java - printing "" instead of "null" in jasper JSP (tomcat) -

i'm migrating application weblogic tomcat (8.0.35). in weblogic used "printnull = false" option means when var null, <%=var%> print empty string (instead of "null", specification require), there no equivalent option jasper jsp.

what can done achieve behavior?

p.s. changing jsp files not option, there many of them.

i ended patching jasper.jar, method: public void visit(node.expression n) @ generator.java, resulted .java file of jsp prints empty string in case of nulls.

this not great solution, , wanted avoid, looks there no such option.