Stage classes should only have 0-arg constructors
Description
Environment
Activity
Note that the one-arg constructor is deprecated, and has a DeprecationSupport warning. I’ve made a point of saying in the release notes that this will be removed in 1.0.0.
Done, commit 97686fd8daccb2359d051613f0a1421beca9d387.
It turns out that GenerateIdStage is the only case.
I’m trying to recall the original reasoning behind this. Part of it was certainly consistency (most Stages are like this, so all of them should be) but I think that original push originally came from the IdP and the business with constructor names being a little weird in Spring, for which we now use a custom annotation and may also need to use the javac -parameters longer term.
It would in many ways be nice to move in the opposite direction, towards using constructor arguments as much as possible so that more fields can be final. This would help the compiler and the nullability analyser out. Stages are however all (by definition), identifiable components and that mandates a mutable id field… so we can never fully avoid properties.
One counterexample to this is
GenerateIdStage, which has a constructor providing a strategy bean, defaulting to an instance of a specific default strategy.This should be done with a property instead, the default value being applied during bean initialisation.