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From David Jencks <>
Subject Re: javadoc @version tags
Date Wed, 09 Sep 2009 22:31:49 GMT

On Sep 9, 2009, at 1:14 PM, Alan D. Cabrera wrote:

> On Sep 9, 2009, at 11:01 AM, David Jencks wrote:
>> I was looking at the generated xbean site prior to releasing and  
>> noticed the version looks pretty messy with lots of random  
>> variations.  I think we've previously encouraged something like this:
>>  * @version $Rev:$ $Date:$
>> which expands to something like
>>  * @version $Rev: 437551 $ $Date: 2006-08-27 23:14:47 -0700 (Sun,  
>> 27 Aug 2006) $
>> which ends up in javadoc as something like
>> Version:
>> $Rev$ $Date$
>> or
>> Version:
>> $Rev: 437551 $ $Date: 2006-08-27 23:14:47 -0700 (Sun, 27 Aug 2006) $
>> This seems wrong to me.  I think in javadoc the version ought to be  
>> something like 3.6-SNAPSHOT or 3.6.
>> So, I'd like to propose that:
>> 1. we investigate and find out if there's a way to set the javadoc  
>> version to the maven version.  If so, use it.  If not, remove the  
>> @version.
>> 2. Decide if we want the svn keyword info in the java files at all,  
>> and if so get it out from the @version javadoc tag.
> What do other projects do?  It's always been my understanding that  
> the @version relates to the version of the code file and not the  
> release.

So far the documentation I've found (

@version) says:

The Java Software convention for the argument to the @version tag is  
the SCCS string "%I%, %G%", which converts to something like "1.39,  
02/28/97" (mm/dd/yy) when the file is checked out of SCCS.

Also ( 

@version  version-text
Adds a "Version" subheading with the specified version-text to the  
generated docs when the -version option is used. This tag is intended  
to hold the current version number of the software that this code is  
part of (as opposed to @since, which holds the version number where  
this code was introduced). The version-text has no special internal  
structure. To see where the version tag can be used, see Where Tags  
Can Be Used.
A doc comment may contain multiple @version tags. If it makes sense,  
you can specify one version number per @version tag or multiple  
version numbers per tag. In the former case, the Javadoc tool inserts  
a comma (,) and space between names. In the latter case, the entire  
text is simply copied to the generated document without being parsed.  
Therefore, you can use multiple names per line if you want a localized  
name separator other than comma.

While the meaning of "1.39" is not clear, it might be a cvs version  
number, which is sort of analogous to an svn revision number.  On the  
other hand, the second snippet indicates that it is analogous to the  
@since tag and that the versions specified in both should be  
comparable: this would agree with the idea that the maven version  
number is more appropriate.

david jencks

> Regards,
> Alan

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