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From Pierre-Arnaud Marcelot>
Subject Re: ADS Studio: add new library: duplicate jar entry
Date Fri, 22 Feb 2013 10:39:28 GMT

On 22 févr. 2013, at 11:15, Francis ANDRE <> wrote:

> Hi Pierre-Arnaud
> Le 22/02/2013 10:50, Pierre-Arnaud Marcelot a écrit :
>> Hi Francis,
>> You shouldn't embed transitive dependencies when you create a "library plugin".
> Ok but it seems to work... when I remove manually the duplicate jar entry in the Eclipse
classpath and launch the studio,  classes from the lib jars are, is your statement
a formal and strong directive?

Yeah, it will work, indeed. But this isn't the way OSGI is supposed to work.

Before we moved to creating what I call "library plugins" we were using a dedicated Eclipse
plugin (it was called "jars") which role was to contain all our jar libraries, exported all
the classes from them and made them available to our plugins.

While it worked perfectly fine for Studio plugins, we received reports that other third party
plugins (installed in Eclipse by our users) were being buggy or completely non-functional.
This did not affect the RCP app which only used Eclipse and Apache Directory Studio plugins.
It was just a problem when users installed Apache Directory Studio in an Eclipse application
alongside other third party plugins.
It looked like our "jars" plugin was selected in the dependency resolution of some of those
third party plugin, and given that we were not using the same library version of them, they
would fail.

So, in version 2.0, we removed the "jars" plugin and replaced it by proper use of OSGI capabilities.
Hopefully for us, some of our dependencies were already OSGI bundle, so we could include them
as is.
For all other libraries, we had to repackage them into OSGI bundles (or Eclipse plugins),
hence the name I gave them "library plugins".

So, that's the story behind all that...

>> First of all, if the library is already an OSGI bundle, you don't need to create
one, just add it to the linked libraries from the custom Target Platform, this is in the 'repository'
>> If it's not an OSGI bundle, then you need to make it an OSGI by repackaging the jar
as a "library plugin", that's what you're currently doing.
>> But, as it becomes an OSGI bundle, it means all its dependencies must also be OSGI
bundle, so you need to convert them as well, one "library plugin" per dependency
> I have more than 25 jars as I would appreciate any other alternative
than building one "library plugin" per dependency if any...

I understand... I've gone that path (very difficult to maintain).
You could maybe try the all-in-one "jars" plugin, here's what it looked like in previous versions
of Apache Directory Studio:
But, keep in mind the limitations and possible issues it could bring depending on what environment
you'll be running your plugins.


>> Hope this helps,
>> Pierre-Arnaud
>> On 22 févr. 2013, at 10:14, Francis ANDRE <>
>>> Hi
>>> I am adding a new library to the ADS Studio by copy/paste an already existing
pom.xml like org.apache.commons.codec/pom.xml but the generated MANIFEST.MF contains a duplicate
entry even with the instruction: <_exportcontents>!lib,*</_exportcontents>. The
only difference with the new pom.xml is the <Embed-Transitive>true</Embed-Transitive>
>>> What do I miss for remonving the duplicate entry?
>>>        <configuration>
>>>          <manifestLocation>META-INF</manifestLocation>
>>>          <instructions>
>>> <Bundle-SymbolicName>${project.artifactId}</Bundle-SymbolicName>
>>> <Embed-Dependency>*;scope=compile|runtime</Embed-Dependency>
>>>            <Embed-Directory>lib</Embed-Directory>
>>>            <Embed-StripGroup>true</Embed-StripGroup>
>>>            <Embed-Transitive>true</Embed-Transitive>
>>>            <_exportcontents>!lib,*</_exportcontents>
>>>            <Import-Package>!</Import-Package>
>>>          </instructions>
>>>        </configuration>
>>> TIA

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