Minor Description
When an argument to a servlet consists of a quotation marks character, an exception saying "java.lang.IllegalArgumentException: Argument must not be null" will happen.
How to reproduce the defect:
I have narrowed down the failure with a small test case, which I run against a server that is exposing the 'servlet' application on default port. The server is a default server started by tests.support.Support_Jetty.