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Categories >> Software >> Java Related >> Java J2EE >> Struts


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what is request processor class ?
 Question Submitted By :: Struts
I also faced this Question!!     Answer Posted By  
# 1
Request processor is a class which is under the controller
layer.this class is uesd to acces the client request from
the actionServlet process the req and then dispatches to the
next layer i.e Model(Action class).Finally Action class
calls the execute() and and it return the ActionForward to
Is This Answer Correct ?    30 Yes 9 No
# 2
In struts the Action servlet serves as a front controller
where it receives all the request from the client. All those
requests are delegated to the RequestProcessor class. In
this class process method will be invoked with httprequest
and response objects.
This method has so many method calls to populate the forms,
associating the request to the proper mapping etc.

For more details
Is This Answer Correct ?    12 Yes 5 No
# 3
Class is the actual place where the request processing
takes place in a Struts controller environment.

When the request object first reaches the actionservlet
class then it invokes the process method of the underlying
RequestProcessor Class.

This process method then looks into the struts-config.xml
file and tries to locate the name of the action that has
come with the request.Once it identifies the action in the
xml file it continues the rest of the steps needed for
request processing.

processor has most of the following responsibilities:

1.Determine path,
2.Handle Locale,
3.Process content and encoding type,
4.Process cache headers
5.Pre Processing hook
6.Pre-processing hook,
7.Determine mapping,
8.Determine roles,
9.Process and validate actionForm,
10.Return a response
Is This Answer Correct ?    8 Yes 1 No
# 4
RequestProcessor is an helper class to
Actually ActionServlet is dummy all the work which is done
with the help of RequestProcessor using the method process()

ActionServlet is declarativly defined in web.xml and
RequstProcessor is an predefined class.
we can create our own RequstProcessor class
Is This Answer Correct ?    7 Yes 3 No
# 5
in RequestProcessor we have process()
this process method used to process the enduser request
and it is called by the action servlet doget()or dopost()
method by default it work one way
if u want change the flow of the application before
invoking our action classes we to implent the
requestprocess class
Is This Answer Correct ?    4 Yes 1 No
# 6
1.Request processor class contains th code of form
processing logic. follows the chain of responsibility.
3.action servlet sends the request to the RP.
4.RP binds the values to the form bean by calling setters
and dispath the request to the following according the
a.errors handlers
Is This Answer Correct ?    6 Yes 6 No
# 7
We say that ActionServlet is the backbone of the struts application but actually it just receives the request and invoke RequestProcessor process() method and this RequestProcessor processes all aspects of the request.
If the above is true , then RequestProcessor should be the heart of struts application or do we consider {ActionServlet + Requestprocessor} as a single unit when we say "ActionServlet is the backbone of the struts application".

1. ActionServlet receives the request.
2. The doPost() or doGet() methods receive a request and invoke the process() method.

3. The process() method gets the current RequestProcessor and invokes the RequestProcessor. process() method

4.The RequestProcessor.process() method is where the current request is actually serviced. This method retrieves, from the struts-config.xml file, the <action> element that matches the path submitted on the request. It does this by matching the path passed in the <html:form /> tag's action element to the <action> element with the same path value

5. When the RequestProcessor.process() method has a matching <action>, it looks for a <form-bean> entry that has a name attribute that matches the <action> element's name attribute.

6. When the RequestProcessor.process() method knows the fully qualified name of the FormBean, it creates or retrieves a pooled instance of the ActionForm named by the <form-bean> element's type attribute and populates its data members with the values submitted on the request

7. After the ActionForm's data members are populated, the RequestProcessor.process() method calls the ActionForm.validate() method, which checks the validity of the submitted values.

8. At this point, the RequestProcessor.process() method knows all that it needs to know and it is time to actually service the request. It does this by retrieving the fully qualified name of the Action class from the <action> element's type attribute, creating or retrieving the named class, and calling the Action.execute() method

9. When the Action class returns from its processing, its execute() method returns an ActionForward object that is used to determine the target of this transaction. The RequestProcessor.process() method resumes control, and the request is then forwarded to the determined target.

10. At this point, the ActionServlet instance has completed its processing for this request and is ready to service future requests.

