Servlets Basics QuizS2C Home « Servlets Basics Quiz
The questions in this Java Servlets quiz are on the topics covered in the Servlet Basics section of the site. The table below lists the lessons, a description of the lesson content and the quiz question number range.
Lesson Summary
Click on a lesson in the table to go to that lesson for a refresher on the topics for that lesson.
| Servlets Basics Lessons | Description | Question Range |
|---|---|---|
| Lesson 1 - Introduction to Servlets | In this lesson we download the tools necessary for setting up our environment to begin coding using servlets. | |
| Lesson 2 - What is HTTP? | This lesson is about the HTTP protocol, HTTP request/response mechanism, HTTP methods and HTTP response codes. | 1 - 8 |
| Lesson 3 - Java EE 5 & Servlets | In this lesson we learn about the Java EE 5 Platform and how servlets fit into the architecture. | 9 - 19 |
| Lesson 4 - Servlet Overview | In this lesson we start our in depth investigation of servlets by looking at the java interfaces and classes we need to create our own servlets. | 20 - 24 |
| Lesson 5 - The Servlet Lifecycle | In this lesson we look at the servlet lifecycle, from the loading and instantiation of a servlet to its eventual destruction. | 25 - 31 |
| Lesson 6 - Our First Servlet | In this lesson we create our first servlet and look at the processes involved. | 32 - 37 |
| Lesson 7 - ServletConfig & ServletContext | In this lesson we look at the conditional statements available in java. | 38 - 44 |
| Lesson 8 - Request & Response | In this lesson we look in much more detail at requests and responses. | 45 - 51 |
Servlets Quiz
The quiz below tests your knowledge of the material learnt in the Servlets Basics section of the site.
Question 2 : Which other protocols are responsible for getting HTTP requests and responses to and from the server?
- HTTP sits on top of TCP/IP, which are the protocols responsible for transferring data correctly and resolving internet connections.
Question 3 : HTTP requests and responses are always made up of three parts?
- This isn't always the case as in many HTTP methods the body is optional and so HTTP requests and responses can be made up of only two parts.
Question 4 : Which is the only HTTP method that is neither idempotent or safe?
- The <code>POST</code> HTTP method is neither idempotent or safe.
Question 5 : Which of the HTTP method is generally used by engineers rather than programmers?
- The <code>TRACE</code> HTTP method is generally used by engineers for debugging connection pathways.
Question 6 : What do HTTP response codes starting with a 3 generically indicate
- HTTP response codes starting with a 3 generically indicate some sort of redirection.
Question 7 : Which is the other inherently unsafe HTTP method apart from
DELETE and POST? - The <code>PUT</code> HTTP method is inherently unsafe as each time the operation is used it may have different effects.
Question 8 : We would use the
GET HTTP method to put sensitive data into the HTTP request body - The <code>GET</code> HTTP method appends all data to the URI. For sensitive data we would use the <code>POST</code> HTTP method which hides all data in the request body.
Question 9 : What are Servlets and JSPs defined as in the Java EE5 specification?
- Servlets and JSPs defined are as web components in the Java EE5 specification
Question 10 : How are servlets invoked?
- Servlets are invoked from a web container.
Question 11 : A web container stores all our EJBs, JSPs and servlets?
- A web container stores web components which are JSPs and servlets. An EJB container stores EJBs.
Question 12 : Which method of a servlet does a container invoke?
- A container will invoke the <code>service()</code> method of a servlet.
Question 13 : What does the
doGet() method of a servlet generate? - The <code>doGet()</code> method of a servlet generates dynamic page content to be passed back to the container via the HttpServletResponse object.
Question 14 : The container creates the HTTP response object
- The container creates the HttpServletResponse object not the HTTP response object.
Question 15 : What is the purpose of the MVC pattern?
- The MVC pattern reduces complexity by separating development into three distinct areas of concern.
Question 16 : In a three tier architecture which tier maps to the Controller area of the MVC pattern?
- In a three tier architecture the Application tier maps to the Controller area of the MVC pattern.
Question 17 : Which part of the MVC pattern maps to the Data tier in a three tier architecture?
- In a three tier architecture the Model maps to the Data tier.
Question 18 : What informs the View of changes in state?
- The Model informs the View of changes in state.
Question 19 : Where are user actions processed?
- User actions are processed by the Controller.
Question 20 : What type of requests can servlets respond to?
- Servlets can respond to any types of request, but are commonly used to extend applications hosted by web servers using a web container such as Tomcat.
Question 21 : We cannot implement the
javax.servlet.Servlet interface directly? - We can implement the <code>javax.servlet.Servlet</code> interface directly, although it's unlikely we would do so.
Question 22 : The
javax.servlet.GenericServlet class is a concrete implementation of the javax.servlet.Servlet interface? - The <code>javax.servlet.GenericServlet</code> class is abstract, so we need to extend this class to override the abstract <code>service()</code> method.
Question 23 : When using the
javax.servlet.http.HttpServlet class there is no need to override one of the service() methods? - This is true as there is no need to override either of the <code>service()</code> methods.
