[ARIES-2110] Using aries to load TwelveMonkeys SPI plugins causes "No common superclass" errors for unrelated classes

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: SPI Fly
• Assignee: Unassigned
• Reporter: Steinar Bang
• Created: 14/Aug/23 19:40
• Updated: 14/Aug/23 19:56

Description

I am trying to use Apache Aries to load an OSGi-fied version of the TwelveMonkeys library (I am creating a PR to turn TwelveMonkeys into OSGi bundles with ProvideCapability headers for the ImageIO SPI plugins.

However, when I try to use the OSGi-fied TwelveMonkeys library from this bundle:
https://github.com/steinarb/oldalbum
I get a strange error when attempting to load the bundle in apache karaf: https://gist.github.com/steinarb/4fc4b86c49cbdb151d8b9e626366ff07#file-karaf-log-L790

"java.lang.RuntimeException: No Common Superclass:no/priv/bang/oldalbum/services/bean/AlbumEntry java/sql/ResultSet"

There is nothing in my code that tries to unify AlbumEntry or ResultSet.

But there is a method that unpacks a row in a ResultSet into an albumentry:
https://github.com/steinarb/oldalbum/blob/master/oldalbum.backend/src/main/java/no/priv/bang/oldalbum/backend/OldAlbumServiceProvider.java#L819

Is that method the cause of the misunderstanding?

Is there a way to avoid this error?

My platform build and run, is:

• debian 12.1 "bookworm", amd64
• java 17
• maven 3.8.7
• maven-bundle-plugin 5.1.9
• apache karaf 4.4.3