target is Java5, replaced String#isEmpty() signature

Author: simotripo

src/test/java/org/apache/ibatis/submitted/lazy_immutable/ImmutablePOJOTest.java

@@ -70,7 +70,7 @@ public void testLoadLazyImmutablePOJO() {
 
             assertEquals(POJO_ID, pojo.getId());
             assertNotNull("Description should not be null.", pojo.getDescription());
-            assertFalse("Description should not be empty.", pojo.getDescription().isEmpty());
+            assertFalse("Description should not be empty.", pojo.getDescription().length() == 0);
         } finally {
             session.close();
         }