Without Java 1.5 installed, Java Web Start.app handles the JNLP, so
you get either a 1.3.1 or 1.4.2 VM depending what the JNLP says. If
it says 1.5* I assume you get a "no can do".
Right. You'll get an alert saying the specified VM was not available.
With Java 1.5 installed, Java Cache Viewer.app handles JNLPs, and
what you get depends on Java Preferences.app.
- JNLP 1.4* ignores Java Preferences so gives you 1.4.2.
- JNLP 1.4+ and 1.4.2 preferred in Java Preferences gives you 1.4.2.
- JNLP 1.4+ and 1.5 preferred in Java Preferences gives you 1.5.
- JNLP 1.5* ignores Java Preferences so gives you 1.5.
- JNLP 1.5+ and 1.4.2 preferred in Java Preferences gives you 1.5.
- JNLP 1.5+ and 1.5 preferred in Java Preferences gives you 1.5.
Is this correct? If so, I find this very unintuitive.
You're correct on all counts, but I wouldn't characterize the '1.4*'
behavior as ignoring Java Preferences. The JNLP spec says that this
means you'll only take any 1.4 VM that's available, and that's what
we're doing.
For 1.4+ and 1.5+, I agree with you that it is not intuitive, but it
was done for compatibility's sake. If an application that worked
correctly with 1.4.2 started using 1.5.0 and then had problems, we
would have a lot of unhappy users. This is a bigger problem with
bundled applications that used the plus notation, but it is
admittedly easier to correct in JNLP.
Think of the VM ordering as a JVM search path. In prior releases of
Java 5, we attempted to 'pick the first VM that matches' starting
with 1.4.2, then 1.5.0, then 1.3.1. If you drag 1.5.0 to the top of
the list, the search order is 1.5.0, then 1.4.2, then 1.3.1.
In Java 5 release 4, the default matching order is 1.5.0 -> 1.4.2 ->
1.3.1, which is what you would expect.
-- Out of the Tiger box, javaws is a symlink to /Applications/
Utilities/Java/Java Web Start.app/Contents/MacOS/Java WebStart.
When you installed a release of Java 5.0, the symlink is
overwritten to point to /Applications/Utilities/Java/J2SE 5.0/Java
Cache Viewer.app/Contents/MacOS/Java Cache Viewer.
This isn't true on my Mac at work nor my PowerBook at home. This
might be the source of my initial confusion.
Steves-TiPB:~ steve$ ls -l `which javaws`
lrwxr-xr-x 1 root wheel 77 Sep 23 09:25 /usr/bin/javaws -> /
Applications/Utilities/Java/Java Web Start.app/Contents/MacOS/Java
Web Start
I was actually incorrect with this last statement. In Java 5 Rel 4 it
should be
which symlinks to the right version-specific link. That was changed
in Java 5 release 3 -- Which release of Java 5 do you have installed?
Scott
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