Most of the controlling work is done by RequestProcessor and still we say ActionServlet is the backbone ?
Is This Answer Correct ?    0 Yes 0 No
# 8
Whenever client send the request to sever is check is there web. XML file.And the read the contents in web. XML file and store into JVM's memory.
After ur using <load-on-startup> sever is created ActionServlet Object.In second second init()method and the reads the contents stored in JVM's memory.
Now sever is created Request and Response Object's and hadover to ActionServelt Service().
Is This Answer Correct ?    0 Yes 3 No
# 9
Is This Answer Correct ?    1 Yes 4 No
# 10
Is This Answer Correct ?    2 Yes 34 No

Other Struts Interview Questions
  Question Asked @ Answers
1.Which of the following can be performed using interceptors by the developer? 1. Provide pre-processing logic before invoking the action 2. Interact with the action and set the request parameter on the action 3. Provide post-processing logic after invoking the action 4. Modify the result 1, 2, 3 2, 3, 4 1, 2, 4 1, 2, 3, 4 2.Interceptors can be used for which of the following tasks? 1. Checking security and bottleneck 2. Tracing the log 3. Validating user input 4. Uploading file 1, 2, 3 2, 3, 4 1, 2, 4 1, 2, 3, 4 3.The ValueStack is made up of which of the following objects? 1. Temporary Objects 2. Model Object 3. Action Object 4. Permanent Object 1, 2, 3 2, 3, 4 1, 2, 4 1, 2, 3, 4 4.Which of the following statements are correct? Apache Struts is a Java based framework that separates the application logic from the presentation layer. Action is based on pull-MVC framework which means that the data to be displayed is pulled from the action class which is a POJO class acting as a model in the Web application. OGNL is a powerful expression language that allows you to refer and manipulate the data present on the ValueStack. Declarative architecture enables you to integrate the different components present in the Web application either using XML files or Annotations. 5.Which of the following are the examples of helpers? 1. Action Interface 2. ActionSupport Class 3. ActionImplement Interface 1, 2 2, 3 1, 3 1, 2, 3 6.The Struts 2 filter performs which of the following tasks? 1. Installation of the Action class 2. Execution of the method specified in the configuration file 3. Reading of the control string 1, 2 2, 3 1, 3 1, 2, 3 7.Which of the following value for the debug parameter displays an OGNL console to test OGNL expressions against the value stack? xml console command All of the above. 8.Which of the following are correct statements? The execute () method of the action class defines business logic implementations. ActionSupport class adds useful utilities to the class that extends it. Set of Interceptors are grouped into a stack known as Interceptor Stack. All of the above. 9.Which of the following annotation helps to set the path of the action URL? It is placed before the action class and it applies to all actions defined in the class, even if the fully qualified URLs are not supplied. @Namespace @Result @Results @ParentPackage 10.Which of the following statements are correct related to OGNL and Annotations? OGNL is an expression and binding language that is used for getting and setting the properties of the Java objects. Annotations acts as an alternative to HTML and Java properties configuration file. Action Annotations are available when the framework scans the classpath for action classes. Lifecycle callback annotations are invoked at any time during the processing of an action. 11.Which of the following are the features of the new unified Expression Language? Deferred evaluation of expression Support expressions that can set values and invoke methods Provides a pluggable API for resolving expressions All of the above. 12.By introducing the new feature by JSF, improvements have been made in which of the following areas? Set of standard converter messages Addition of requiredMessage, converterMessage, and validatorMessage attribute for input components. Displaying the error message using the input component name with the help of label attribute added to the input components All of the above. 13.Which of the following statements are correct about the 'label' attribute? In JSF 2.1, the label attribute have been introduced with the input components. The label attribute can accept literal or value expressions. The Literal or value expressions accepted by label attribute is prefixed before the components error message. All of the above. 14.Which of the following statements are correct? EL allows developers to use simple expressions to dynamically access data from JavaBeans components. EL supports only deferred evaluation. A value expression can either yield a value or set a value and can be used for both read and write. In immediate evaluation, the expression is evaluated immediately. 15.Which of the following statements are correct? Method expression invokes as arbitrary private method of an arbitrary object by passing a specified set of parameters and returning results from the calling method. JSTL is a part of Java EE 5 platform. JSF 1.2 includes a set of messages for standard converters. The requiredMessage, converterMessage, or the validatorMessage attribute of the input components are used to provide custom error messages. Wipro 2
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