diff -u -r1.3 -r1.4
--- ExampleRawTrackerHitReadoutDriver.java	3 Jul 2007 23:15:32 -0000	1.3
+++ ExampleRawTrackerHitReadoutDriver.java	3 Jul 2007 23:56:11 -0000	1.4
@@ -26,7 +26,7 @@

  * {@link org.lcsim.event.RawTrackerHit}s from {@link SimTrackerHit} collections.
  * 
  * @author Jeremy McCormick

- * @version $Id: ExampleRawTrackerHitReadoutDriver.java,v 1.3 2007/07/03 23:15:32 jeremy Exp $

+ * @version $Id: ExampleRawTrackerHitReadoutDriver.java,v 1.4 2007/07/03 23:56:11 jeremy Exp $

  */
 public class ExampleRawTrackerHitReadoutDriver
 extends Driver

@@ -50,6 +50,8 @@

                     {
                         for (IDetectorElement sensor : module.getChildren())
                         {

+                        	// Check that IdentifierHelper is retrievable.
+                        	sensor.getIdentifierHelper();

                             IReadout readout = sensor.getReadout();
                             List <SimTrackerHit> simHits = readout.getHits(SimTrackerHit.class);