This is quite hot topic in blogs, just wanted to put short and clear list of arguments in favor of constructor injection.
- Autowired field or property can not be used in constructor, need special callback method for that
- Can not use final on autowired field or property
- No separation of concerns. Code with autowired fields becomes Spring specific. Others don't support it.
- Eliminating few lines of boilerplate required for constructor injection will not save you much time.
- With field or property injection code becomes unreadable for those who are not familiar with IOC.
- Field and property injection defeats purpose of constructor.
- If constructor needs too many arguments, it's a sign for refactoring.
- Most developers don't know all details of autowiring properties and fields and it's wrong to say that code becomes more readable.
- Property and field injection hides dependencies instead of making them explicit.
Happy autowiring :)
