https://web-engineering.info/taxonomy/term/5 en https://web-engineering.info/node/36 <section class="field field-name-taxonomy-forums field-type-taxonomy-term-reference field-label-above view-mode-rss"><h2 class="field-label">Forums:&nbsp;</h2><ul class="field-items"><li class="field-item even" rel="sioc:has_container"><a href="/forum/5" typeof="sioc:Container sioc:Forum" property="rdfs:label skos:prefLabel" datatype="">Constraint Validation in Java EE</a></li></ul></section><div class="field field-name-body field-type-text-with-summary field-label-hidden view-mode-rss"><div class="field-items"><div class="field-item even" property="content:encoded"><p>I've seen that for a specific property, such as <code>title</code> from the <code>Book</code> class, two annotations are used to specify a not-null constraint: <code>@Column( nullable = false)</code> and <code>@NotNull</code>. Is this really necessarily or it is sufficient to use just one of them? And in case that one is sufficient, then, which one should we use?</p> </div></div></div> Wed, 23 Sep 2015 07:36:41 +0000 J.Ava 36 at https://web-engineering.info https://web-engineering.info/node/36#comments