class file has wrong version 49.0, should be 48.0

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Michael - 13 Jan 2006 14:53 GMT

Hi I am having great problems getting DrJava to run on my machine any ideas
this is the error I keep getting,
any help to resolve this would be greatly appreciated

Michael.

1 error found:
File: C:\Documents and Settings\Michael\Desktop\java
samples\11\demo1\Application1.java [line: 2]
Error: cannot access java.lang.Object
bad class file: C:\Program
Files\Java\jre1.5.0_04\lib\rt.jar(java/lang/Object.class)
class file has wrong version 49.0, should be 48.0
Please remove or make sure it appears in the correct subdirectory of the
classpath.

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Fabien Bergeret - 13 Jan 2006 15:45 GMT

> Hi I am having great problems getting DrJava to run on my machine any ideas
> this is the error I keep getting,
[quoted text clipped - 11 lines]
> Please remove or make sure it appears in the correct subdirectory of the
> classpath.

You compile with a java 1.5, and you execute with a java 1.4
To make sure : type java -version in a terminal
If the asumption is true, then you'll have to change your PATH varible
to reference the right jre

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Michael - 13 Jan 2006 16:57 GMT

Thanks for that, after looking into it your right, but how can i change the
settings?

unfortunitly i have just about had enough of java and uni for this week!
i just hate not getting something to work, i bet its so simple too.
Thanks
Michael

>> Hi I am having great problems getting DrJava to run on my machine any
>> ideas this is the error I keep getting,
[quoted text clipped - 16 lines]
> If the asumption is true, then you'll have to change your PATH varible to
> reference the right jre

Reply to this Message

Fabien Bergeret - 16 Jan 2006 08:49 GMT

> Thanks for that, after looking into it your right, but how can i change the
> settings?
[quoted text clipped - 24 lines]
>>If the asumption is true, then you'll have to change your PATH varible to
>>reference the right jre

Obviously, you're using Windows. So here is the procedure (on Windows
200) (menu labels are translated from French to English, and maybe not
exactely the same).
Start->Paramters->Configuration Panel->System->Advanced->Environment
variables
Find PATH, select it, modify button, insert the path to the 1.5 java.exe
at the beginning of the line (; as a separator), OK, OK.
Start a new cmd, and try java -version. Version should now be 1.5

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Roedy Green - 13 Jan 2006 20:15 GMT

On Fri, 13 Jan 2006 14:53:38 GMT, "Michael"
<mhiggins@REMOVEMEblueyonder.co.uk> wrote, quoted or indirectly quoted
someone who said :

>Files\Java\jre1.5.0_04\lib\rt.jar(java/lang/Object.class)
>class file has wrong version 49.0, should be 48.0

Try uninstalling all your JDKS and JREs and installing the latest one
1.5.0_06.

See http://mindprod.com/jgloss/jdk.html

It sounds like pieces from two different JDKS are getting muddled
together.

Signature

Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.

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class file has wrong version 49.0, should be 48.0

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