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There are API differences between WebObjects 5.3 and WebObjects 5.4 that one may need to deal with when changing code in Project WOnder frameworks.
There is a document from Apple which tells you how to identify the WebObjects version you are using. It is at: http://support.apple.com/kb/TA26706
The meat of it is that you can look in the /System/Library/Frameworks/JavaWebObjects.framework/Resources/version.plist file on your system and see something like:
The CFBundleShortVersionString tells you that this is a WebObjects 5.4.3 installation.
You can also look at the first line of the console log of any of your applications. You will see a line like: