Understanding Mvc & Orm

Front 1

True or False? Hibernate allows you to develop persistent classes following common Java idiom-including association, inheritance, polymorphism, composition, and the Java collections framework.

Back 1

Ans:

True!

Front 2

What are the Instance states of persistent classes?

Back 2

Ans:

Transient - no association of data.

Persistent - association of data.

Detached - no longer associated with data after session close.

Front 3

What is the purpose of ORM?

Back 3

Ans:

ORM/Object-Relational Mapping. It is the automated persistence of objects in a Java application to the tables in a relational database.

Front 4

Is the SessionFactory a thread safe object?

Back 4

Ans:

Yes!

Front 5

What is Hibernate exactly?

Back 5

Ans:
Hibernate is a pure Java object-relational mapping and persistence framework that allows you to map plain old Java objects to relational database tables using XML configuration files.

Front 6

What are the core interfaces associated with the HIbernate framework?

Back 6

Ans:

1. Session Interface

2. SessionFactory Interface

3. Configuration Interface

4. Transaction Interface

5. Query & Criteria Interfaces

Front 7

How may the query cache become enabled? By setting Property name:-....

Back 7

Ans:

hibernate.cache.use_query_cache true/false

Front 8

Is Employee object available to access from the following statement?

-Employee emp = session.load(Employee.class);

session.close();

Back 8

Ans:

No

Front 9

How can you make a property be read from the database, but not modified in anyway?

Back 9

Ans:

By using the insert="false" and update="false" attributes

Front 10

Explain the difference between...

- Emp e = session.load(Emp.class);

- Emp e = session.createCriteria(Emp.class)

Back 10

Ans:

On session close session.load() Emp object unavailable to access.

Front 11

If you are not certain that a matching row exists in the database then, which method is the best?

Back 11

Ans:

Session.get()

Front 12

Does hibernate require persistent classes to implement Serializable?

Back 12

Ans:

Not Required

Front 13

How would one go by getting the Connection object from session?

Back 13

Ans:

session.connection()

Front 14

The SessionFactory in hibernate represents which level of cache?

Back 14

Ans:

2nd Level

Front 15

What should the Struts framework always should do?

Back 15

Ans:

Should always decouple the applicaiton from a specific model implementation.

Front 16

What are the pre-build Action classes in Struts?

Back 16

Ans: SLLAMDDIF

-Switch Action, Locale Action, LookupDispatch Action, Action, MappingDispatch Action, Download Action, Dispatch Action, Include Action, Forward Action.

Front 17

In Struts, what should always forwards or redirect to a resource (view) after completed?

Back 17

Ans:

Request Processor

Front 18

What is an instance of Action invoke by?

Back 18

Ans:

Request Processor

Front 19

Which logic tag is used for repetitive output generation?

Back 19

Ans:

logic:interate

Front 20

Application module selection is done by what in Struts?

Back 20

Ans:

Action Servlet

Front 21

Action Servlet, Request Processor, and Action classes are the components of what in Struts?

Back 21

Ans:

Controller

Front 22

What defines the availability of necessary Struts custom tag libraries in struts-config.xml file?

Back 22

Ans:

taglib

Front 23

What are the four performances by the Action Servlet and Request Processor?

Back 23

Ans:

1. Receiving the HTTPServletRequest

2. Populating JavaBean from the request parameters.

3. Provide extension points.

4. Content type issues handling.

Front 24

What is an ActionServlet?

Back 24

Ans:

It is the central component of the Struts Controller.

- It reads/loads the struts-config.xml into memory during the init()

- In the doGet() & doPost() methods, it intercepts HTTP request and handles it appropriately.

Front 25

What is an ActionForm?

Back 25

Ans:

Setters/Getters; It contains the data entered from the form (UI) on the client side. a.k.a: Form Bean

Front 26

What are the various ways of doing form validation?

Back 26

Ans:

1. JavaScript client-side validation
2. Struts Validator Framework
3. Override the validate method in the Struts form class & use Action Errors.

Front 27

What are the steps to integrating the Validator Framework with a Struts application?

Back 27

Ans:

1. Setup plugin in the struts.config.xml.
2. Set the location of MessageResources.properties in <message-resource> of struts config.xml.

3. In <action> under struts.config.xml set the validate=true and input=/.jsp file attributes

4. Extend ValidatorForm in the form class if one is used.

5. Edit the validation.xml to map the properties of the form bean to the definitions in the validator-rules.xml

6. Place the error messages in MessageResources.properties.

7. Place the <html:errors/> in the appropriate JSP set by the input attribute in Step 3.

Front 28

What is a DynaActionForm?

Back 28

Ans:

The DynaActionForm allow the developer to create a form on the fly. It uses less memory thus making it faster than an Actual Form being created.

Front 29

What is DynaValidatorForm?

Back 29

Ans:

It is a sub-class of DynaActionForm. It allows the DynaActionForm to perform initial validation with the Validation framework.