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[equinox-dev] Uses constraint violation: -clean doesn't find solution even though it exists

Hi,

I am currently investigating a nasty uses conflict (Bug 513809 [1]) that
causes severe problems in several Oxygen M6 EPP packages (at least Java
and JEE) and I could really need some help from an OSGi expert.

First, the wiring problem in question *does* have a solution, but -clean
doesn't find it. Is this an Equinox bug or simply a known limitation,
given the NP completeness of bundle resolution?

Second, some of the Import-Packages' version ranges look either overly
specific [4.2.1,4.4) or overly broad [4.3.3,), so I wonder *if* this
problem could be prevented by fixing those Import-Packages (under the
assumption that all bundles in question adhere to semantic versioning).

Anyway, here's the uses conflict I was talking about:

> Chain 1:
>   org.eclipse.aether.transport.http [osgi.identity; type="osgi.bundle"; version:Version="1.0.1.v20141111"; osgi.identity="org.eclipse.aether.transport.http"]
>     import: (&(osgi.wiring.package=org.apache.http)(&(version>=4.2.1)(!(version>=4.4.0))))
>      |
>     export: osgi.wiring.package: org.apache.http
>   org.apache.httpcomponents.httpcore [osgi.identity; type="osgi.bundle"; version:Version="4.3.3.v201411290715"; osgi.identity="org.apache.httpcomponents.httpcore"]
> 
> Chain 2:
>   org.eclipse.aether.transport.http [osgi.identity; type="osgi.bundle"; version:Version="1.0.1.v20141111"; osgi.identity="org.eclipse.aether.transport.http"]
>     import: (&(osgi.wiring.package=org.apache.http.auth)(&(version>=4.2.1)(!(version>=4.4.0))))
>      |
>     export: osgi.wiring.package=org.apache.http.auth; uses:=org.apache.http.protocol
>   org.apache.httpcomponents.httpclient [osgi.identity; type="osgi.bundle"; version:Version="4.3.6.v201511171540"; osgi.identity="org.apache.httpcomponents.httpclient"]
>     import: (&(osgi.wiring.package=org.apache.http.protocol)(version>=4.3.3))
>      |
>     export: osgi.wiring.package: org.apache.http.protocol; uses:=org.apache.http
>     export: osgi.wiring.package=org.apache.http
>   org.apache.httpcomponents.httpcore [osgi.identity; type="osgi.bundle"; version:Version="4.4.6.v20170210-0925"; osgi.identity="org.apache.httpcomponents.httpcore"]

In my opinion, the above could be solved by wiring all packages imported
by bundle org.apache.httpcomponents.httpclient 4.3.6.v201511171540 to
the packages exported by bundle org.apache.httpcomponents.httpcore
4.3.3.v201411290715 (as is done in Neon.3), but apparently the presence
of a newer version of org.apache.httpcomponents.httpcore is too tempting
for Equinox.

Any insights on this issue are really appreciated.

Best wishes,

Andreas

[1] <https://bugs.eclipse.org/bugs/show_bug.cgi?id=513809#c0>

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