How can I print a servlet context attribute in EL?

Question

Is there a way I can get a attribute set in ServletContext in EL so that it ends up as a JavaScript variable?

I am setting it as

context.setAttribute("testing.port", "9000");

I tried retrieving it like

alert("port" +'${testing.port}');

I am just getting a blank.

Answer 1

The problem is the period (.) in the key name. EL interprets the period as a call to an accessor method named getPort¹ on whatever object testing references. Fetch the value from the appropriate implicit object:

${applicationScope['testing.port']}

or just use a different key:

${testingPort}

---

_{¹Yes, this is a simplification of what really happens. It may also look for a predicate getter named isPort, or try Map#get("port").}