Pankraz76 commented on PR #2287:
URL: https://github.com/apache/maven/pull/2287#issuecomment-2868705455
> This is not a drop in replacement. This changes a lot of modifiable lists
to immutable lists. In some cases here this is clearly fine — e.g. when all
that''s done next is findFirst — but others aren't so obvious. This is really,
really hard to debug when it goes wrong. I would limit this PR to cases where
the lsist does not escape the method or perhaps the class.
## Immutable Objects and Thread Safety
If someone wants to deviate from the happy path, they should work with a
copy of final and secure state - and by happy with that.
### Core Principles:
1. **Final/immutable by Default**:
Everything should be `final/immutable` unless there's a compelling reason
not to be.
2. **External Manipulation**:
If external modification is absolutely necessary:
- The requester should receive a defensive copy
- All modifications must go through our controlled interface
- We maintain the immutable original as the source of truth
### Important Considerations:
- **Strict Data Control**:
Every modifiable reference is a potential deviation from our secure,
immutable approach.
We don't allow external code to directly manipulate our internal state.
- **Side Effect Prevention**:
Non-final references can lead to unpredictable side effects and thread
safety issues.
### Reference:
[Immutable Objects - Thread
Safety](https://en.wikipedia.org/wiki/Immutable_object#Thread_safety)
### Implementation Strategy:
For production systems:
1. Audit to identify genuine needs for mutability
2. Create exception pathways with proper safeguards:
- Defensive copying
- Controlled mutation interfaces
3. Always preserve the immutable source
4. Document all deviation points rigorously
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