[FELIX-5944] Add additional checks for concurrent unregistering of web components

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: http.jetty-4.0.6, http.base-4.0.4, http.bridge-4.0.4
• Fix Version/s: http.base-4.0.6, http.jetty-4.0.8, http.bridge-4.0.6
• Component/s: HTTP Service
• Assignee: Carsten Ziegeler
• Reporter: Carsten Ziegeler
• Created: 25/Sep/18 15:14
• Updated: 01/Mar/19 14:13
• Resolved: 25/Sep/18 15:16

Description

It might happen that a filter, servlet or preprocessor is added to a processing chain for a web request and while the chain is executed, this component gets unregistered.
This can currently result in various NullPointerExceptions - we could improve this and check for null and throw a ServletException instead