Putting Cayenne Files in Web Application CLASSPATH
When deploying an application in a web container it is possible to follow the procedure for the standalone applications, i.e. put all XML files in the application CLASSPATH (e.g. in "mywebapp/WEB-INF/classes/", but DON'T put it in container shared locations!). Session DataContext can be obtained via ServletUtil:
HttpSession session = ...;
DataContext context = ServletUtil.getSessionContext(session);
However you may consider a deployment procedure described below, as it provides more flexibility and a number of additional useful features.
Cayenne Servlet Filter
Adding the following filter to the web.xml would automate Cayenne setup in the web application:
The filter will ensure that for each matching request a ObjectContext (which is actually a DataContext instance) is bound to the request thread. So you can retrieve it anywhere in the application, even if you don't have a reference to the web environment:
ObjectContext context = BaseContext.getThreadObjectContext();
Filter can match a specific URL as shown above, or a specific servlet:
Additionally the filter supports putting files in myapp/WEB-INF/ directory instead of the CLASSPATH, so a .war file may look like this:
Actually, Cayenne files can be stored in any subdirectory of myapp/WEB-INF/. To specify a subdirectory, you'll need to add <context-param> named cayenne.configuration.path to your application descriptor:
