maven-plugins/pmd/rulesets/unusedcode.xml

<?xml version="1.0"?>

<ruleset name="Unused Code Rules">
  <description>
The Unused Code Ruleset contains a collection of rules that find unused code.
  </description>


  <rule name="UnusedPrivateField"
        message="Avoid unused private fields such as ''{0}''"
        class="net.sourceforge.pmd.rules.UnusedPrivateFieldRule">
    <description>
Unused Private Field detects when a private field is declared
that is not used by the class.
    </description>
    <example>
<![CDATA[
public class Something {
  private static int FOO = 2; // Unused
  private int i = 5; // Unused
  private int j = 6;

  public int addOne() {
    return j++;
  }
}
]]>
    </example>
  </rule>

<rule name="UnusedLocalVariable"
        message="Avoid unused local variables such as ''{0}''"
        class="net.sourceforge.pmd.rules.UnusedLocalVariableRule">
    <description>
Unused Local Variables detects when a variable is declared, but not
used (except for possibly initial assignment)
    </description>

    <example>
<![CDATA[
public int doSomething() {
  int i = 5; // Unused
  int j = 6;
  j += 3;
  return j;
}
]]>
    </example>
  </rule>



    <rule name="UnusedPrivateMethod"
        message="Avoid unused private methods such as ''{0}''"
        class="net.sourceforge.pmd.rules.UnusedPrivateMethodRule">
    <description>
Unused Private Method detects when a private method is declared but is unused.
    </description>
    <example>
<![CDATA[
public class Something {
 private void foo() {} // unused
}
]]>
    </example>
  </rule>


  <rule name="UnusedFormalParameter"
        message="Avoid unused formal parameters such as ''{0}''"
        class="net.sourceforge.pmd.rules.UnusedFormalParameterRule">
    <description>
Avoid passing parameters to methods and then not using those parameters.
    </description>

    <example>
<![CDATA[
public class Foo {
 private void bar(String howdy) {
  // howdy is not used
 }
]]>
    </example>
  </rule>

  <rule name="UnnecessaryConstructorRule"
        message="Avoid unnecessary constructors - the compiler will generate these for you"
        class="net.sourceforge.pmd.rules.UnnecessaryConstructorRule">
    <description>
Unnecessary constructor 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.
    </description>
    <example>
<![CDATA[
public class Foo {
 public Foo() {}
}
]]>
    </example>
  </rule>

</ruleset>