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New Questions

Sun River — Mon, 27 Nov 2006 01:26:00 GMT

Tech Tips Quiz

Over the years, the Enterprise Java Technologies Tech Tips have covered a wide variety of enterprise Java technology topics. Here's a short quiz that tests your knowledge of some topics covered in past Tech Tips. You can find the answers at the end of the quiz.

1. Which of the following inheritance strategies is not supported by the Java Persistence API?

a. Single Table Per Class Hierarchy

b. Joined Subclass

c. Single Table Per Class

d. Multiple Hierarchy

2. What is the primary purpose of the javax.xml.ws.Provider API?

a. Binds XML to Java objects.

b. Allows web services to work directly with messages.

c. Simplifies WSDL creation.

d. Specifies the URL of a web service provider.

e. None of the above

3. Which of the following statements about the ELResolver class is true?

a. In Java EE 5, the classes VariableResolver and PropertyResolver have been merged into the ELResolver class.

b. The way an expression is resolved can be customized by adding custom ELResolver subclasses to the ELResolver chain.

c. To make an ELResolver class visible to the Java EE runtime, it must be declared in an application configuration resource file.

d. All of the above.

4.                  What does the element in the following set of XML statements do:

              \
               xmlns:ns1="http://example.com/handlers">
                ns1:HelloService

a. Applies the handlers specified in the element to the service with the Java EE qname {http://example.com/handlers}HelloService .

b. Adds a service named HelloService to the handlers specified in the element.

c. Applies the handlers specified in the element to all ports whose names begin with HelloService .

d. None of the above.

5. What role does an XMLHttpRequest object play in an AJAX-enabled application?

a. It's used as a proxy to transmit requests to a server in a different domain.

b. It's used to identify a filter for exchange of XML-based AJAX requests between the client and server.

c. It's used to transmit AJAX requests asynchronously over HTTP to a server-side component.

d. There is no such thing as an XMLHttpRequest object.

Answers

1. Which of the following inheritance strategies is not supported by the Java Persistence API?

d. Multiple Hierarchy. The Java Persistence API allows for three different inheritance strategies that dictate how subclasses are mapped to database tables. The three strategies are single table per class hierarchy, joined subclass, and single table per class.

2. What is the primary purpose of the javax.xml.ws.Provider API?

b. Allows web services to work directly with messages. The JAX-WS 2.0 specification provides two new APIs which make it possible for web services to work with messages or message payloads. The APIs are javax.xml.ws.Provider and java.xml.ws.Dispatch . Provider is a server-side API, while Dispatch is a client-side API.

3. Which of the following statements about the ELResolver class is true?

d. All of the above. For more about the ELResolver class, especially how to create a customized ELResolver .

4. What does the element in the following set of XML statements do:



                   xmlns:ns1="http://example.com/handlers">
                      ns1:HelloService





    e.       Applies the handlers in the specified in the element to the service with the Java EE qname {http://example.com/handlers}HelloService. The element applies handlers to specific services. Handlers are interceptors that can be easily plugged into the JAX-WS 2.0 runtime environment to do additional processing of inbound and outbound messages. A handler chain is an ordered list of handlers that is used for configuring handlers. .

5.What role does an XMLHttpRequest object play in an AJAX-enabled application?

c. It's used to transmit AJAX requests asynchronously over HTTP to a server-side component. An XMLHttpRequest object plays a central role in the AJAX methodology as the means of interaction between the client and server-side component that processes AJAX requests.

Sun River 2006-11-27 09:26 发表评论

2006-11-26

Sun River — Mon, 27 Nov 2006 00:00:00 GMT

摘要: Part I. XSLT Programming 1) What is the exac... 阅读全文

Sun River 2006-11-27 08:00 发表评论

2006-11-26

Sun River — Sun, 26 Nov 2006 21:26:00 GMT

1). Processing (parsing) XML documents using:
   - Document Object Model (DOM)
   - Simple API for XML (SAX)
   Transforming XML documents using
   - XSL/XSLT
   - XPath
2).

