Which allows embedding Java code directly into the HTML code?
- Applet
- JSP
- JavaBean
- Servlet
JavaServer Pages (JSP) allows the embedding of Java code directly into HTML code, facilitating the creation of dynamic web pages with server-side logic.
If a servlet generates dynamic content and you want to ensure it's not cached, which combination of response headers should be set?
- Cache-Control: no-store, Pragma: no-cache
- ETag, Cache-Control: no-cache
- Expires: 0, Cache-Control: must-revalidate
- Last-Modified, Cache-Control: private
To ensure dynamic content is not cached, the combination of Cache-Control: no-store and Pragma: no-cache headers should be set in the HttpServletResponse.
What is the key difference in the way servlets and JSPs are compiled?
- Both servlets and JSPs are compiled just-in-time (JIT)
- Both servlets and JSPs are interpreted
- JSPs are precompiled
- Servlets are precompiled
Servlets are precompiled into bytecode during the build process, while JSPs are typically compiled into servlets at runtime. This compilation difference contributes to the performance variations between servlets and JSPs.
Which method of the RequestDispatcher interface is used to forward a request from a servlet to another resource?
- dispatch()
- forward()
- forwardRequest()
- redirect()
The forward() method of the RequestDispatcher interface is used to forward a request from a servlet to another resource within the same server.
If an HTTP servlet receives a request with an invalid session token, what should it do next?
- Generate a new session token and proceed
- Ignore the request
- Redirect to the login page
- Send an HTTP 401 Unauthorized response
In the case of an invalid session token, it's a security best practice to send an HTTP 401 Unauthorized response to prompt reauthentication.
Can a servlet access the ServletConfig of another servlet?
- It depends on the web container being used.
- No
- Only if both servlets belong to the same package.
- Yes
No, a servlet cannot directly access the ServletConfig of another servlet. Each servlet has its own ServletConfig associated with it.
What differentiates ServletContext and ServletConfig in terms of initialization parameters?
- ServletConfig can be used for application-wide parameters, while ServletContext is specific to a servlet.
- ServletConfig is used for application-wide parameters.
- ServletContext can be used for application-wide parameters, while ServletConfig is specific to a servlet.
- ServletContext is used for servlet-specific parameters.
The ServletContext is intended for parameters that are shared across the entire application, whereas ServletConfig is specific to a particular servlet.
The servlet is removed from service by the servlet container via the __________ method.
- destroy()
- doDelete()
- init()
- service()
The destroy() method is called when the servlet is being removed from service by the servlet container. It allows the servlet to release resources before it's taken out of operation.
Which method of the HttpServlet class is used to handle HTTP GET requests?
- doGet()
- doPost()
- init()
- service()
The doGet() method of the HttpServlet class is specifically designed to handle HTTP GET requests.
How does the servlet container handle HTTP headers when using RequestDispatcher's forward method?
- HTTP headers are discarded
- HTTP headers are duplicated
- HTTP headers are modified
- HTTP headers are preserved
When using RequestDispatcher's forward method, the servlet container discards the original response headers, allowing the forwarded resource to generate a new set of headers. This is important to avoid conflicts and ensure that the forwarded resource has control over the headers.
In what scenario is it more appropriate to use RequestDispatcher over HttpServletResponse's sendRedirect?
- When maintaining the original URL is crucial
- When preserving client-side state is necessary
- When the resource is on a different server
- When the resource is on the same server
RequestDispatcher is more appropriate when you need to forward a request internally within the server, maintaining the original URL. This is especially important when you want to keep the original URL in the browser's address bar.
What is the significance of the path attribute in a cookie?
- It defines the cookie's value
- It indicates the cookie's path
- It sets the cookie's domain
- It specifies the cookie's name
The path attribute in a cookie is significant as it indicates the URL path for which the cookie is valid. The client sends the cookie only if the path matches the requested URL.