OSGI Bundle Uses Conflict, Possible Supplier?

[eric_gulatee]

All,

My bundle is importing org.springframework.web.context.support for use
which can be found in bundle:
org.springframework.web_2.5.5.A.jar supplied by spring-dm server.

However I get the following error

[2008-10-17 16:33:22.866] fs-watcher <SPDE0018E> Unable to install application from location 'file:/C:/development/springsource-dm-serve
r-1.0.0.RELEASE/pickup/da-web-all-0.0.2-SNAPSHOT.jar'. Could not satisfy constraints for bundle 'com.da.da-web-all' at version '0.0.2.SNAPSHOT'.
Cannot resolve: com.da.da-web-all
Resolver report:
Bundle: com.da.da-web-all_0.0.2.SNAPSHOT - Uses Conflict: Import-Package: org.springframework.web.context.support; version="2.5.5.A"
Possible Supplier: org.springframework.web_2.5.5.A - Export-Package: org.springframework.web.context.support; version="2.5.5.A"
Possible Conflicts: org.springframework.beans.factory.support,javax.se rvlet,org.springframework.ui.context,org.springfra mework.core.io,org.spr
ingframework.beans,org.springframework.context,org .springframework.beans.factory.xml,org.springframe work.core.io.support,org.springframework.beans.fac
tory.config,org.springframework.web.context,javax. servlet.http
.
Once I did the work to remove that feature since I figured, I wanted to get the web bundle deployed asap.

I ran into:


[2008-10-17 17:20:20.403] fs-watcher <SPDE0018E> Unable to install application from location 'file:/C:/development/springsource-dm-serve
r-1.0.0.RELEASE/pickup/da-web-all-0.0.2-SNAPSHOT.jar'. Could not satisfy constraints for bundle 'com.da.da-web-all' at version '0.0.2.SNAPSHOT'.
Cannot resolve: com.da.da-web-all
Resolver report:
Bundle: com.da.da-web-all_0.0.2.SNAPSHOT - Uses Conflict: Import-Package: org.exolab.castor.xml; version="1.1.2"
Possible Supplier: com.springsource.org.castor_1.1.2 - Export-Package: org.exolab.castor.xml; version="1.1.2"
Possible Conflicts: org.exolab.castor.mapping.xml,org.exolab.castor.ut il,org.castor.mapping,org.exolab.castor.mapping,or g.exolab.castor.xml.lo
cation,org.xml.sax.helpers,org.w3c.dom,org.xml.sax ,org.exolab.castor.mapping.loader

Any ideas? Why is it detecting conflicts? Anything I can do about it?
The package and the version match...

[Andy Wilkinson]

[2008-10-17 16:33:22.866] fs-watcher <SPDE0018E> Unable to install application from location 'file:/C:/development/springsource-dm-serve
r-1.0.0.RELEASE/pickup/da-web-all-0.0.2-SNAPSHOT.jar'. Could not satisfy constraints for bundle 'com.da.da-web-all' at version '0.0.2.SNAPSHOT'.
Cannot resolve: com.da.da-web-all
Resolver report:
Bundle: com.da.da-web-all_0.0.2.SNAPSHOT - Uses Conflict: Import-Package: org.springframework.web.context.support; version="2.5.5.A"
Possible Supplier: org.springframework.web_2.5.5.A - Export-Package: org.springframework.web.context.support; version="2.5.5.A"
Possible Conflicts: org.springframework.beans.factory.support,javax.se rvlet,org.springframework.ui.context,org.springfra mework.core.io,org.spr
ingframework.beans,org.springframework.context,org .springframework.beans.factory.xml,org.springframe work.core.io.support,org.springframework.beans.fac
tory.config,org.springframework.web.context,javax. servlet.http

This error indicates that the bundle com.da.da-web-all cannot import the package org.springframework.web.context.support because the com.da.da-web-all bundle imports a different version of one of the packages that is used by the org.springframework.web.context.support package. The list of possible conflicts details all of the packages which are used by the org.springframework.web.context.support package. It is one of these packages which will be in conflict.

[2008-10-17 17:20:20.403] fs-watcher <SPDE0018E> Unable to install application from location 'file:/C:/development/springsource-dm-serve
r-1.0.0.RELEASE/pickup/da-web-all-0.0.2-SNAPSHOT.jar'. Could not satisfy constraints for bundle 'com.da.da-web-all' at version '0.0.2.SNAPSHOT'.
Cannot resolve: com.da.da-web-all
Resolver report:
Bundle: com.da.da-web-all_0.0.2.SNAPSHOT - Uses Conflict: Import-Package: org.exolab.castor.xml; version="1.1.2"
Possible Supplier: com.springsource.org.castor_1.1.2 - Export-Package: org.exolab.castor.xml; version="1.1.2"
Possible Conflicts: org.exolab.castor.mapping.xml,org.exolab.castor.ut il,org.castor.mapping,org.exolab.castor.mapping,or g.exolab.castor.xml.lo
cation,org.xml.sax.helpers,org.w3c.dom,org.xml.sax ,org.exolab.castor.mapping.loader

This error indicates that the bundle com.da.da-web-all cannot import the package org.exolab.castor.xml because the com.da.da-web-all bundle imports a different version of one of the packages that is used by the org.exolab.castor.xml package. The list of possible conflicts details all of the packages which are used by the org.exolab.castor.xml package. It is one of these packages which will be in conflict.

The easiest way to get to the bottom of a uses conflict is to use the Equinox console (telnet port 2401) to determine which of the possible conflicts is the actual offender. You're looking for a package in the list of possible conflicts that is imported by both of the bundles involved but at different versions. In the first case it's the com.da.da-web-all and org.springframework.web bundles in which you're interested. In the second case it's the com.da.da-web-all and com.springsource.org.castor bundles. The bundle and packages command will probably be of the most use to you.

[Glyn Normington]

Since diagnosing "uses" conflicts is likely to be a recurring theme for users of dm Server, I posted a blog which attempts to provide the necessary background.

[eric_gulatee]

Thanks to both for the detailed explanation and blog entry.

Much appreciate & very useful.