Re: Java 6 Mac

Nigel Wade <>
Mon, 12 Nov 2007 16:04:30 +0000
Andrew Thompson wrote:

On Nov 8, 2:17 am, Nigel Wade <> wrote:

Andrew Thompson wrote:

Nigel Wade wrote:

... This
will ensure that your code is treated as 1.5 by the IDE editor, and an


-target 1.5 is added to the compilation so the bytecode can be run by a 1.5

That is not enough to ensure the bytecodes will run on
a Java 1.5 VM.

Ok, if you want to be explicit I expect it also adds the -bootclasspath ...

Really? I am surprised to hear that, since that
option inherently requires an rt.jar from the target
version, and I had not realised netbeans supplied
a suitable jar for any earlier Java version.

Well, I was assuming that NetBeans does what is required based on what the
documentation for javac says, in that -bootclasspath and -extdirs are required.
Of course, as you point out it can only do this if it happens to know the
location of the installation of the alternate JRE/SDK version, which might not
even be installed...

So, my assumption was most likely wrong, and NetBeans only adds -target to the
javac if you use the "Source Level:" option in the project settings. This is
one reason why using an IDE is a problem, as all these details are hidden from
you and you can only guess what the IDE is really doing.

However, I've not had any compatibility problems using this option in a 1.6
development environment to generate code to run in a 1.5 production
environment. Of course I might just have been lucky so far.

What value does it insert for (random example)
Java 1.3?

Who knows?

Nigel Wade, System Administrator, Space Plasma Physics Group,
            University of Leicester, Leicester, LE1 7RH, UK
E-mail :
Phone : +44 (0)116 2523548, Fax : +44 (0)116 2523555

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