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Hibernate - Interview Questions and Answers for 'L' - 121 question(s) found - Order By Newest

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Frequently asked question in companies using Hibernate.
  Q1. What is Lazy Initialization in Hibernate ?Hibernate
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Ans. It's a feature to lazily initialize dependencies , relationship and associations from the Database. Any related references marked as @OneToMany or @ManyToMany are loaded lazily i.e when they are accessed and not when the parent is loaded.

  Sample Code for Lazy Initialization

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 Q2. What are the ways to avoid LazyInitializationException ?Hibernate
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Ans. 1. Set lazy=false in the hibernate config file.

2. Set @Basic(fetch=FetchType.EAGER) at the mapping.

3. Make sure that we are accessing the dependent objects before closing the session.

4. Force initialization using Hibernate.initialize

5. Using Fetch Join in HQL.

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Frequently asked question in companies using hibernate.
  Q3. Difference between first level and second level cache in hibernate ?Hibernate
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Ans. 1. First level cache is enabled by default whereas Second level cache needs to be enabled explicitly.

2. First level Cache came with Hibernate 1.0 whereas Second level cache came with Hibernate 3.0.

3. First level Cache is Session specific whereas Second level cache is shared by sessions that is why First level cache is considered local and second level cache is considered global.

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Very frequently asked in HCL Tech ( Based of 4 inputs )
  Q4. Write a Program to reverse a string iteratively and recursivelyCore Java

Ans. Using String method -

new StringBuffer(str).reverse().toString();

Iterative -

Strategy - Loop through each character of a String from last to first and append the character to StringBuilder / StringBuffer

public static String getReverseString(String str){
StringBuffer strBuffer = new StringBuffer(str.length);
for(int counter=str.length -1 ; counter>=0;counter--){
strBuffer.append(str.charAt(counter));
}
return strBuffer;
}

Recursive -

Strategy - Call the method with substring starting from 2nd character recursively till we have just 1 character.

public static String getReverseString(String str){
if(str.length <= 1){
return str;
}
return (getReverseString(str.subString(1)) + str.charAt(0);
}

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 Q5. What are the contents of Hibernate configuration file ( hibernate.cfg.xml ) ?Hibernate
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Ans. HBM Files ( Mapping )
DB Connection ( DB Connection String , User Name , Password , Pool Size )
SQL Dialect ( SQL variant to be generated )
Show SQL ( Show / No show SQL on Console )
Auto Commit ( True / False )

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 Q6. What things you would care about to improve the performance of Application if its identified that its DB communication that needs to be improved ?Solution
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Ans. 1. Query Optimization ( Query Rewriting , Prepared Statements )

2. Restructuring Indexes.

3. DB Caching Tuning ( if using ORM )

4. Identifying the problems ( if any ) with the ORM Strategy ( If using ORM )

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 Q7. What are the configuration files in Hibernate ?Hibernate
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Ans. hibernate.cfg.xml ( Main Configuration File )

and *.hbm.xml files ( Mapping Files )

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Very frequently asked if being interviewed for hibernate. Frequently asked in Tata Consultancy (TCS) and Overstock.com
  Q8. Difference between load and get ?Hibernate
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Ans. If id doesnt exist in the DB load throws an exception whereas get returns null in that case.get makes the call to DB immediately whereas load makes the call to proxy.

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 Q9. What are the restrictions for the entity classes ?Hibernate
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Ans. 1. Entity classes should have default constructor.

2. Entity classes should be declared non final.

3. All elements to be persisted should be declared private and should have public getters and setters in the Java Bean style.

4. All classes should have an ID that maps to Primary Key for the table.

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 Q10. What is the use of @GeneratedValue annotation in Hibernate?Hibernate
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Ans. This annotation is added to the auto increment column with the strategy to increment the column value. Usually this is added to the surrogate primary key column and specified with the Database Sequence.

