Please open a bug and indicate, which version of WTP you are trying to patch, 
as well as the patch itself.

On 2011-03-16, at 9:04 AM, Patric Rufflar wrote:

> Unfortunately, this did not change anything. There are still no error 
> messages:
> 
> C:\IDE\eclipse>eclipsec -consoleLog -application 
> org.eclipse.equinox.p2.director
> -installIU org.eclipse.jst.jsp.core.derivepatch.feature.group -repository 
> file:
> ///c:/IDE/repo
> Installing org.eclipse.jst.jsp.core.derivepatch.feature.group 1.0.0.
> Operation completed in 11218 ms.
> 
> Of course, there are also no updated jar in the plugins directory and no 
> updated plugin version in the "Installation details" dialog.
> 
> 
> Quoting Pascal Rapicault <[email protected]>:
> 
>> Short answer: the entity to install is 
>> org.eclipse.jst.jsp.core.derivepatch.feature.group.
>> The IU org.eclipse.jst.jsp.core.derivepatch.feature.jar only deliver the 
>> feature.jar
>> 
>> On 2011-03-16, at 6:57 AM, Patric Rufflar wrote:
>> 
>>> Hello Pascal,
>>> 
>>> the p2 director installs the patch feature without any errors,
>>> but also ignores the contained patched plugin:
>>> 
>>> ...
>>> Starting application: 13547
>>> Installing org.eclipse.jst.jsp.core.derivepatch.feature.jar 1.0.0.
>>> Operation completed in 11797 ms.
>>> 
>>> So the director's behavior seems to be the same like the eclipse installer 
>>> does,
>>> unfortunately without any hints why the plugin is not installed.
>>> 
>>> I try to outline shortly what I did to create the patch feature:
>>> 
>>> 1. In the PDE perspective, I right-clicked on the WTP plugin 
>>> org.eclipse.jst.jsp.core and choose "import as->source project".
>>> 2. Within this project I fixed the bug, debugged and verified my fix.
>>> 3. I created a feature patch project: org.eclipse.jst.jsp.core.derivepatch
>>> In the creation wizard I specified the original feature which contains the 
>>> plugin we are going to patch:
>>> org.eclipse.jst.enterprise_ui.feature
>>> 4. In the "Plug-ins" tab of the feature.xml dialog, I added the patched 
>>> plugin, org.eclipse.jst.jsp.core.
>>> 5. I exported the feature patch project using Export... and then selecting 
>>> the "Deployable features" option.
>>> 
>>> Did I miss something?
>>> 
>>> 
>>> And some additional questions:
>>> - Why is the installable unit called 
>>> "org.eclipse.jst.jsp.core.derivepatch.feature.jar" while my patch feature 
>>> id is
>>> "org.eclipse.jst.jsp.core.derivepatch"?
>>> - is a patch feature an installable unit? If not what's the relation 
>>> between a IU and a feature?
>>> 
>>> 
>>> Thank you and best regards,
>>> Patric
>>> 
>>> Quoting Pascal Rapicault <[email protected]>:
>>> 
>>>> Patch is definitely the right construct to use since you just can't change 
>>>> everything in the dependency hierarchy chain (consumers of wst).
>>>> The best way to debug this is to actually use the p2 director app to 
>>>> install your patch:
>>>>    eclipse -application org.eclipse.equinox.p2.director -installIU MyPatch 
>>>> -repository ....
>>>> This will provide you a detailed explanation message as to why it can not 
>>>> be happening. You are not getting the same error message because the p2 UI 
>>>> does not "force" the install of a patch in the exact same way the director 
>>>> app does.
>>>> 
>>>> There are several possibilities as to why the patch does not apply
>>>> - The plugin is included by another feature
>>>> - Some dependency ranges are preventing your patched version of the plugin 
>>>> to install
>>>> - The patch does not patch the right version of the feature (the patch 
>>>> cerated in the UI needs to match the specific version (to the qualifier) 
>>>> of the feature, note that you can also tweak the metadata by hand to 
>>>> support ranges in there)
>>>> 
>>>> One final thing, when it comes to put this in production, know that a 
>>>> patch can actually be included in another feature making its installation 
>>>> transparent.
>>>> 
>>>> And, don't forget to open a bug against WTP to attach your change.
>>>> 
>>>> 
>>>> On 2011-03-15, at 8:56 AM, Patric Rufflar wrote:
>>>> 
>>>>> Hello everyone,
>>>>> 
>>>>> I'd like to fix a bug in an official eclipse plugin 
>>>>> (org.eclipse.jsdt.jsp.core, part of the WTP).
>>>>> I locally changed the source code and debugged it - everything works fine.
>>>>> 
>>>>> Now I'd like to propagate this change to my eclipse installation, but I 
>>>>> am facing problems.
>>>>> 
>>>>> To achieve this I created and installed a feature patch.
>>>>> 
>>>>> The feature patch has been installed successfully but -unfortunately - 
>>>>> not the included patched plugin.
>>>>> The original/unpatched version of the plugin is still installed and 
>>>>> active according to the "Eclipse Installation Details".
>>>>> When looking at the plugins folder I cannot see the jar of the patched 
>>>>> plugin.
>>>>> 
>>>>> I'd like to know:
>>>>> - Why? what I am doing wrong?
>>>>> - Does this something have to do with signing of the official plugins?
>>>>> - Is there a log to see why the patched plugin has not been installed?
>>>>> - Is a feature patch the best way to locally modify an official eclipse 
>>>>> plugin/feature?
>>>>> 
>>>>> I really appreciate your help.
>>>>> 
>>>>> Thank you and best regards,
>>>>> Patric
>>>>> 
>>>>> 
>>>>> _______________________________________________
>>>>> p2-dev mailing list
>>>>> [email protected]
>>>>> https://dev.eclipse.org/mailman/listinfo/p2-dev
>>>> 
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>>> 
>>> 
>>> 
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