Why is this an issue?
A long parameter list can indicate that a new structure should be created to wrap the numerous parameters or that the function is doing too many
things.
Noncompliant code example
With a maximum number of 4 parameters:
public void doSomething(int param1, int param2, int param3, String param4, long param5) {
...
}
Compliant solution
public void doSomething(int param1, int param2, int param3, String param4) {
...
}
Exceptions
Methods annotated with :
- Spring’s
@RequestMapping (and related shortcut annotations, like @GetRequest)
- JAX-RS API annotations (like
@javax.ws.rs.GET)
- Bean constructor injection with
@org.springframework.beans.factory.annotation.Autowired
- CDI constructor injection with
@javax.inject.Inject
-
@com.fasterxml.jackson.annotation.JsonCreator
- Micronaut’s annotations (like
@io.micronaut.http.annotation.Get)
may have a lot of parameters, encapsulation being possible. Such methods are therefore ignored.
Also, if a class annotated as a Spring component (like @org.springframework.stereotype.Component) has a single constructor, that
constructor will be considered @Autowired and ignored by the rule.
