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code-style ImmutableField (PMD)

Identifies private fields whose values never change once they are initialized either in the declaration of the field or by a constructor. This aids in converting existing classes to immutable classes.

  
public class Foo {
  private int x; // could be final
  public Foo() {
      x = 7;
  }
  public void foo() {
     int a = x + 2;
  }
}
  
      

Additional info can be found at this http://pmd.sourceforge.net/rules/design.html#ImmutableField site.