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 Q11. Write a Program that gets a set of numbers , filters out the non prime numbers , calculate the factorial of each prime number and then finds the average of all factorials using Lambda expressions2017-05-14 14:02:57

Ans. public class BuggyBread1 {
   
   public static void main(String args[]) {
      
      // Declare and Initialize the Collection
      Set<Integer> intSet = new HashSet<Integer>();

      // Add Elements
      intSet.add(1);
      intSet.add(2);
      intSet.add(3);
      intSet.add(4);
      intSet.add(5);

      double averageOfNonPrimeFactorials = intSet.stream().filter(p->checkIfPrime(p)).collect(Collectors.averagingInt(p->calculateFactorial(p)));
      
      System.out.println(averageOfNonPrimeFactorials );
   }
   
   static private boolean checkIfPrime(int num){
      for(int count=2;count < num;count++){
         if(num % count == 0){
            return false;
         }
      }
      return true;
   }
   
   static private int calculateFactorial(int num){
      int factorial = 1;
      for(int count=num;count > 0;count--){
         factorial = factorial * count;
      }
      return factorial;
   }
}

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 Q12. Write a Program for Graph Depth First Traversal using Apache Commons MultiMapAlgorithm2017-07-23 10:01:14

Ans. import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.Multimap;

public class Graph {
   private static Multimap<Integer,Integer> adjacentDirectedNodesMap = ArrayListMultimap.create();
   private static Set<Integer> alreadyVisited = new HashSet();
   
   static{
      adjacentDirectedNodesMap.put(1, 2);
      adjacentDirectedNodesMap.put(1, 3);
      adjacentDirectedNodesMap.put(1, 5);
      adjacentDirectedNodesMap.put(2, 4);
      adjacentDirectedNodesMap.put(4, 5);
   }
   
   public static void main(String[] args){
      ArrayList visited = new ArrayList();
      
      Integer startNode = 1;
      
      displayAdjacentNodes(startNode);
      
   }
   
   private static void displayAdjacentNodes(Integer integer){
      if(alreadyVisited.contains(integer)){
         return;
      }
      alreadyVisited.add(integer);
      System.out.println(integer);
      for(Integer adjacentNodes: adjacentDirectedNodesMap.get(integer)){
         displayAdjacentNodes(adjacentNodes);
      }
   }
   
}

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 Q13. Write a Program for Graph Breadth First Traversal using Apache Commons MultiMap2017-07-23 10:07:15

Ans. import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.Multimap;

public class Graph {
   private static Multimap<Integer,Integer> adjacentDirectedNodesMap = ArrayListMultimap.create();
   private static Set<Integer> alreadyVisited = new HashSet();
   
   static{
      adjacentDirectedNodesMap.put(1, 2);
      adjacentDirectedNodesMap.put(1, 3);
      adjacentDirectedNodesMap.put(1, 5);
      adjacentDirectedNodesMap.put(2, 4);
      adjacentDirectedNodesMap.put(4, 5);
   }
   
   public static void main(String[] args){
      ArrayList visited = new ArrayList();
      
      Integer startNode = 1;
      
      displayAdjacentNodes(startNode);
      
   }
   
   private static void displayAdjacentNodes(Integer integer){
      System.out.println(integer);
      for(Map.Entry<Integer, Collection<Integer>> adjacentNodes: adjacentDirectedNodesMap.asMap().entrySet()){
         for(Integer integer1:adjacentNodes.getValue()){
            if(alreadyVisited.contains(integer1)){
               continue;
            }
            alreadyVisited.add(integer1);
            System.out.println(integer1);
         }
      }
   }
   
}

  Sample Code for import java.util.ArrayList; import java.util.Collection; import java.util.HashSet; import java.util.Map; import java.util.Set; import com.google.common.collect.ArrayListMultimap; import com.google.common.collect.Multimap;

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 Q14. Write a program to show thread usage in Java by implementing runnable interface2017-08-03 12:16:07

