Removal planned (tentative) 31 December 2027
Moving from Commons Collections 3 to Collections 4 in AEM
Deprecated on 30 April 2021 with a tentative removal date of 31 December 2027.
Affected packages and APIs
org.apache.commons.collections.*
What to use instead
org.apache.commons.collections4 or standard JDK collections and streams.
How to fix it
- Change imports to collections4; generic signatures change, so fix compile errors.
- Prefer JDK streams where the helper is trivial.
How we detect it
- Readiness scan rule
commons-collections3: Apache Commons Collections 3.
Best Practices Analyzer reports it under OCU.
Can agents fix it?
High.
Source: Adobe Experience League. Checked 19 October 2026.