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Xml - Interview Questions and Answers for 'Xml' - 24 question(s) found - Order By Newest

  Q1. Difference between SAX and DOM Parser ?Xml
Ans. A DOM (Document Object Model) parser creates a tree structure in memory from an input document whereas A SAX (Simple API for XML) parser does not create any internal structure.

A SAX parser serves the client application always only with pieces of the document at any given time whereas A DOM parser always serves the client application with the entire document no matter how much is actually needed by the client.

A SAX parser, however, is much more space efficient in case of a big input document whereas DOM parser is rich in functionality.

Use a DOM Parser if you need to refer to different document areas before giving back the information. Use SAX is you just need unrelated nuclear information from different areas.

Xerces, Crimson are SAX Parsers whereas XercesDOM, SunDOM, OracleDOM are DOM parsers.

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   Like         Discuss         Correct / Improve     java   xml   parsers   sax   dom parser   difference   architecture   technical lead   technical architect  markup language   sax vs dom     Asked in 14 Companies        frequent

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Frequently asked. Among first few questions in the J2EE segment of interview.
  Q2. What is deployment descriptor ?

or

What is the use of deployment descriptor ?
Java EE
Ans. Deployment Descriptor which is usually web.xml is used to specify the classes, resources and configuration of the application and how the web server uses them to serve web requests.This file is usually added to WEB-INF folder and contains following

* Servlet entries and url mapping
* Plugins
* Some info regarding authentication / filters
* Landing Page
* Event Handlers

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   Like         Discuss         Correct / Improve     web.xml   servlets  deployment descriptor     Asked in 15 Companies      basic        frequent

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 Q3. Can we have multiple servlets in a web application and How can we do that ?Java EE
Ans. Yes by making entries in web.xml

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   Like         Discuss         Correct / Improve     j2ee   servlets   servelets   web application   java   web.xml   yes-no   architecture


 Q4. What is XML ?Xml
Ans. XML or eXtensible Markup Language is a markup languages for describing data and its metadata.

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 Q5. What is DTD ?Xml
Ans. DTD or Document Type Definition is a standard agreed upon way of communication between two parties. Your application can use a standard DTD to verify that data that you receive
from the outside world is valid and can be parsed by your parser.

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   Like         Discuss         Correct / Improve     xml   markup language   dtd   document type definition   architecture


 Q6. What is XSD ?Xml
Ans. XSD or Xml Schema Definition is an extension of DTD. XSD is more powerful and extensible than DTD

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 Q7. What is JAXP ?Xml
Ans. Stands for Java API for XML Processing. This provides a common interface for creating and using SAX, DOM, and XSLT APIs in Java regardless of which vendor’s implementation is actually being used.

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 Q8. What is JAXB ?Xml
Ans. Stands for Java API for XML Binding. This standard defines a mechanism for writing out Java objects as XML and for creating Java objects from XML structures.

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 Q9. What is Maven's order of inheritance?Maven
Ans. 1. parent pom
2. project pom
3. settings
4. CLI parameters

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   Like         Discuss         Correct / Improve     maven   build technologies   pom.xml   parent pom   project pom   build management

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 Q10. What is marshalling ?Xml
Ans. Its the process of creating XML structures out of Java Objects which is used to traverse information across the network.

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 Q11. What is unmarshalling ?
Ans. Its the process of creating Java Objects out of XML structures.

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 Q12. What is the best practice configuration usage for files - pom.xml or settings.xml ?Maven
Ans. The best practice guideline between settings.xml and pom.xml is that configurations in settings.xml must be specific to the current user and that pom.xml configurations are specific to the project.

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 Q13. Which markup languages can be used in restful web services ? Rest
Ans. XML and JSON ( Javascript Object Notation ).

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 Q14. What is the use of hbm2ddl Configuration in Hibernate ?Hibernate
Ans. This configuration specifies if hibernate should creates the Schema / Table on its own if the respective table is not found.

"update" doesn't create the table if it's not found whereas configuration set as "create" creates the schema automatically.

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   Like         Discuss         Correct / Improve     hibernate   hibernate configuration   hibernate.cfg.xml   hbm2ddl


 Q15. Is there any relationship between Web.xml and Spring.xml ?Spring
Ans. No, there is no relationship between web.xml and spring.xml but you have to configure spring.xml in web.xml in order initialize beans when application starts up

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 Q16. What is the difference between filter and filter-mappings xml tag within deployment descriptor ?Java EE
Ans. filter tag speficies the filter name and respective class for handling filter action whereas filter mapping maps the filter to the url patterns ( specifying the url that needs to be intercepted )

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   Like         Discuss         Correct / Improve     deployment descriptor  web.xml  filters  filter mapping


 Q17. What is dynacache and role of cachespec.xml in WCS ?IBM WCS
Ans. Dynacache in WCS is the object cache. Instead of creating objects again and again , the store objects are rendered on the basis of matched rules. Caching rules are stored in a configuration file called cachespec.xml.

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 Q18. How to enable Cross Site scripting protection in WCS ?IBM WCS
Ans. By specifying XSiteScriptingProtection within wc-server.xml. Prohibited characters and attributes are specified within XSiteScriptingProtection to protect the application from any XSS attach.

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   Like         Discuss         Correct / Improve     Cross site scripting  XSS attack  XSS  XSiteScriptingProtection  wc-server.xml


 Q19. what are well formed and valid xmls ?XML
Ans. Well formed xml has all tags closed in the right order. well formed refers to syntax.
Valid xml is xml that succeeds validation against a DTD

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 Q20. what kind of dtd have you worked with ?XML
 This question was recently asked at 'American Express'.This question is still unanswered. Can you please provide an answer.


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 Q21. Is XML case sensitive ?XML
Ans. Yes

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 Q22. what is a qualified name ?XML
Ans. QNames were introduced by XML Namespaces in order to be used as URI references.It defines a valid identifier for elements and attributes. QNames are generally used to reference particular elements or attributes within XML documents.

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 Q23. What is XPath ?XML
Ans. XPath (XML Path Language) is a query language for selecting nodes from an XML document. In addition, XPath may be used to compute values (e.g., strings, numbers, or Boolean values) from the content of an XML document

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 Q24. Why would you use XML over JSON when using ajax ?JSON
 This question was recently asked at 'SoftLayer'.This question is still unanswered. Can you please provide an answer.


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 Q25. Which of the following is not an advantage of JSON over XML ?JSON
a. Lighter and Faster
b. Object Representation
c. Supports multiple data types
d. Backward compatible with all XML applications

Ans.d. Backward compatible with all XML applications

 Q26. Which of following is not true ?XML
a. Dom Parser loads the whole doument at once in memory
b. A DOM Parser is much more memory efficient
c. Dom Parser doesn't load the whole doument at once in memory
d. A SAX Parser is much more memory efficient

Ans.b. A DOM Parser is much more memory efficient


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