REST API to create flows

Change-Id: I5d001782249c0eab249d7aa857ae465da95b5955
diff --git a/web/api/src/main/webapp/WEB-INF/web.xml b/web/api/src/main/webapp/WEB-INF/web.xml
index a3e2060..d8759fe 100644
--- a/web/api/src/main/webapp/WEB-INF/web.xml
+++ b/web/api/src/main/webapp/WEB-INF/web.xml
@@ -61,6 +61,7 @@
                 org.onosproject.rest.exceptions.ServerErrorMapper,
                 org.onosproject.rest.exceptions.BadRequestMapper,
                 org.onosproject.rest.exceptions.WebApplicationExceptionMapper,
+                org.onosproject.rest.exceptions.IllegalArgumentExceptionMapper,
                 org.onosproject.rest.resources.JsonBodyWriter,
 
                 org.onosproject.rest.resources.ApplicationsWebResource,