The error message "class file has wrong version 48.0, should be 47.0"
indicates that you're trying to run Java 1.4 code in a Java 1.3 JVM. I
know you said your dev server is running JDK 1.4.2_17 but apparently
that's not really the case.

I wasn't able to find an official list of class file version numbers
from Sun, but here are a couple of 3rd-party references:
http://www.rgagnon.com/javadetails/java-0544.html
http://en.wikipedia.org/wiki/Class_(file_format)
-- 
Len

On Tue, Apr 8, 2008 at 6:35 PM, Eric B <[EMAIL PROTECTED]> wrote:
> Hi, all.
>
>  I've got a problem that may be with one of three different components, but
>  the error message is appearing in Tomcat, so I'm posting it here. :-)
>
>  I've got two machines, one for Development, and one that acts as a
>  Development Server:
>
>  Dev:
>  Windows XP Pro
>  Ant 1.6.5
>  JDK 1.4.2_17 (Used for building application)
>  JDK 1.6.0_05 (Used for running Eclipse)
>  All environment variables set to use the 1.4.2 JDK
>
>  Server:
>  Windows 2000 Pro
>  JDK 1.4.2_17
>  Tomcat 4.1.30 (Runs as a service, using the "server" version of jvm.dll")
>  All environment variables set to use the 1.4.2 JDK
>
>  I can build my project on the Dev machine with no problems, but when I ship
>  the .war over to the Server and attempt to run it, I get the following
>  error:
>  An error occurred at line: 24 in the jsp file: /ivr/dialogs/get_dnis.jsp
>
>  Generated servlet error:
>  bad class file: C:\jdk142_17\jre\lib\rt.jar(java/lang/Object.class)
>  class file has wrong version 48.0, should be 47.0
>  Please remove or make sure it appears in the correct subdirectory of
>  the classpath.
>
>  Now, I've tried putting a target="1.4" entry into the <javac> tag in
>  my build file, but it's still happening.  Is there something wrong
>  with my Tomcat setup, or am I just completely clueless with Ant?
>
>  Thanks for the help!
>  Eric B
>

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