[SLING-1636] Provide a mechanism to detect if a dynamic classloader is still valid

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Commons ClassLoader 1.1.4
• Fix Version/s: Commons ClassLoader 1.2.0
• Component/s: Commons
• Assignee: Carsten Ziegeler
• Reporter: Carsten Ziegeler
• Created: 10/Aug/10 10:05
• Updated: 20/Sep/17 13:02
• Resolved: 10/Aug/10 10:08

Description

In some situations it is useful to know if a used classloader is still live/valid. Especially with dynamic class loaders it happens that a classloader gets invalidated but is still in use. In such cases the client of such a classloader should be able to detect this and reload classes.

One use case is scripting in Sling: we have the JCR based classloader and for example compiled scripts. A JCR classloader gets invalid as soon as something changes with the classes it has loaded in the repository. In this case the jsp script engine should reload the compiled classes