title: spring data jpa multiple sorting
body: <p>I am using spring data jpa and JQGrid. I need response based on multiple sort parameters.
  I tried using sort parameter=column a,column b and sort order=asc but I am getting an exception </p>
  
  <blockquote>
    <p>:No property column a,column b found in pojo.</p>
  </blockquote>
  
  <p>It works if I would pass either of one columns as sort parameter.
  Code:</p>
  
  <pre><code>Pageable pageable = JPAUtility.constructPageSpecification(pageNumber, rowsPerPage, sortColName, sortOrder);
  </code></pre>
  
  <p>How can I pass multiple column names in <code>sortColName</code> parameter?</p>