Hi.
I have a decorator for doctrine.orm.validator.unique which is tagged with validator.constraint_validator. With symfony 3.1.5 new checks were introduced in here

My decorator:

    app.decorating.doctrine_unique:
        class:     CapiBundle\Model\Validator\Constraints\UniqueEntityDecorator
        decorates: doctrine.orm.validator.unique
        arguments: ['@app.decorating.doctrine_unique.inner', '@doctrine']
        public:    false

results with exception The service "app.decorating.doctrine_unique.inner" must be public as it can be lazy-loaded.
Additionaly, InvalidArgumentException is not imported.