What 312-96 Questions and Answers feature?

To remove the HttpSession object and its values from the client’s system, the developer should use the invalidate() method. This method is called on the HttpSession object itself and marks the session for deletion, removing all its attributes and invalidating the session on the server side. Once a session is invalidated, any new request from the client does not associate with the old session and will typically result in a new session being created if required.

Here’s a step-by-step explanation of how the invalidate() method works:

• The developer retrieves the HttpSession object from the HttpServletRequest object using the getSession() method.
• The developer calls the invalidate() method on the retrieved HttpSession object.
• The server invalidates the session, which means it is no longer recognized and any subsequent requests will not be associated with it.
• All objects bound to the session are removed and available for garbage collection.
• The client’s next request will not have a valid session, and the server will treat it as a new session if necessary.

References:The information provided here is aligned with the EC-Council’s Certified Application Security Engineer (CASE) JAVA guidelines and best practices for secure session management. For more detailed information, please refer to the EC-Council’s CASE JAVA official study guides and training materials12.

To ensure that cookies are transmitted securely over an encrypted channel, such as HTTPS, the web.xml file should include the secure attribute set to true within the cookie-config element of the session-config. This is not directly related to the connector element but rather to the session configuration for cookies.

Here’s how it should be configured:

XML

true

true

AI-generated code. Review and use carefully. More info on FAQ.

This configuration ensures that cookies are only sent to the client when a secure channel is used.

References:The information is based on standard practices for securing cookies in Java web applications as per Servlet 3.0 specification and the OWASP guidelines. For more detailed information, you can refer to the EC-Council’s Certified Application Security Engineer (CASE) JAVA documentation and study guides1234.

To prevent the Tomcat server from serving index pages in the absence of welcome files, the  configuration for the DefaultServlet needs to be modified. The listings parameter controls whether directory listings are shown. When set to false, it ensures that directory listings are not provided, which includes not serving index pages when welcome files are absent.

Here’s the breakdown of the configuration:

• default: This specifies the name of the servlet.
• org.apache.catalina.servlets.DefaultServlet: This indicates the servlet class that is being configured.
• : This tag is used to define initialization parameters for the servlet.
• listings: The listings parameter name is used to control the display of directory listings.
• false: Setting this value to false disables the directory listings.
• 1: This indicates the servlet should be loaded at startup.

The correct configuration to solve Oliver’s problem is:

XML

default

org.apache.catalina.servlets.DefaultServlet

listings

false

1

AI-generated code. Review and use carefully. More info on FAQ.

This configuration will ensure that if a welcome file is not present, the server will not default to serving an index page, thus addressing the security concern.

References:For further details on Tomcat server configuration, please refer to the official Apache Tomcat documentation and configuration guides which provide comprehensive instructions on server setup and security best practices12. These resources are essential for any web server admin like Oliver to configure and secure their Tomcat server effectively.