The buildIndex() magic expects an array of colums, not a list.

src/java/com/samskivert/depot/impl/DepotMarshaller.java

@@ -40,6 +40,7 @@ import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
 
 import com.samskivert.util.ArrayUtil;
+import com.samskivert.util.StringUtil;
 import com.samskivert.util.Tuple;
 
 import com.samskivert.jdbc.ColumnDefinition;
@@ -229,14 +230,15 @@ public class DepotMarshaller<T extends PersistentRecord>
             if (entity != null) {
                 // add any indices needed for uniqueness constraints
                 for (UniqueConstraint constraint : entity.uniqueConstraints()) {
-                    List<ColumnExp> colExps = Lists.newArrayList();
+                    ColumnExp[] colExps = new ColumnExp[constraint.fields().length];
+                    int ii = 0;
                     for (String field : constraint.fields()) {
                         FieldMarshaller<?> fm = _fields.get(field);
                         if (fm == null) {
                             throw new IllegalArgumentException(
                                 "Unknown unique constraint field: " + field);
                         }
-                        colExps.add(new ColumnExp(_pClass, field));
+                        colExps[ii ++] = new ColumnExp(_pClass, field);
                     }
                     _indexes.add(buildIndex(constraint.name(), true, colExps));
                 }
@@ -1118,6 +1120,11 @@ public class DepotMarshaller<T extends PersistentRecord>
                 pkColumns.add(rs.getString("COLUMN_NAME"));
             }
         }
+        
+        public String toString ()
+        {
+            return StringUtil.fieldsToString(this);
+        }
     }
 
     /** The persistent object class that we manage. */