Tag: Interview Questions

BeanFactory factory = new XmlBeanFactory(new FileInputStream('beans.xml'));

17) What are important ApplicationContext implementations in spring framework?

• ClassPathXmlApplicationContext – This context loads a context definition from an XML file located in the class path, treating context definition files as class path resources.
• FileSystemXmlApplicationContext – This context loads a context definition from an XML file in the filesystem.
• XmlWebApplicationContext – This context loads the context definitions from an XML file contained within a web application.

18) Explain Bean lifecycle in Spring framework?

1. The spring container finds the bean’s definition from the XML file and instantiates the bean.
2. Using the dependency injection, spring populates all of the properties as specified in the bean definition.
3. If the bean implements the BeanNameAware interface, the factory calls setBeanName() passing the bean’s ID.
4. If the bean implements the BeanFactoryAware interface, the factory calls setBeanFactory(), passing an instance of itself.
5. If there are any BeanPostProcessors associated with the bean, their post- ProcessBeforeInitialization() methods will be called.
6. If an init-method is specified for the bean, it will be called.
7. Finally, if there are any BeanPostProcessors associated with the bean, their postProcessAfterInitialization() methods will be called.

19) What is bean wiring?

20) How do add a bean in spring application?

<!DOCTYPE beans PUBLIC '-//SPRING//DTD BEAN//EN'
'http://www.springframework.org/dtd/spring-beans.dtd'>

   
   <bean id='bar' class='com.act.Bar'/

21) What are singleton beans and how can you create prototype beans?

22) What are the important beans lifecycle methods?

23) How can you override beans default lifecycle methods?

24) What are Inner Beans?

25) What are the different types of bean injections?

1. By setter
2. By constructor

26) What is Auto wiring?

27) What are different types of Autowire types?

• byName
• byType
• constructor
• autodetect

28) What are the different types of events related to Listeners?

• ContextClosedEvent – This is fired when the context is closed.
• ContextRefreshedEvent – This is fired when the context is initialized or refreshed.
• RequestHandledEvent – This is fired when the web context handles any request.

29) What is an Aspect?

30) What is a Jointpoint?

31) What is an Advice?

32) What is a Pointcut?

33) What is an Introduction in AOP?

34) What is a Target?

35) What is a Proxy?

36) What is meant by Weaving?

37) What are the different points where weaving can be applied?

• Compile Time
• Classload Time
• Runtime

38) What are the different advice types in spring?

• Around : Intercepts the calls to the target method
• Before : This is called before the target method is invoked
• After : This is called after the target method is returned
• Throws : This is called when the target method throws and exception

• Around : org.aopalliance.intercept.MethodInterceptor
• Before : org.springframework.aop.BeforeAdvice
• After : org.springframework.aop.AfterReturningAdvice
• Throws : org.springframework.aop.ThrowsAdvice

39) What are the different types of AutoProxying?

• BeanNameAutoProxyCreator
• DefaultAdvisorAutoProxyCreator
• Metadata autoproxying

40) What is the Exception class related to all the exceptions that are thrown in spring applications?

DataAccessException - org.springframework.dao.DataAccessException

41) What kind of exceptions those spring DAO classes throw?

42) What is DataAccessException?

43) How can you configure a bean to get DataSource from JNDI?

  
    java:comp/env/jdbc/myDatasource
  

44) How can you create a DataSource connection pool?

    
     ${db.driver}
 
    
     ${db.url}
 
    
     ${db.username}
 
    
     ${db.password}
 

45) How JDBC can be used more efficiently in spring framework?

46) How JdbcTemplate can be used?

JdbcTemplate template = new JdbcTemplate(myDataSource);

public class StudentDaoJdbc implements StudentDao {
  private JdbcTemplate jdbcTemplate;
  public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
     this.jdbcTemplate = jdbcTemplate;
  } more..
}

47) How do you write data to backend in spring using JdbcTemplate?

48) Explain about PreparedStatementCreator?

PreparedStatement createPreparedStatement (Connection conn) throws SQLException;

49) Explain about BatchPreparedStatementSetter?

setValues(PreparedStatement ps, int i) throws SQLException;
int getBatchSize();

50) Explain about RowCallbackHandler and why it is used?

void processRow(java.sql.ResultSet rs);