Steps for DOM Parsing

1. Tell the system which parser you will use

2. Create a JAXP document builder

3. Invoke the parser to create a Document representing an XML

document

4. Normalize the tree

5. Obtain the root node of the tree

6. Examine and modify properties of the node

3).

Steps for SAX Parsing

1. Tell the system which parser you want to use

2. Create a parser instance

3. Create a content handler to respond to parsing events

4. Invoke the parser with the designated content handler and

document

Sun River 2006-11-27 05:26 发表评论

2006-11-26: Questions

Sun River — Sun, 26 Nov 2006 16:48:00 GMT

1). What is a document type definition and what is its purpose in XML? Explain the difference between a well-formed and a valid XML document.
Answer: The purpose of a DTD is to define the legal building blocks of an XML document. It defines the document structure with a list of legal elements. A DTD can be declared inline in your XML document, or as an external reference. Two definitions:
-).A well-formed file is one that obeys the general XML rules for tags: tags must be properly nested, opening and closing tags must be balanced, and empty tags must end with '/>'.
-). A valid file is not only well-formed, but it must also conform to a publicly available DTD that specifies which tags it uses, what attributes those tags can contain, and which tags can occur inside which other tags, among other properties.

2). External DTD:

3). Minimal but Complete XSLT Stylesheet

< xsl:stylesheet version="1.0"

xmlns:xsl="http://www.w3.org/1999/ XSL/Transform">

< /xsl:stylesheet >

4). Using XSLT, how would you extract a specfic attribute from an element in an XML document?
Ans: Extract attributes from XML data

     Attribute Value:




5). Templates--Controls which output is created from which input

--" xsl:template element form

--" match attribute contains an Xpath expression (Xpath expression identifies input node set it matches)

--" For each node in the node set, the

template contents (things between xsl:template tags) are instantiated and inserted into the output tree.

6). Attributes

In the DTD, XML element attributes are declared with an ATTLIST declaration. An attribute declaration has the following syntax:

As you can see from the syntax above, the ATTLIST declaration defines the element which can have the attribute, the name of the attribute, the type of the attribute, and the default attribute value.

The attribute-type can have the following values:

Value	Explanation
CDATA	The value is character data
(eval\|eval\|..)	The value must be an enumerated value
ID	The value is an unique id
IDREF	The value is the id of another element
IDREFS	The value is a list of other ids
NMTOKEN	The value is a valid XML name
NMTOKENS	The value is a list of valid XML names
ENTITY	The value is an entity
ENTITIES	The value is a list of entities
NOTATION	The value is a name of a notation
xml:	The value is predefined

The attribute-default-value can have the following values:

Value	Explanation
#DEFAULT value	The attribute has a default value
#REQUIRED	The attribute value must be included in the element
#IMPLIED	The attribute does not have to be included
#FIXED value	The attribute value is fixed

Attribute declaration example

DTD example:

  

XML example:

In the above example the element square is defined to be an empty element with the attributes width of type CDATA. The width attribute has a default value of 0.

Default attribute value

Syntax:


DTD example:


XML example:

Specifying a default value for an attribute, assures that the attribute will get a value even if the author of the XML document didn't include it.

Implied attribute

Syntax:

DTD example:


XML example:

Use an implied attribute if you don't want to force the author to include an attribute and you don't have an option for a default value either.

Required attribute

Syntax:

DTD example:


XML example:

Use a required attribute if you don't have an option for a default value, but still want to force the attribute to be present.

Fixed attribute value

Syntax:

DTD example:



XML example:

Use a fixed attribute value when you want an attribute to have a fixed value without allowing the author to change it. If an author includes another value, the XML parser will return an error.

Enumerated attribute values

Syntax:

DTD example:


XML example:

or

Sun River 2006-11-27 00:48 发表评论