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POReturning spatial data with Hibernate
 

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    <p>I am trying to return spatial data (ie Point) from database using Hibernate Spatial library (http://www.hibernatespatial.org/) using this WORKING approach...</p> <pre><code> ... Session session = sessionFactory.openSession(); Query query = session.createQuery("select location, distance(location, :requestPoint) from "+Event.class.getName()); query.setParameter("requestPoint", requestPoint); List&lt;?&gt; rows = query.list(); session.close(); List&lt;Event&gt; events = new ArrayList&lt;Event&gt;(); for (Iterator&lt;?&gt; it = rows.iterator(); it.hasNext(); ) { Object[] row = (Object[]) it.next(); Event event = new Event(); event.setLocation((Point) row[0]); event.setDistance((Double) row[1]); events.add(event); } return events; </code></pre> <p>but I would like to use something like this (use Event class constructor in select statment)...</p> <pre><code> Session session = sessionFactory.openSession(); Query query = session.createQuery("select new Event(location, distance(location, :requestPoint)) from "+Event.class.getName()); query.setParameter("requestPoint", requestPoint); List&lt;Event&gt; rows = query.list(); session.close(); return rows; </code></pre> <p>The problem is that the second approach gives me following exception...</p> <pre><code>org.hibernate.hql.internal.ast.QuerySyntaxException: Unable to locate appropriate constructor on class [com.jaygridley.aet.Event] [select new Event(location, distance(location, :requestPoint)) from com.jaygridley.aet.domain.Event] </code></pre> <p>but I cannot see why, because inside of my Event class I have a constructor...</p> <pre><code>public Event(Point location, Double distance) { this.location = location; this.distance = distance; } </code></pre> <p>for clarity Event class has following properties...</p> <pre><code>@Column(name="LOCATION", columnDefinition = "MDSYS.SDO_GEOMETRY", nullable = false) @Type(type = "org.hibernate.spatial.GeometryType") private Point location; private Double distance; </code></pre> <p>I have checked return class for each column that Hibernate returns and it matches Point and Double. Does anyone has any idea what I am doing wrong? Thanks you!</p>
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