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code-style UnnecessaryConstructor (PMD)

Avoid unnecessary constructors - the compiler will generate these for you

This rule detects when a constructor is not necessary; i.e., when there's only one constructor, it's public, has an empty body, and takes no arguments.

  
public class Foo {
 public Foo() {}
}
  
      

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