title: GAE/J datastore : how to build an IN query with JDO
body: <p>I am trying to query a collection of entities by its key in the Google App Engine datastore.  This is the query I am trying to execute with no success:</p>
  
  <pre><code>Query query = pm.newQuery(Fix.class);
  query.setFilter("__key__ IN param");
  query.declareParameters("com.google.appengine.api.datastore.Key param");
  query.execute(list); // list is an array of keys
  </code></pre>
  
  <p>And the error I get is:</p>
  
  <pre><code>javax.jdo.JDOUserException: Portion of expression could not be parsed: IN param
  </code></pre>
  
  <p>Is it possible to use build an IN query with JDO or the low level API that finds entities by key?</p>