fix error message for Java 5
diff --git a/src/test/java/org/yaml/snakeyaml/generics/ObjectValuesTest.java b/src/test/java/org/yaml/snakeyaml/generics/ObjectValuesTest.java
index 10d3204..856bff8 100644
--- a/src/test/java/org/yaml/snakeyaml/generics/ObjectValuesTest.java
+++ b/src/test/java/org/yaml/snakeyaml/generics/ObjectValuesTest.java
@@ -92,8 +92,7 @@
         try {
             ov2.getPossible()[0].toString();
         } catch (Exception e) {
-            assertEquals("[Ljava.lang.Object; cannot be cast to [Ljava.lang.String;", e
-                    .getMessage());
+            assertTrue(e.getMessage(), e.getMessage().startsWith("[Ljava.lang.Object"));
         }
     }
 }