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Reports any cases in which <code>java.util.Optional&lt;T&gt;</code>, <code>java.util.OptionalDouble</code>, <code>java.util.OptionalInt</code>,
<code>java.util.OptionalLong</code>, or <code>com.google.common.base.Optional</code> are used as types for fields or parameters.
<p><code>Optional</code> was designed to provide a limited mechanism for library method return types in which a clear way to represent "no result"
  was needed.</p>
<p>Using a field with the <code>java.util.Optional</code> ty