A similar problem has been reported in several places when trying to use
JDK 1.4 with JBuilder, only this time its "wrong version 48.0".
Try installing the latest upgrades and patches:

http://www.borland.com/devsupport/jbuilder/


hojohojo@... wrote:
>
> --- In jsci@y..., Mark Hale <mark.hale@p...> wrote:
>
> > I guess JBuilder must come with its own JVM.
>
> I'm using JBuilder4 professional. Help -> About -> Info tells me:
> java.vm.Info | mixed mode
> java.vm.Name | Java HotSpot(TM) Client VM
> java.vm.vendor | Sun Microsystems Inc.
> java.vm.version | 1.3.0-C
> java.class.version | 47.0
>
> I have the same problem with the
> "class file has wrong version 47.0".
>
> I also loaded the jdk 1.3.1_01 today and set JBuilder to use it,
> doesn't help (I'm pretty sure I managed to make JBuilder to use this
> newly loaded version, since I removed JBuilder's own java and jawac).
>
> GraphDemo compiles nicely on command line.
>
> What are the main differences between the version for JDK 1.1.8 and
> for the JDK 1.3? How big differences there are in execution speed? Is
> there something relevant missing from the v.1.1.8? I'll use that if
> it works better.
>
> Life is mysterious,
> Perttu
>
>
>
>
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