java - Parameter as Left Hand Side Operator LIKE JPQL -

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i’m trying execute following query: (using eclipselink 2.5.2, mysql 5.5)

em.createquery("select r region r (:pattern concat(r.pattern, '%'))")             .setparameter("pattern", "eu.fr.pr")             .getresultlist();

(background: i’m trying find super regions of region. super regions of eu.fr.pr eu.fr , eu.)

however throws following exception:

java.lang.illegalargumentexception: have attempted set value of type class java.lang.string parameter pattern expected type of class java.lang.boolean query string

the oracle docs state

a expression determines whether wildcard pattern matches string.

the relevant parts of region class are:

@entity @namedquery(name="region.findall", query="select r region r") public class region implements serializable {     private static final long serialversionuid = 1l;      @id     @generatedvalue(strategy=generationtype.identity)     private int id;      private string pattern;      public region() {     }      public string getpattern() {         return this.pattern;     }      public void setpattern(string pattern) {         this.pattern = pattern;     }  }

here sample data table:

+----+-------------+ | id | pattern     | +----+-------------+ |  3 | eu          | |  5 | eu.fr       | |  6 | eu.fr.al    | | 13 | eu.fr.lu    | | 14 | eu.fr.pr    | | 15 | eu.fr.pr.ba | | 16 | eu.fr.pr.ca | | 17 | eu.fr.pr.pa | | 18 | eu.fr.rh    | | 19 | eu.fr.rh.tv | | 20 | eu.fr.ro    | +----+-------------+

so why should pass boolean?

directly concatenating region query ("select r region r ('" + theregion + "' concat(r.pattern, '%'))") gives expected results not want in production. bug in eclipselink?


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