OSGi bundles have constraint violations when client and server are used in the same OSGi environment #3
Description
We want to upgrade from the old xmlrpc 3.1.3 bundles that are no longer updated to your fork of the project.
We have an product with server/agent/frontend architecture where a single OSGi environment needs to have both server and client functionality of XMLRPC and as such requires both client and server packages. When we updated our dependency tree to use version 4.0.0 of your product, we got this error:
INFO | jvm 1 | 2025/05/09 15:51:33 | org.apache.felix.resolver.reason.ReasonException: Uses constraint violation. Unable to resolve resource be.ikan.lib.util.xmlrpc [be.ikan.lib.util.xmlrpc/7.0.0] because it is exposed to package 'org.apache.xmlrpc' from resources com.evolvedbinary.thirdparty.org.apache.xmlrpc.xmlrpc-server [com.evolvedbinary.thirdparty.org.apache.xmlrpc.xmlrpc-server/4.0.0] and com.evolvedbinary.thirdparty.org.apache.xmlrpc.xmlrpc-client [com.evolvedbinary.thirdparty.org.apache.xmlrpc.xmlrpc-client/4.0.0] via two dependency chains.
INFO | jvm 1 | 2025/05/09 15:51:33 |
INFO | jvm 1 | 2025/05/09 15:51:33 | Chain 1:
INFO | jvm 1 | 2025/05/09 15:51:33 | be.ikan.lib.util.xmlrpc [be.ikan.lib.util.xmlrpc/7.0.0]
INFO | jvm 1 | 2025/05/09 15:51:33 | import: (&(osgi.wiring.package=org.apache.xmlrpc)(version>=4.0.0)(!(version>=5.0.0)))
INFO | jvm 1 | 2025/05/09 15:51:33 | |
INFO | jvm 1 | 2025/05/09 15:51:33 | export: osgi.wiring.package: org.apache.xmlrpc
INFO | jvm 1 | 2025/05/09 15:51:33 | com.evolvedbinary.thirdparty.org.apache.xmlrpc.xmlrpc-server [com.evolvedbinary.thirdparty.org.apache.xmlrpc.xmlrpc-server/4.0.0]
INFO | jvm 1 | 2025/05/09 15:51:33 |
INFO | jvm 1 | 2025/05/09 15:51:33 | Chain 2:
INFO | jvm 1 | 2025/05/09 15:51:33 | be.ikan.lib.util.xmlrpc [be.ikan.lib.util.xmlrpc/7.0.0]
INFO | jvm 1 | 2025/05/09 15:51:33 | import: (&(osgi.wiring.package=org.apache.xmlrpc.client)(version>=4.0.0)(!(version>=5.0.0)))
INFO | jvm 1 | 2025/05/09 15:51:33 | |
INFO | jvm 1 | 2025/05/09 15:51:33 | export: osgi.wiring.package: org.apache.xmlrpc.client; uses:=org.apache.xmlrpc
INFO | jvm 1 | 2025/05/09 15:51:33 | export: osgi.wiring.package=org.apache.xmlrpc
INFO | jvm 1 | 2025/05/09 15:51:33 | com.evolvedbinary.thirdparty.org.apache.xmlrpc.xmlrpc-client [com.evolvedbinary.thirdparty.org.apache.xmlrpc.xmlrpc-client/4.0.0]
INFO | jvm 1 | 2025/05/09 15:51:33 | at org.apache.felix.resolver.ResolverImpl$UseConstraintError.toException(ResolverImpl.java:2471)
INFO | jvm 1 | 2025/05/09 15:51:33 | at org.apache.felix.resolver.ResolverImpl.doResolve(ResolverImpl.java:420)
INFO | jvm 1 | 2025/05/09 15:51:33 | at org.apache.felix.resolver.ResolverImpl.resolve(ResolverImpl.java:378)
INFO | jvm 1 | 2025/05/09 15:51:33 | at org.apache.felix.resolver.ResolverImpl.resolve(ResolverImpl.java:332)
INFO | jvm 1 | 2025/05/09 15:51:33 | at org.apache.karaf.features.internal.region.SubsystemResolver.resolve(SubsystemResolver.java:257)
INFO | jvm 1 | 2025/05/09 15:51:33 | at org.apache.karaf.features.internal.service.Deployer.deploy(Deployer.java:401)
INFO | jvm 1 | 2025/05/09 15:51:33 | at org.apache.karaf.features.internal.service.FeaturesServiceImpl.doProvision(FeaturesServiceImpl.java:1063)
INFO | jvm 1 | 2025/05/09 15:51:33 | at org.apache.karaf.features.internal.service.FeaturesServiceImpl.lambda$doProvisionInThread$13(FeaturesServiceImpl.java:998)
INFO | jvm 1 | 2025/05/09 15:51:33 | at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
INFO | jvm 1 | 2025/05/09 15:51:33 | at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
INFO | jvm 1 | 2025/05/09 15:51:33 | at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
INFO | jvm 1 | 2025/05/09 15:51:33 | at java.base/java.lang.Thread.run(Thread.java:829)
INFO | jvm 1 | 2025/05/09 15:51:33 | 2025-05-09 15:51:33,183 [FelixStartLevel] ERROR BootFeaturesInstaller | 13 - org.apache.karaf.features.core - 4.2.15 | Error installing boot features
INFO | jvm 1 | 2025/05/09 15:51:33 | org.apache.felix.resolver.reason.ReasonException: Uses constraint violation. Unable to resolve resource be.ikan.lib.util.xmlrpc [be.ikan.lib.util.xmlrpc/7.0.0] because it is exposed to package 'org.apache.xmlrpc' from resources com.evolvedbinary.thirdparty.org.apache.xmlrpc.xmlrpc-server [com.evolvedbinary.thirdparty.org.apache.xmlrpc.xmlrpc-server/4.0.0] and com.evolvedbinary.thirdparty.org.apache.xmlrpc.xmlrpc-client [com.evolvedbinary.thirdparty.org.apache.xmlrpc.xmlrpc-client/4.0.0] via two dependency chains.
