On Sun, May 3, 2009 at 3:31 AM, Richard S. Hall <he...@ungoverned.org> wrote: > [..] > Please try out some fragments and give feedback. > > I will likely need to push a release of this soon, since GF has some > requirements I need to address with it. So any feedback is welcome.
Hi Richard, I did a fair amount of testing on bundle fragment support yesterday and today, using both some home-made fragments and examples available. As Clement says, felix works fine with slf4j, but fails to resolve some "real world" fragments. Taking the usual hibernate bundle as an example, the 2 fragments are not resolved [ 7] [Active ] [ 1] JBoss Hibernate Object-Relational Mapper (3.2.6.ga) [ 9] [Installed ] [ 1] JBoss Hibernate Annotations (3.3.1.ga) [ 10] [Active ] [ 1] JBoss Hibernate Common Annotations (3.3.0.ga) [ 11] [Installed ] [ 1] JBoss Hibernate Entity Manager (3.3.2.GA) The reason is DEBUG: Excluding fragment com.springsource.org.hibernate.annotations from com.springsource.org.hibernate due to conflict with imported package org.apache.commons.logging from com.springsource.org.hibernate DEBUG: Excluding fragment com.springsource.org.hibernate.ejb from com.springsource.org.hibernate due to conflict with imported package javax.naming from com.springsource.org.hibernate In practice, when host and fragment share some imports (in the specific org.apache.commons.logging and javax.naming), fragments are not resolved. Specification wise, I think these double imports should be specified, since "Fragments are therefore treated as part of the host, including any permitted headers; they must not have their own class loader. " and " Append the import definitions for the Fragment bundle that do not con- flict with an import definition of the host to the import definitions of the host bundle. A Fragment can provide an import statement for a private package of the host. The private package in the host is hidden in that case. [..] A host and a fragment conflict when they cannot resolve to provide a consis- tent class space" but, as far as I see, it's quite common to find similar cases in already available bundles. -- Filippo Diotalevi
