Why is this an issue?

Duplicated string literals make the process of refactoring complex and error-prone, as any change would need to be propagated on all occurrences.

Exceptions

To prevent generating some false-positives, literals having 5 or less characters are excluded as well as literals containing only letters, digits and '_'.

How to fix it

Use constants to replace the duplicated string literals. Constants can be referenced from many places, but only need to be updated in a single place.

Code examples

Noncompliant code example

With the default threshold of 3:

public def run() {
  prepare("action random1")    // Noncompliant - "action random1" is duplicated 3 times
  execute("action random1")
  release("action random1")
}

Compliant solution

public def run() {
  val Action = "action random1"
  prepare(Action)
  execute(Action)
  release(Action)
}