Reported in ticket https://mynms.opennms.com/Ticket/Display.html?id=4285

Clicking on a physical interface from the node detail page takes you to /element/snmpinterface.jsp, but only the header renders; the page content area is empty.

I've tracked it down to a bad jsp:include tag in snmpinterface.jsp. The include references /includes/interfaceSTP-box.jsp which does not exist. Removing this include allows the rest of the page to render correctly.

Exception stack trace from web.log: