final study material 9/6 -1


1.     Struts was first developed --B
 A.
in an online exchange between several open source developers
 B.
over a long holiday weekend
 C.
as a commercial package
2.     The reset method on an ActionForm D
 A.
Sets all properties to their initial value
 B.
Sets all properties to null
 C.
Repopulates all properties from the request parameters
 D.
None of the above
3.     Each Struts Action element is uniquely identified by its----D
 A.
Input attribute
 B.
Name attribute
 C.
Page attribute
 D.
Path attribute
4.     The name of the Application Resources file is set by the servlet init-param named--A
 A.
application
 B.
resources
 C.
ApplicationResources
 D.
messages
5.     The validating init-param of the ActionServlet is used to---B
 A.
Bypass calls to the ActionForm validate method
 B.
Bypass validation of the Struts configuration file
 C.
Generate an error message if an unknown message key is used
6.     To specify an ActionMapping to use when a request doesn't match any other mapping, you can ---C
 A.
Use an asterisk for the path property
 B.
Set the "default" property of the mapping to "true"
 C.
Set the "unknown" property of the mapping to "true"
 D.
Set the "missing" init-param of the ActionServlet to the mapping's path
7.     If you have created a custom ActionMapping subclass with the property "service", you can initialize the value to "selectRecord" using ----B
 A.
<init-property name="service" value="selectRecord"/>
 B.
<set-property property="service" value="selectRecord"/>
 C.
<put-field key="service" content="selectRecord"/>
8.     In Struts 1.1, you can change how Struts populates a form by---B
 A.
Overriding the populate method of the ActionForm
 B.
Overriding the processPopulate method of the Request Processor
 C.
Overriding the populateBean method of the ActionMapping
9.     The <bean:write> tag is:----C
 A.
Always converts HTML markup to entity equivalents, like &lt;
 B.
Never converts HTML markup to entity equivalents
 C.
Converts markup when filter=true
 D.
Converts markup when markup=false
10.   To prevent possible security issues with the <html:password> tag, you should--B
 A.
Call the reset method if validation fails
 B.
Set the tag's redisplay property to false
 C.
Set the tag's reset property to false
 D.
Use a plain html tag instead
11.   To localize Tiles, you can ---A
 A.
Create separate configuration files for each locale
 B.
Specify an locale for a definition
 C.
Either A or B
12.   To localize Validator forms, you can---B
 A.
Create separate configuration files for each locale
 B.
Specify a locale for a form-set
 C.
Either A or B
13.   From a MVC perspective, Struts provides the---C
 A.
Model
 B.
View
 C.
Controller
1. If you need to use a stored procedure with output parameters, which of the following statement type should be used to call the procedure? ---C
 A.
Statement
 B.
PreparedStatement
 C.
CallableStatement

2. Which of the following will not cause a JDBC driver to be loaded and registered with the DriverManager? ---D
 A.
Class.forName(driverString);
 B.
new DriverClass();
 C.
Include driver name in jdbc.drivers system property
 D.
None of the above

3. From which object do you ask for DatabaseMetaData? ---A
 A.
Connection
 B.
ResultSet
 C.
DriverManager
 D.
Driver

4. SQLWarnings from multiple Statement method calls (like executeUpdate) will build up until you ask for them all with getWarnings and getNextWarning. ---B
 A.
True
 B.
False

5. If one intends to work with a ResultSet, which of these PreparedStatement methods will not work? ---C
 A.
execute()
 B.
executeQuery()
 C.
executeUpdate()

6. Can a ResultSet be reliably returned from a method that creates a Statement and executes a query? ---B
 A.
Yes
 B.
No

7. How can I use JDBC to create a database?---B
 A.
Include create=true at end of JDBC URL
 B.
Execute "CREATE DATABASE jGuru" SQL statement
 C.
Execute "STRSQL" and "CREATE COLLECTION jGuru" SQL statements
 D.
Database creation is DBMS specific

8. Which character is used to represent an input parameter in a CallableStatement? -C
 A.
%
 B.
*
 C.
?
 D.
#


9. Which one of the following will not get the data from the first column of ResultSet rs, returned from executing the following SQL statement: SELECT name, rank, serialNo FROM employee. --A
 A.
rs.getString(0);
 B.
rs.getString("name");
 C.
rs.getString(1);

10. Which of the following can you do with a JDBC 2.0 database driver that you cannot with a JDBC 1.x driver? ---D
 A.
Batch multiple statements, to be sent to the database together
 B.
Scroll through result sets bi-directionally
 C.
Work with SQL3 data types directly
 D.
All of the above

11. Which class contains the transaction control methods setAutoCommit, commit, and rollback? --A
 A.
Connection
 B.
Statement
 C.
ResultSet

1. If you need to use a stored procedure with output parameters, which of the following statement type should be used to call the procedure?

 A.
Statement


 B.
PreparedStatement


 C.
CallableStatement


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Answer (C): Output parameters are only available when working with a CallableStatement. See Store d Procedures





2. Which of the following will not cause a JDBC driver to be loaded and registered with the DriverManager?

 A.
Class.forName(driverString);


 B.
new DriverClass();


 C.
Include driver name in jdbc.drivers system property


 D.
None of the above


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Answer (D): A, B, and C will all cause the JDBC driver to be loaded and registerd with the DriverManager. See Conn ecting to the Database






3. From which object do you ask for DatabaseMetaData?
 A.
Connection
 B.
ResultSet
 C.
DriverManager
 D.
Driver


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Answer (A): The getMetaData of Connection allows you to get the database meta data. See Dat abase Metadata.

4. SQLWarnings from multiple Statement method calls (like executeUpdate) will build up until you ask for them all with getWarnings and getNextWarning.

 A.
True


 B.
False


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Answer (B): Statements clear warnings automatically on the next execution. See SQL Warnings.






5. If one intends to work with a ResultSet, which of these PreparedStatement methods will not work?
 A.
execute()
 B.
executeQuery()
 C.
executeUpdate()

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Answer: (C) While execute returns a boolean, you can get multiple ResultSets through getResultSet. See Statements, ResultSets, and Interacting with a Database.
 
6. Can a ResultSet be reliably returned from a method that creates a Statement and executes a query?
 A.
Yes
 B.
No

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Answer (B): No, closing the Statement, will close the result set.

7. How can I use JDBC to create a database?
 A.
Include create=true at end of JDBC URL

 B.
Execute "CREATE DATABASE jGuru" SQL statement

 C.
Execute "STRSQL" and "CREATE COLLECTION jGuru" SQL statements

 D.
Database creation is DBMS specific

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Answer (B): Execute "CREATE DATABASE jGuru" SQL statement






 
8. Which character is used to represent an input parameter in a CallableStatement?
 A.
%
 B.
*
 C.
?
 D.
#

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Answer (C): It is the ? character. See Par ameter INs and OUTs.
 
9. Which one of the following will not get the data from the first column of ResultSet rs, returned from executing the following SQL statement: SELECT name, rank, serialNo FROM employee.
 A.
rs.getString(0);
 B.
rs.getString("name");
 C.
rs.getString(1);

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Answer (A): Column numbers start at 1, not 0. See Data base Queries.

10. Which of the following can you do with a JDBC 2.0 database driver that you cannot with a JDBC 1.x driver?
 A.
Batch multiple statements, to be sent to the database together
 B.
Scroll through result sets bi-directionally
 C.
Work with SQL3 data types directly
 D.
All of the above

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Answer (D): All of these are new capabilities supported only when using a JDBC 2.0 driver and a database that supports them. See Batch Update Facility, Scrol lable Result Sets, and LOBs.
 
11. Which class contains the transaction control methods setAutoCommit, commit, and rollback?
 A.
Connection
 B.
Statement
 C.
ResultSet

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Answer (A): Transactions are controlled at the Connection level. See: Trans actions.

1. Choose the statement that best describes the relationship between JSP and servlets:
 A.
Servlets are built on JSP semantics and all servlets are compiled to JSP pages for runtime usage.
 B.
JSP and servlets are unrelated technologies.
 C.
Servlets and JSP are competing technologies for handling web requests. Servlets are being superseded by JSP, which is preferred. The two technologies are not useful in combination.
 D.
JSPs are built on servlet semantics and all JSPs are compiled to servlets for runtime usage.


1.

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Every JavaServer Pages (JSP) source page is compiled into a servlet before it is executed at runtime.

2. What is a benefit of using JavaBeans to separate business logic from presentation markup within the JSP environment?
 A.
It allows the JSP to access middleware.
 B.
It creates a cleaner role separation between the web-production team and the software development team, so that the web-production team can focus on presentation markup, while the software team can focus on building reusable software components for helping to generate dynamic displays.
 C.
It provides a dynamic markup environment, such that JavaBeans are integrated seamlessly with the template presentation content, in order to create the dynamic display for the client.
 D.
It provides the developer with full access to the Java 2 Platform Enterprise Edition (J2EE), which is unavailable from outside the JavaBean environment.

2.

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When large amounts of Java scriptlet code are mixed with HTML markup within a JSP page, not only do readability and reuse suffer, but often bugs are introduced as web-production team members, who may not be familiar with Java programming, need to modify the accompanying markup. Additionally, dependencies now exist among various teams competing for the same file, making the development process less efficient.

3. Why use RequestDispatcher to forward a request to another resource, instead of using a sendRedirect?
 A.
Redirects are no longer supported in the current servlet API.
 B.
Redirects are not a cross-platform portable mechanism.
 C.
The RequestDispatcher does not use the reflection API.
 D.
The RequestDispatcher does not require a round trip to the client, and thus is more efficient and allows the server to maintain request state.


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Doing an HTTP redirect requires a round-trip to the client. If this is not required, and the only desire is to forward the request to another resource, then this can be much more efficiently accomplished with the RequestDispatcher. Additionally, when using the dispatcher the state of the request object is maintained between resources, which will not be the case with the HTTP redirect.

4. What alternatives exist to embedding Java code directly within the HTML markup of your JSP page?
 A.
Moving the code into your session manager.
 B.
Moving the code into scriptlets.
 C.
Moving the code into JavaBeans and servlets.
 D.
Moving the code into a transaction manager.

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Business logic is better contained in a JavaBean or a servlet that is owned by a software developer. When lots of Java code is embedded directly within the JSP page as scriptlets, the "cut-and-paste" mentality tends to prevail when it comes to code reuse.

5. What type of scriptlet code is better-suited to being factored forward into a servlet?
 A.
Code that deals with logic that is common across requests.
 B.
Code that deals with logic that is vendor specific.
 C.
Code that deals with logic that relates to database access.
 D.
Code that deals with logic that relates to client scope.

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Since the servlet is the initial contact point for each request, it is well-suited to handle logic that is common across multiple requests. A good example of this type of logic is an authentication check.

6. Choose the statement that best describes how to connect JSP pages and Enterprise JavaBeans (EJBs):
 A.
Lookup the EJBs from within a JSP, but use the EJBs from within a basic JavaBean.
 B.
Lookup and use the EJBs from a separate business delegate. The JavaBeans that work with JSP pages are clients to these business delegates and know nothing about EJB specifics.
 C.
Lookup and use the EJBs from within a JSP page, but only as remote references.
 D.
Lookup the EJBs from within a servlet, delegating usage to specific JSP pages.


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Using a business delegate reduces coupling between the presentation and business tiers. The presentation tier has no knowledge of the EJB implementation details, such as Java Naming and Directory InterfaceTM lookup.

7. Are custom tags available in JSP 1.0? If not, how else might you implement iteration from within a JSP?
 A.
Yes, but the only tags available relate to database access.
 B.
No. To iterate over a collection of values, one must use scriptlet code.
 C.
No, but there is a standard <iterate> tag that may be used.
 D.
Yes, but custom tags will not help developers create tags for use in iterating over a collection.


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Using Java scriptlets is the accepted method of doing iteration in JSP 1.0. In JSPTM 1.1, a custom tag may be used, which will hide the implementation details of the iteration code.

8. What is the initial contact point for handling a web request in a Page-Centric architecture?
 A.
A JSP page.
 B.
A JavaBean.
 C.
A servlet.
 D.
A session manager.

The term Page-Centric is used to describe an architecture where the initial contact point for the request is a JSP page. An example is shown visually below:

9. What is the difference between doing an include or a forward with a RequestDispatcher?
 A.
The forward method transfers control to the designated resource, while the include method invokes the designated resource, substitutes its output dynamically in the display, and returns control to the calling page.
 B.
The two methods provide the same functionality, but with different levels of persistence.
 C.
The forward method is deprecated as of JSP 1.1 and the include method should be used in order to substitute portions of a dynamic display at runtime.
 D.
The include method transfers control to a dynamic resource, while the forward method allows for dynamic substitution of another JPS pages output, returning control to the calling resource.


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When the forward method is used, the invoking resource does not regain control. Multiple include invocations can be made from the same resource, while the invoking resource maintains execution control.


10. What line of code below might be combined in the same JSP page with a validation guard (for example, <% bean.validationGuard(); %> ), in order to create an alternate flow of control for scenarios in which exceptions arise. The validationGaurd method might throw an exception, which should cause the flow of control to continue in another user-defined page (assume JSP 1.0).
 A.
<jsp:error page="errorPage.jsp" guard="true" />
 B.
<%@ page language="java" buffer="8k" %>
 C.
<jsp:useBean id="bean" class="examples.Bean" scope="request" />
 D.
<%@ page language="java" errorPage="errorPage.jsp" buffer="8k" %>

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Error pages are invoked when there is an uncaught exception from within a particular page. In this case, we mention that the validationGaurd() method might throw an exception. If this exception is not caught within the page, then we vector control to errorPage, as stipulated in the attribute of the given page directive.

1. When a JSP page is compiled, what is it turned into?
 A.
Applet
 B.
Servlet
 C.
Application
 D.
Mailet