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Re: [cross-project-issues-dev] Mars M3: Wiring problems with HttpClient/Core 4.2.x and 4.3.x both present
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Hi Andreas,
Cheers Alexander Hi,
we at Eclipse Code Recommenders recently got a bug report [1] about a bundle resolution failure in Mars M3.
Apparently, the fact that Mars M3 ships Apache HttpClient/Core 4.3.x rather than 4.2.x causes Eclipse Aether (which Code Recommenders uses internally) to not resolve properly:
org.osgi.service.resolver.ResolutionException: Uses constraint violation. Unable to resolve resource org.eclipse.aether.transport.http [osgi.identity; osgi.identity="org.eclipse.aether.transport.http"; type="osgi.bundle"; version:Version="1.0.0.v20140518"] because it is exposed to package 'org.apache.http.entity' from resources org.apache.httpcomponents.httpcore [osgi.identity; osgi.identity="org.apache.httpcomponents.httpcore"; type="osgi.bundle"; version:Version="4.2.5.v201311072007"] and org.apache.httpcomponents.httpcore [osgi.identity; osgi.identity="org.apache.httpcomponents.httpcore"; type="osgi.bundle"; version:Version="4.3.2.v201409180530"] via two dependency chains.
Chain 1: org.eclipse.aether.transport.http [osgi.identity; osgi.identity="org.eclipse.aether.transport.http"; type="osgi.bundle"; version:Version="1.0.0.v20140518"] import: (&(osgi.wiring.package=org.apache.http.entity)(&(version>=4.2.1)(!(version>=4.3.0)))) | export: osgi.wiring.package: org.apache.http.entity org.apache.httpcomponents.httpcore [osgi.identity; osgi.identity="org.apache.httpcomponents.httpcore"; type="osgi.bundle"; version:Version="4.2.5.v201311072007"]
Chain 2: org.eclipse.aether.transport.http [osgi.identity; osgi.identity="org.eclipse.aether.transport.http"; type="osgi.bundle"; version:Version="1.0.0.v20140518"] import: (&(osgi.wiring.package=org.apache.http.conn.ssl)(&(version>=4.2.1)(!(version>=4.3.0)))) | export: osgi.wiring.package=org.apache.http.conn.ssl; uses:=org.apache.http.entity org.apache.httpcomponents.httpclient [osgi.identity; osgi.identity="org.apache.httpcomponents.httpclient"; type="osgi.bundle"; version:Version="4.2.6.v201311072007"] import: (&(osgi.wiring.package=org.apache.http.entity)(version>=4.2.5)) | export: osgi.wiring.package: org.apache.http.entity org.apache.httpcomponents.httpcore [osgi.identity; osgi.identity="org.apache.httpcomponents.httpcore"; type="osgi.bundle"; version:Version="4.3.2.v201409180530"]
This wiring problem may affect other projects beyond Eclipse Aether as well (hence the cross-post to cross-project-issues), if they import a specific *minor* version of Apache HttpClient/Core (Aether requires 4.2.x).
What I don't quite understand is why the bundles are wired as they are, though, as a solution to the uses constraint problem seems to exist: Wire org.apache.httpcomponents.httpclient 4.2.6 to org.apache.httpcomponents.httpcore 4.2.5 rather than 4.3.2. Is it because of the open-ended Import-Package of [4.2.5,) in org.apache.httpcomponents.httpclient 4.2.6? (FWIW, 4.3.2 doesn't use open-ended Import-Packages anymore. :-)
Any advice in how to best proceed with this issue? Should org.eclipse.aether.transport.http use a broader Import-Package range including 4.3.x (provided that there were no breaking API changes between 4.2.x and 4.3.x)?
Best wishes,
Andreas
[1] <https://bugs.eclipse.org/bugs/show_bug.cgi?id=450738>
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