INFO | jvm 1 | 2025/05/09 15:51:33 |
INFO | jvm 1 | 2025/05/09 15:51:33 | Chain 1:
INFO | jvm 1 | 2025/05/09 15:51:33 | be.ikan.lib.util.xmlrpc [be.ikan.lib.util.xmlrpc/7.0.0]
INFO | jvm 1 | 2025/05/09 15:51:33 | import: (&(osgi.wiring.package=org.apache.xmlrpc)(version>=4.0.0)(!(version>=5.0.0)))
INFO | jvm 1 | 2025/05/09 15:51:33 | |
INFO | jvm 1 | 2025/05/09 15:51:33 | export: osgi.wiring.package: org.apache.xmlrpc
INFO | jvm 1 | 2025/05/09 15:51:33 | com.evolvedbinary.thirdparty.org.apache.xmlrpc.xmlrpc-server [com.evolvedbinary.thirdparty.org.apache.xmlrpc.xmlrpc-server/4.0.0]
INFO | jvm 1 | 2025/05/09 15:51:33 |
INFO | jvm 1 | 2025/05/09 15:51:33 | Chain 2:
INFO | jvm 1 | 2025/05/09 15:51:33 | be.ikan.lib.util.xmlrpc [be.ikan.lib.util.xmlrpc/7.0.0]
INFO | jvm 1 | 2025/05/09 15:51:33 | import: (&(osgi.wiring.package=org.apache.xmlrpc.client)(version>=4.0.0)(!(version>=5.0.0)))
INFO | jvm 1 | 2025/05/09 15:51:33 | |
INFO | jvm 1 | 2025/05/09 15:51:33 | export: osgi.wiring.package: org.apache.xmlrpc.client; uses:=org.apache.xmlrpc
INFO | jvm 1 | 2025/05/09 15:51:33 | export: osgi.wiring.package=org.apache.xmlrpc
INFO | jvm 1 | 2025/05/09 15:51:33 | com.evolvedbinary.thirdparty.org.apache.xmlrpc.xmlrpc-client [com.evolvedbinary.thirdparty.org.apache.xmlrpc.xmlrpc-client/4.0.0]
INFO | jvm 1 | 2025/05/09 15:51:33 | at org.apache.felix.resolver.ResolverImpl$UseConstraintError.toException(ResolverImpl.java:2471)
INFO | jvm 1 | 2025/05/09 15:51:33 | at org.apache.felix.resolver.ResolverImpl.doResolve(ResolverImpl.java:420)
INFO | jvm 1 | 2025/05/09 15:51:33 | at org.apache.felix.resolver.ResolverImpl.resolve(ResolverImpl.java:378)
INFO | jvm 1 | 2025/05/09 15:51:33 | at org.apache.felix.resolver.ResolverImpl.resolve(ResolverImpl.java:332)
INFO | jvm 1 | 2025/05/09 15:51:33 | at org.apache.karaf.features.internal.region.SubsystemResolver.resolve(SubsystemResolver.java:257)
INFO | jvm 1 | 2025/05/09 15:51:33 | at org.apache.karaf.features.internal.service.Deployer.deploy(Deployer.java:401)
INFO | jvm 1 | 2025/05/09 15:51:33 | at org.apache.karaf.features.internal.service.FeaturesServiceImpl.doProvision(FeaturesServiceImpl.java:1063)
INFO | jvm 1 | 2025/05/09 15:51:33 | at org.apache.karaf.features.internal.service.FeaturesServiceImpl.lambda$doProvisionInThread$13(FeaturesServiceImpl.java:998)
INFO | jvm 1 | 2025/05/09 15:51:33 | at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
INFO | jvm 1 | 2025/05/09 15:51:33 | at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
INFO | jvm 1 | 2025/05/09 15:51:33 | at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
INFO | jvm 1 | 2025/05/09 15:51:33 | at java.base/java.lang.Thread.run(Thread.java:829)
When looking at your 4.0.0 bundle contents and comparing them to the old XMLRPC 3.1.3 bundles, this is how they compare. First the old 3.1.3 bundles:
then your 4.0.0 bundles:
In an OSGi environment, there should not be any shared packages and/or classes between bundles. This is precisely why there are separate client, common and server bundles that can be used separately or as a whole.