JNDI/JCA Scrapbook

A repository of notes and comments that will eventually make their way into the documentation. Please treat the information here with caution, it has often not been verified.

Find web-app directory from JNDI bean?

In generic Servlet we can use ServletContext.getRealPath() to get real webapp's directory. And then we can use that to load configuration files.

But, suppose there is a JavaBean used via <resource-ref> tag in web.xml, is there anyway for the Bean to get the webapp's context directory? I hope not to hardcode the path in the web.xml.

Mattias Jiderhamn writes:

I solved a similar problem by having a load-on-startup servlet that in its init() puts the application root in another JNDI reference, like this:

public class InitServlet extends HttpServlet { public void init() throws ServletException { ServletContext ctx = this.getServletContext(); String contextRoot = ctx.getRealPath("/"); System.out.println(" The real path of the application is: " + contextRoot); try { Context env = (Context) new InitialContext().lookup("java:comp/env"); env.createSubcontext("ourApplication"); env.rebind("ourApplication/application-root", contextRoot); } catch(NamingException nex) { nex.printStackTrace(System.err); throw new ServletException(nex); } } }