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Q1451. What are the points to be considered if we move from Eager initialization to Lazy Initialization in Hibernate ?

Hibernate

Ans. Make sure that the properties of dependent Hibernate entities are not accessed and if yes, better wrap the whole code within single transaction.

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_{Like Discuss Correct / Improve lazy loading lazy initialization}

Q1452. How does Lazy Initialization helps improving performance of an application ?

Hibernate

Ans. Lazy Initialization means , Load Dependencies when required. Which means less load on application resources as only required data is loaded upfront. It's not only good for better performance but for better resource utilization too.

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_{Like Discuss Correct / Improve lazy loading lazy initialization frequent}

Q1453. What are the benefits of creating immutable objects ?

Core Java

Ans. 1. Security and Safety - They can be shared across multiple threads as they are thread safe. Moreover, it protects then from bad state due to interception by the other code segment. One such problem due to mutability and access by alternate code segment could be the change of hash code and then the impact on its search with hash collections.

2. Reuse - In some cases they can be reused as only one copy would exist and hence it can be relied upon. For example - String Pool

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_{Like Discuss Correct / Improve immutable immutability objects Asked in 1 Companies Intermediate frequent}

Q1454. Can you name some of the Java frameworks in different domains ?

Frameworks

Ans. Web Framework - Spring , Struts, Play
Dependency Injection frameworks - Google Guice , PicoContainer and Dagger
ORM Framework - Hibernate
Big Data / ETL Frameworks - Apche Hadoop , Apache Crunch, Apache Spark.
View Frameworks - JSF , Apache Wicket,jtwig.
Java Gui Frameworks - SWT , AWT, JavaFX
Testing - Junit, Mockito, PowerMock, EasyMock, JMock, JMockit
Rest Web services - Jersey , Restlet , RestX, RestEasy ,Restfulie

Here is the big list for reference - http://javasearch.buggybread.com/home2.php?keyword=

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_{Like Discuss Correct / Improve frameworks Asked in 2 Companies intermediate frequent}

Q1455. What is the difference between

File f = new File("homexyz.txt");

and

File f = File.createTempFile("xyz",".txt","home"); ?

Core Java

Ans. First will not create physical file in storage whereas the second will.

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_{Like Discuss Correct / Improve file handling File.createTempFile file handling intermediate rare}

Q1456. What are the different J2EE modules ?

Java EE

Ans. 1. Application Client Module
2. Web Module
3. EJB
4. Resource Adapter

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Q1457. What does the Web module contains ?

Java EE

Ans. JSP files, media files and deployment descriptor ( web.xml )

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Q1458. What is an applet ?

Core Java

Ans. Applet is a J2EE component or a tiny application that gets executed in a widget engine ( like browser )

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Q1459. What is archiving ?

Process

Ans. It's the process of preserving the state of an object and then restoring it.

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Q1460. What are callback methods ?

Core Java

Ans. Component methods called by the container to notify the component of the events

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Q1461. What is fulfillment center ?

ECommerce

Ans. Fulfillment center or Delivery Center is the store or warehouse from where the actual delivery of merchandise takes place.

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Q1462. What is cascade or cascading delete ?

Process

Ans. A deletion that triggers another deletion

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Q1463. What is a certificate authority ?

Security

Ans. A trusted organization which issues public key certificates and provides identification to the bearer.

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_{Like Discuss Correct / Improve authentication auth certificates}

Q1464. How and Why Strings are interned in Java ?

Core Java

Ans. String class has a public method intern() that returns a canonical representation for the string object. String class privately maintains a pool of strings, where String literals are automatically interned.

these are automatically interned so as to have efficient String comparison using == operator instead of equals which is usually slower.

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_{Like Discuss Correct / Improve string string pool string intern Asked in 1 Companies}

Q1465. How Access control Policies are implemented in WCS ?

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