[KAFKA-14654] Connectors have incorrect Thread Context Classloader during initialization

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.1.0, 3.0.0, 3.2.0, 3.3.0, 3.4.0
• Fix Version/s: 3.6.0
• Component/s: connect
• Assignee: Greg Harris
• Reporter: Greg Harris
• Created: 25/Jan/23 17:54
• Updated: 25/May/23 14:23
• Resolved: 25/May/23 14:23

Description

This is the same underlying issue as https://issues.apache.org/jira/browse/KAFKA-8340 , which fixed the thread context classloader for service loaded plugins, and for plugins which are first loaded after plugin path scanning.
However, that correction PR failed to fix the context classloader for Connector classes, which are first instantiated and initialized during plugin path scanning, via the versionFor method.

Issue Links

• Discovered while testing: KAFKA-14627 Modernize Connect plugin discovery
• is related to: KAFKA-14670 Refactor connect plugins to be called from wrapper classes
• is required by: KAFKA-14863 Plugins which do not have a valid no-args constructor are visible in the REST API
• relates to: KAFKA-8340 ServiceLoader fails when used from isolated plugin path directory
• links to: GitHub Pull Request #13165