Here is a picture - because they are worth 1000 words
GeoServer Stack Struts Stack
+-----------------------------+------------------------------------+
| servlett getCapabilities | view WFSDefinition.jsp |
| | |
+-----------------------------+-form------WFSDefinitionForm--------+
| | |
| request | action WFSDefinitionAction |
| response | |
+-----------------------------+------------------------------------+
| WMSGlobal | config WFSConfig |
+-----------------------------+------------------------------------+