Wasn&#x27;t there an @Immutable assertion in JSR-305? 
Why not reuse that?<p>EDIT: actually predating that JSR, coming from here <a href="http:&#x2F;&#x2F;jcip.net&#x2F;annotations&#x2F;doc&#x2F;index.html" rel="nofollow">http:&#x2F;&#x2F;jcip.net&#x2F;annotations&#x2F;doc&#x2F;index.html</a>