What is @transactional annotation and Where we should be used @transactional annotation ?

-

 Interview Question from Capgemini ?

Q. What is @transational annotation and Where we should be used @transactional annotation ?

Ans : - 

@transactional  annotation :-

=> The @transactional annotation is used metadata that specifies that an interface, Class or method must have transactional Semantics.

Uses of  @transactional  annotation :-

=> we can use @transactional to wrap a method in a database transaction.
=> It allows us to set propagation, isolation timeout, read-only and rollback conditions for our transaction. we can also specify the transaction manager.

Comments

Post a Comment

Popular posts from this blog

How to create React project using command prompt?

-
Image
  How to create React project using command prompt? Ans :- firstly you have to install node js and npm in your system after after that follow these steps:- Step 1:- Open command prompt and for create project write  npx create-next-app Step 2:- Now it will say to write your Project name. Step 3 :- Now write your project name as per your choice. Step 4 :- Now it will ask what is your needs to create a project   Step 5 :- Now you can see dependencies are Installed as shown in below image Step 6 :- Now use this command for change the directory Step 7 :- Now you can see below directory is changed Step 8 :- Now for open the project in Vs code use this command  code . Step 9 :- Now you can see your project is directly opened in Visual Studio Code
Read more

How to achieve abstraction?

-
 Q. How to achieve abstraction ? Ans :- we can achieve abstraction by using abstract classes and Interfaces. Abstraction in java can be achieved in two ways: Using abstract classes:- Abstract classes achieve partial abstraction as concrete methods can also be defined in them. Using Interfaces :- Interfaces achieve complete abstraction as only abstract methods can be defined in them.
Read more

Interview Question? How to find square of each element in this Array {2,4,5,6,8} using map ?

-
 Q. How to find square of each element in this Array {2,4,5,6,8} Output : [4, 16, 25, 36, 64] Solution :- package p3; import java.util.Arrays; import java.util.List; import java.util.stream.Collectors; public class MapExample { public static void main(String[] args) { Integer[] abc={2,4,5,6,8}; List<Integer> list=Arrays.asList(abc); List<Integer> squareEle=list.stream().map(i->i*i).collect(Collectors.toList()); System.out.println(squareEle); for(Integer i:squareEle) { System.out.println(i); }   } } ******************************************************************** O/P:-  Output : [4, 16, 25, 36, 64]
Read more