public void setPasswordParam(String passwordParam) {
        this.passwordParam = passwordParam;
    }
Sets the request parameter name to look for when acquiring the password.  Unless overridden by calling this
method, the default is <code>password</code>.

@param passwordParam the name of the request param to check for acquiring the password.
web/src/main/java/org/apache/shiro/web/filter/authc/FormAuthenticationFilter.java