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From Brian Fox <>
Subject Re: annotations support in compiler mojo
Date Wed, 10 Feb 2010 14:52:42 GMT
Does it make sense to create a plugin specifically for annotation processing?

On Sat, Jan 30, 2010 at 3:06 AM, Milos Kleint <> wrote:
> can I read silence as lazy consensus to add annotation processing to the
> compiler plugin?
> Milos
> On Mon, Jan 25, 2010 at 2:48 PM, Milos Kleint <> wrote:
>> Hello,
>> I'd like to start a discussion about how annotations are supported in maven
>> builds. I'm currently trying to use some NetBeans Platform based annotations
>> in maven projects and I'm encountering some problems.
>> 1. - -sourcepath needs to be
>> always set to have the annotations processed. fixed in latest plexus
>> compiler sources..
>> 2. some annotation processors require resources to be present on the
>> sourcepath eg. one that generates java beans from schema or another one that
>> checks for property bundle key presence. I'm not sure how to make this
>> generally available to the processor. resources themselves (in
>> src/main/resources) are not to be referenced I guess (as they could be on
>> wrong <targetPath> or not filtered). So the only other option is to include
>> the target/classes folder somehow with the correctly processed resources.
>> Any other idea?
>> 3. Some annotation processors generate xml files or META-INF/services
>> content, some generate java files. the default output location for the
>> processor is target/classes, which is fine for xml files, but it's
>> inconvenient to generate java files there as they end up in the jar file
>> then. I've tried to configure the compiler to use
>> target/generated-sources/annotations as the output folder for sources (via
>> -s <dir> switch). Unfortunately there are problems associated with that
>> approach.
>>    a. the folder needs to exist up front or the compiler chokes on it.
>> Doable with some ant-run scripting, but ugly.
>>    b. what to do with the resources there that need to be copied to the
>> target/classes folder? Doable with resources:copy-resources but again ugly.
>> 4. reporting from the annotations processors is broken -
>> Issue seems to be dedicated
>> to annotation support. Is anyone actively working on it? I'm volunteering to
>> add some of the required switches as prameters for the compiler mojo, but
>> I'm unsure how to proceed. Is it ok just to add the required stuff as mojo
>> params, even if it will be unused by some of the other compilers? and even
>> by the non 1.6 javac compilers? or have some new ways fo configuring the
>> mojo (as pointed out in
>> Thanks for any comments.
>> Milos
>> PS: I can provide a sample project with the above mentioned annotations
>> being used if there is interest.

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