conf\web.xml's JspServlet init parameters include 'checkInterval', whose value
is explained as follows:
  If development is false and checkInterval is greater than zero, background
compilations are enabled.

If I add the following parameters one would think the background compilations
would be disabled (the value is not greater than zero).

        <init-param>
            <param-name>checkInterval</param-name>
            <param-value>0</param-value>
        </init-param>
        <init-param>
            <param-name>development</param-name>
            <param-value>false</param-value>
        </init-param>

However, the value is changed to 300 and the following warning is outputted:
Dec 30, 2006 7:13:57 PM org.apache.jasper.EmbeddedServletOptions <init>
WARNING: Warning: Invalid value for the initParam checkInterval. Will use the
default value of "300" seconds

According to the comment in web.xml "0" was a valid value. Either the comment or
the validity check is wrong. Or my understanding of them.