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CX-310-084 PDF DEMO:
QUESTION NO: 1
Given a JSP page:
The tag handler for n:recurse extends SimpleTagSupport.
Assuming an n:recurse tag can either contain an empty body or another n:recurse tag, which strategy allows the tag handler for n:recurse to output the nesting depth of the deepest n:recurse tag?
A. It is impossible to determine the deepest nesting depth because it is impossible for tag handlers that extend SimpleTagSupport to communicate with their parent and child tags.
B. Create a private non-static attribute in the tag handler class called count of type int initialized to 0.
Increment count in the doTag method. If the tag has a body, invoke the fragment for that body. Otherwise, output the value of count.
C. Start a counter at 1. Call getChildTags(). If it returns null, output the value of the counter. Otherwise, increment counter and continue from where getChildTags() is called. Skip processing of the body.
D. If the tag has a body, invoke the fragment for that body.Otherwise, start a counter at 1. Call getParent().
If it returns null, output the value of the counter Otherwise, increment the counter and continue from where getParent() is called.
Answer: D
QUESTION NO: 2
The sl:shoppingList and sl:item tags output a shopping list to the response and are used as follows:
The tag handler for sl:shoppingList is ShoppingListTag and the tag handler for sl:item is ItemSimpleTag.
ShoppingListTag extends BodyTagSupport and ItemSimpleTag extends SimpleTagSupport.
Which is true?
A. ItemSimpleTag can find the enclosing instance of ShoppingListTag by calling getParent() and casting the result to ShoppingListTag.
B. ShoppingListTag can find the child instances of ItemSimpleTag by calling super.getChildren() and casting each to an ItemSimpleTag.
C. It is impossible for ItemSimpleTag and ShoppingListTag to find each other in a tag hierarchy because one is a Simple tag and the other is a Classic tag.
D. ShoppingListTag can find the child instances of ItemSimpleTag by calling getChildren() on the
PageContext and casting each to an ItemSimpleTag.
E. ItemSimpleTag can find the enclosing instance of ShoppingListTag by calling findAncestorWithClass() on the PageContext and casting the result to ShoppingListTag.
Answer: A
QUESTION NO: 3
The tl:taskList and tl:task tags output a set of tasks to the response and are used as follows:
The tl:task tag supplies information about a single task while the tl:taskList tag does the final output. The tag handler for tl:taskList is TaskListTag. The tag handler for tl:task is TaskTag. Both tag handlers extend
BodyTagSupport.
Which allows the tl:taskList tag to get the task names from its nested tl:task children?
A. It is impossible for a tag handler that extends BodyTagSupport to communicate with its parent and child tags.
B. In the TaskListTag.doStartTag method, call super.getChildTags() and iterate through the results. Cast each result to a TaskTag and call getName().
C. In the TaskListTag.doStartTag method, call getChildTags() on the PageContext and iterate through the results.
Cast each result to a TaskTag and call getName().
D. Create an addTaskName method in TaskListTag. Have the TaskListTag.doStartTag method, return
BodyTag.EVAL_BODY_BUFFERED. In the TaskTag.doStartTag method, call super.getParent(), cast it to a TaskListTag, and call addTaskName().
E. Create an addTaskName method in TaskListTag. Have the TaskListTag.doStartTag method, return
BodyTag.EVAL_BODY_BUFFERED. In the TaskTag.doStartTag method, call findAncestorWithClass() on the PageContext, passing TaskListTag as the class to find. Cast the result to TaskListTag and call addTaskName().
Answer: D
QUESTION NO: 4
You are creating a content management system (CMS) with a web application front-end. The JSP that displays a given document in the CMS has the following general structure:
The citation tag must store information in the document tag for the document tag to generate a reference section at the end of the generated web page.
The document tag handler follows the Classic tag model and the citation tag handler follows the Simple tag model. Furthermore, the citation tag could also be embedded in other custom tags that could have either the Classic or Simple tag handler model.
Which tag handler method allows the citation tag to access the document tag?
A. public void doTag() {
JspTag docTag = findAncestorWithClass(this, DocumentTag.class);
((DocumentTag)docTag).addCitation(this.docID);
}
B. public void doStartTag() {
JspTag docTag = findAncestorWithClass(this, DocumentTag.class);
((DocumentTag)docTag).addCitation(this.docID);
}
C. public void doTag() {
Tag docTag = findAncestor(this, DocumentTag.class);
((DocumentTag)docTag).addCitation(this.docID);
}
D. public void doStartTag() {
Tag docTag = findAncestor(this, DocumentTag.class);
((DocumentTag)docTag).addCitation(this.docID);
}
Answer: A
QUESTION NO: 5
Click the Exhibit button.
As a maintenance feature, you have created this servlet to allow you to upload and remove files on your web server. Unfortunately, while testing this servlet, you try to upload a file using an HTTP request and on this servlet, the web container returns a 404 status.
What is wrong with this servlet?
A. HTTP does NOT support file upload operations.
B. The servlet constructor must NOT have any parameters.
C. The servlet needs a service method to dispatch the requests to the helper methods.
D. The doPut and doDelete methods do NOT map to the proper HTTP methods.
Answer: B
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Updated: May 28, 2022