Tom Watson created FELIX-6525:
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Summary: org.apache.felix.http.servlet-api exports multiple
versions with no uses
Key: FELIX-6525
URL: https://issues.apache.org/jira/browse/FELIX-6525
Project: Felix
Issue Type: Improvement
Components: HTTP Service
Affects Versions: http.servlet-api-1.2.0
Reporter: Tom Watson
Here is the Export-Package for the bundle
{quote}
Export-Package:
javax.servlet;version="2.6";uses:="javax.servlet.annotation,javax.servlet.descriptor",
javax.servlet.annotation;version="2.6";uses:="javax.servlet",javax.servlet.descriptor;version="2.6",
javax.servlet.http;version="2.6";uses:="javax.servlet",
javax.servlet;version="3.0",
javax.servlet.annotation;version="3.0",
javax.servlet.descriptor;version="3.0",
javax.servlet.http;version="3.0",
javax.servlet;version="3.1",
javax.servlet.annotation;version="3.1",
javax.servlet.descriptor;version="3.1",
javax.servlet.http;version="3.1",
javax.servlet;version="4.0",
javax.servlet.annotation;version="4.0",
javax.servlet.descriptor;version="4.0",
javax.servlet.http;version="4.0"{quote}
Only the lowest version of the packages is exported with the `uses` directive.
I believe this will cause some very difficult to debug resolution issues. Each
export becomes a distinct capability to the resolver. Bundles wiring to the
2.6 versions will be constrained by the used packages while bundles that can
wiring to the higher versions will not be constrained.
This becomes even more prevalent if a bundle uses the recommended way to
consume these osgi.contract bundles. There they would import the packages
without any specified version, but then also put a requirement on the
osgi.contract for JavaServlet at a specific version. This contract is also
provided by this servlet-api bundle with the proper uses constraints. But now
that leaves the resolver with the option to choose any versions exported by
this bundle. Most likely the framework ResolveContext is going to start with
the highest version available. And that package will have no uses contraints.
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