Index: src/java/org/apache/jdo/tck/api/instancecallbacks/CallingJdoPreclear.java
===================================================================
--- src/java/org/apache/jdo/tck/api/instancecallbacks/CallingJdoPreclear.java	(revision 426846)
+++ src/java/org/apache/jdo/tck/api/instancecallbacks/CallingJdoPreclear.java	(working copy)
@@ -96,6 +96,7 @@
         t.commit();
 
         InstanceCallbackClass.performPreClearTests = true;
+        t.setOptimistic(false);
         t.begin();
         try {
             primaryObj = (InstanceCallbackClass)pm.getObjectById(primaryObjId, true);