So back to the question: How do I write an installler to change
the default preference to 5.0 if its there for my end users, or
what files does the apple preference application change to make 5.0
prefered for applets and webstart please, that is what my question
is so that 5.0 is default after it's installed so that I can detect
it from my website?
You don't and shouldn't. Why not attempt to detect what they have
installed and then change what you request instead of changing a
default that is intended to be under the users control.
If you absolutely *must* do this (to get double-clicked JARs to
open in 1.5, for example) here are my thoughts:
- don't try and install 1.5 yourself, at most send the user's web
browser to Apple's download page
- consider opening the Java Preferences application, instructing
the user to make the necessary change (use Runtime.exec with a
String array of command line arguments containing "open" and
"/Applications/Utilities/Java/J2SE 5.0/Java Preferences.app",
note the usual caveats about Runtime.exec, argument parsing,
and using multiple threads to drain the output streams so it
cannot deadlock)
- if 1.5 is already present, but not being used, post a dialog
asking the user for permission to tweak the preferred JVM, and
if they say 'no', either quit cleanly or carry on with degraded
features (if you can do so cleanly)
- if and only if the user OKs it (and the file already exists),
go in and munge ~/Library/Caches/java/deployment.properties. It
looks like you need to change the index numbers in the
deployment.javaws.jre.#.* (where # is the index number, 0 is
the highest JRE), but I haven't tried it. Keep a backup copy of
the properties file, in case it hits the fan. Once munged, quit
and restart your application.
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