diff --git a/.classpath b/.classpath
index a9a94b3..4482efd 100644
--- a/.classpath
+++ b/.classpath
@@ -32,6 +32,7 @@
 	</classpathentry>
 	<classpathentry kind="src" output="target/classes" path="target/generated-sources/jaxb">
 		<attributes>
+			<attribute name="ignore_optional_problems" value="true"/>
 			<attribute name="maven.pomderived" value="true"/>
 			<attribute name="optional" value="true"/>
 		</attributes>