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Weired JPA named query @NamedQuery behaviour
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created by <a href="http://community.jboss.org/people/TheGroove">Christian Groove</a> in <i>EJB3</i> - <a href="http://community.jboss.org/message/582625#582625">View the full discussion</a>
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<div class="jive-rendered-content"><p>Salut</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>i recogniozed a strange behaviour, declaring anmed</p><p>queries with a annotation. Here is some code:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier;">@NamedQueries(</span></p><p><span style="font-family: courier new,courier;">    {</span></p><p><span style="font-family: courier new,courier;">        @NamedQuery(</span></p><p><span style="font-family: courier new,courier;">            name=Dbean1.GET_COMPOSITION, </span></p><p><span style="font-family: courier new,courier;">            query=Dbean1.JPQL_COMPOSITION)</span></p><p><span style="font-family: courier new,courier;">    }</span></p><p><span style="font-family: courier new,courier;">)</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>where:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier;">@Entity</span></p><p><span style="font-family: courier new,courier;">public class Dbean1. implements Serializable </span></p><p><span style="font-family: courier new,courier;">{</span></p><p><span style="font-family: courier new,courier;">   /* some code */</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier;">   final public static String GET_COMPOSITION = ".... composition " ;</span></p><p><span style="font-family: courier new,courier;">   final public static String GET_COMPOSITION = "SELECT dbean FROM ..... " ;</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>this looks fine. But imagine iff you a to implement a recurring part of the</p><p>where expression and start thinking of a java code, that could help you to</p><p>create that JPA-QL string.</p><p>So when you write:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier;">@Entity</span></p><p><span style="font-family: courier new,courier;">public class Dbean1. implements Serializable </span></p><p><span style="font-family: courier new,courier;">{</span></p><p><span style="font-family: courier new,courier;">   /* some code */</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier;">   final public static String GET_COMPOSITION      = ".... composition " ;</span></p><p><span style="font-family: courier new,courier;"><br/></span></p><p><span style="font-family: courier new,courier;">   final public static String <strong>GENERATED_WHERE_EXPR</strong> = generateWehreCompo() ;</span></p><p><span style="font-family: courier new,courier;"><br/></span></p><p><span style="font-family: courier new,courier;">   final public static String GET_COMPOSITION      = </span></p><p><span style="font-family: courier new,courier;">                          "SELECT dbean FROM ..... +<br/></span></p><p><span style="font-family: courier new,courier;">                          WHERE" + <strong>GENERATED_WHERE_EXPR</strong>  ... ;<br/></span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>JBoss5.1 will tell you "<em>The value for annotation attribute NamedQuery.query must be a </em></p><p><em>constant expression</em>" So is <span style="font-family: courier new,courier;">final private static</span> not constant enough ???</p></div>
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