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From: bugzilla@apache.org
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Subject: DO NOT REPLY [Bug 3799] New:  - 
    Setting null cookie value throws exception
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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=3799

Setting null cookie value throws exception

           Summary: Setting null cookie value throws exception
           Product: Tomcat 4
           Version: 4.0 Final
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Critical
          Priority: Other
         Component: Catalina
        AssignedTo: tomcat-dev@jakarta.apache.org
        ReportedBy: bill@jivesoftware.com


The standard way to delete a cookie is to set the cookie's value to null then 
re-add the cookie to the response:

<%
    // Cookie test
    Cookie cookie = new Cookie("foo",null);
    // add cookie
    response.addCookie(cookie);
%>

This results in a NullPointerException because Tomcat tries to URLEncode a null 
value. The ability to delete a cookie is a critical necessity as it will 
prevent most webapps that use cookies from working correctly.