.
Anyway, I guess the container implementors are interpreting the spec somewhat liberally.
Conor
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