Reverting to 1.4.2 without uninstalling 1.5.0

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Wendy S - 02 Mar 2004 21:41 GMT

I just installed 1.5.0 beta, but for the moment I need to continue working
with 1.4.2 on Windows 2000.

(Why is there no javac -version option??) I've left JAVA_HOME set to
c:\j2sdk1.4.2_03, and Cygwin reports:
$ which javac
/cygdrive/c/j2sdk1.4.2_03/bin/javac

So I'm pretty sure I'm compiling with 1.4.2. However, java -version reports
1.5.0-beta, even though JAVA_HOME is as above and my PATH includes
%JAVA_HOME%/bin.

Confused, I checked:
$ which java
/cygdrive/c/WINNT/system32/java

I always assumed I was using one of the java.exe files in 'bin' or 'jre/bin'
under the Java install, but apparently there has always been this *third*
copy of java.exe that I was really using. And now that I think about it,
I'm pretty sure Roedy has a rant about this very thing in the Java Glossary
somewhere, but I couldn't find it.

I renamed the java.exe, javaw.exe and javaws.exe that I found in
c:\winnt\system32, and now Cygwin reports:
$ which java
/cygdrive/c/j2sdk1.4.2_03/bin/java

Better! So I'll post this in case someone else has the same problem. Or so
I can find it again when I install a new version of Java and the same thing
happens.

-Wendy S

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Thomas Schodt - 02 Mar 2004 22:37 GMT

> I just installed 1.5.0 beta, but for the moment I need to continue working
> with 1.4.2 on Windows 2000.
>
> (Why is there no javac -version option??)

You can use javah -version

Reply to this Message

Andrew Thompson - 02 Mar 2004 23:00 GMT

> I just installed 1.5.0 beta, but for the moment I need to continue working
> with 1.4.2 on Windows 2000.
[quoted text clipped - 5 lines]
>
> So I'm pretty sure I'm compiling with 1.4.2.

IIUC Wendy, you need the -target and
-bootclasspath options of javac.

The -target option ensures the bytecodes
are compatible with that VM version, you
need to use -bootclasspath as well to ensure
you are not using any classes that are not
contained in that Java rt.jar

I use both options with my on-line compiler
<http://www.physci.org/javac.jsp?bcp=MS>

You will not be able to compile antything
with a color.WHITE in this mode, try it
with the CardLayout source to see.

Signature

Andrew Thompson
* http://www.PhySci.org/ Open-source software suite
* http://www.PhySci.org/codes/ Web & IT Help
* http://www.1point1C.org/ Science & Technology

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Wendy S - 02 Mar 2004 23:25 GMT

> IIUC Wendy, you need the -target and
> -bootclasspath options of javac

Interesting... I compile with Ant, so:

<javac srcdir="${srcdir}\dev" destdir="${destdir}"
deprecation="on" debug="on" target="1.4.2">
<classpath refid="project.classpath"/>
</javac>

> The -target option ensures the bytecodes
> are compatible with that VM version, you
[quoted text clipped - 8 lines]
> with a color.WHITE in this mode, try it
> with the CardLayout source to see.

Reply to this Message

Wendy S - 02 Mar 2004 23:35 GMT

> <javac srcdir="${srcdir}\dev" destdir="${destdir}"
> deprecation="on" debug="on" target="1.4.2">
> <classpath refid="project.classpath"/>
> </javac>

I'm having trouble finding examples with Google. Do I put 1.4.2 for target
or is just 1.4 sufficient?

And for bootclasspath, missing in the code above, the examples I found have
'classes.zip' but for 1.4 is that supposed to be 'rt.jar' (including the
path)?

Signature

Wendy S

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Reverting to 1.4.2 without uninstalling 1.5.0

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