Question 24 : How are the
doXXX() methods of the javax.servlet.http.HttpServlet class invoked? - The <code>doXXX()</code> methods of the <code>javax.servlet.http.HttpServlet</code> class are invoked via the protected <code>service()</code> method.
Question 25 : What is the first stage in the servlet life cycle?
- The first stage in the servlet life cycle is when application class loader is used to load the servlet into the container
Question 26 : How many servlet lifecycle methods are there?
- there are three servlet lifecycle methods, these being <code>init()</code>, <code>service()</code> and <code>destroy()</code>.
Question 27 : Which of these lifecycle stage comes first, initialisation or instantiation?
- The container has to instantiate a servlet before we initialise it.
Question 28 : How many stages are there in the servlet lifecycle?
- There are five stages in the servlet lifecycle, these being class loading, instantiation, initialisation, servicing and destruction.
Question 29 : Servlets get loaded by the container on server statup?
- Servlets are lazily initialised and get loaded by the container when required unless instructed to within the DD using the <code>load-on-startup</code> sub-element of the <code>servlet</code> top-level element.
Question 30 : Each servlet gets one of which of the following objects?
- Each servlet gets a <code>ServletConfig</code> object.
Question 31 : The destroy() lifecycle method will always run for a servlet?
- If a servlet has failed during the initialisation stage of the lifecycle, then no servlet exists to be destroyed as the resources were not configuered correctly and hence the <code>destroy()</code> method doesn't get invoked.
Question 32 : What is the recommended method of deploying into Tomcat??
- The recommended method of deploying into Tomcat is by using a WAR file.
Question 33 : Where in Tomcat would we put static and dynamic view components we want a client to access directly?
- Files within <code>WEB-INF</code> folder are hidden and the <code>lib</code> folder is for JARS, so we would put viewable content within our project folder.
Question 34 : Which servlet object is accessible when directly implementing the
Servlet interface? - Both the <code>ServletConfig</code> and <code>ServletContext</code> objects are available after the <code>init()</code> lifecycle method has run regardless of implementation.
Question 35 : Which top-level DD element is used in conjunction with the
<servlet-mapping> element? - The <code>servlet</code> element is used in conjunction with the <code>servlet-mapping</code> element.
Question 36 : The
<servlet> top-level DD element is mandatory? - All top-level DD elements are optional.
Question 37 : When coding the
<servlet> top-level DD element, the <servlet-class> or <jsp-file> sub-level DD element is mandatory - When coding the <code>servlet</code> top-level DD element, either the <code>servlet-class</code> or <code>jsp-file</code> sub-level DD element is mandatory.
Question 38 : Which of these methods of
GenericServlet should you override for initialisation within a servlet? - You should override the <code>init()</code> method of the <code>GenericServlet</code> class, which is delegated to from the <code>init(ServletConfig servletConfig)</code> method for initialisation within a servlet.
Question 39 : Within which element within the DD do we place initialisation parameters for a servlet?
- Initialisation parameters for a servlet are placed within sub-elements of the <code>init-param</code> element.
Question 40 : You get one
ServletConfig object per web application? - You get one <code><ServletConfig></code> object for each servlet (and there can be many) within a web application.
Question 41 : Within which element within the DD do we place initialisation parameters for a web application?
- Initialisation parameters for a web application are placed within sub-elements of the <code>context-param</code> element.
Question 42 : You get one
ServletContext object per web application? - You get one <code><ServletContext></code> object for the entire web application.
Question 43 : You can have mulitple
context-param elements within the DD? - Yes you can have mulitple <code><context-param></code> elements within the DD.
Question 44 : The
context-param element is a sub-element of the servlet element? - The <code>context-param</code> is a top-level element and not part of the <code>servlet</code> element.
Question 45 : How are
ServletRequest and ServletResponse objects created? - <code>ServletRequest</code> and <code>ServletResponse</code> objects are created by the container.
Question 46 : Which class does
HttpServlet extend? - <code>HttpServlet</code> extends <code>GenericServlet</code>, the other answers are all interfaces.
Question 47 : Which HTTP protocol specific
service() method delegates servicing to one of the HTTP doXXX() methods? - The protected <code>service()</code> method delegates servicing to one of the HTTP doXXX() methods.
Question 48 : What does the container guarantee with regards to multithreading?
- With regards to multithreading the container guarantees that every request is started in a new thread.
Question 49 : The
HttpServletRequest and HttpServletResponse objects are part of the the javax.servlet package? - The <code>HttpServletRequest</code> and <code>HttpServletResponse</code> objects are protocol specific and so have their own package called <code>javax.servlet.http</code>.
Question 50 : Which HTTP doXXX() method is the default for delegation from the
service() method? - The <code>doGet()</code> method is the default for delegation from the <code>service()</code> method.
Question 51 :
HttpServletRequest implements ServletRequest? - <code>HttpServletRequest</code> extends <code>ServletRequest</code> as both are interfaces and you cannot implement another interface.
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What's Next?
The next quiz on Servlets is all about the lessons in the servlets intermediate section.
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