Ans. public class MyClass {
   static class MyThreadClass implements Runnable{

      public void start() {
         Thread t = new Thread(this,"threadName");
         t.start();
      }
      
      @Override
      public void run() {
         System.out.println("Hello");
         try {
            Thread.sleep(1000);
            System.out.println("Hello Again");
         } catch (InterruptedException e) {
            e.printStackTrace();
         }
         
      }
      
   }
   
   public static void main(String[] args){
      MyThreadClass myThreadClass = new MyThreadClass();
      myThreadClass.start();
      
      MyThreadClass myThreadClass2 = new MyThreadClass();
      myThreadClass2.start();
   }
}

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 Q15. What are different types of second level cache ?Hibernate
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Ans. 1. EHCache ( Easy Hibernate )
2. OSCache ( Open Symphony )
3. Swarm Cache ( JBoss )
4. Tree Cache ( JBoss )

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 Q16. What are the different types of inheritance in Hibernate ?Hibernate
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Ans. Table Per Class , Table per Sub Class , Table per Concrete Class

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Very frequently asked Hibernate interview question. Frequently asked in TCS ( based on 2 feedback )
  Q17. What are different types of associations in Hibernate ?Hibernate
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Ans. There are 4 types of associations in Hibernate

One to One
One to Many
Many to One
Many to Many

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  Q18. What is lazy fetching in Hibernate ?Hibernate
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Ans. Lazy fetching is the technique of not loading the child objects when parent objects are loaded. By default Hibernate does not load child objects. One can specify whether to load them or not while doing the association.

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 Q19. What is the way to rollback transaction if something goes wrong using hibernate API ? Hibernate
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Ans. We can have the code calling Hibernate API within try block and can have transaction.rollback within Catch.

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 Q20. What is the use of hbm2ddl Configuration in Hibernate ?Hibernate
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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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 Q21. What is the difference between these 2 annotations ?

@Entity ( name ="EMPLOYEES")
@Entity @Table ( name=""EMPLOYEES"" )

@Entity ( name="EMP")
@Table ( name="EMPLPYEES" )
Hibernate
Admin
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Ans. First Annotation will set the Entity name as EMPLOYEES and hence will try to map with the same Table name.

The second annotation will make the Entity mapped to table EMPLOYEES irrespective of the Entity Name ( which is class name in this case ).

Third Annotations will set the different names for Enitity and Table and will explicitly map them.

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 Q22. What are the different ID generating strategies using @GeneratedValue annotation ?Hibernate
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Ans. Auto , Identity , Sequence and Table.

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 Q23. How to do Eager loading in Hibernate ?Hibernate
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Ans. Using

lazy = false in hibernate config file

or

@Basic(fetch=FetchType.EAGER) at the mapping

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 Q24. What is cascade ?Hibernate
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Ans. Instead of Saving Parent as well as Child Entities individually , Hibernate provides the option to persist / delete the related entities when the Parent is persisted.

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 Q25. Which type of associated Entities are Eagerly loaded by Default ?Hibernate
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Ans. OneToOne

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 Q26. After which Hibernate version , related Entities are initialized lazily ?Hibernate
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Ans. After Hibernate 3.0

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 Q27. Can we declare Entity class as final ?Hibernate
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Ans. Yes but as Hibernate creates the Proxy Classes inherited from the Entity Classes to communicate with Database for lazy initialization. Declaring entity classes as final will prohibit communication with database lazily and hence will be a performance hit.

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 Q28. What is the difference between JPA and Hibernate ?Hibernate
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Ans. JPA or Java Persistence API is a standard specification for ORM implementations whereas Hibernate is the actual ORM implementation or framework.

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 Q29. What is the advantage of JPA ?Database
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Ans. Its a specification that guides the implementation of ORM frameworks. Implementations abiding by the specification would mean that one can be replaced with other in an application without much hassle. Only the Features that are added over the specification needs to be taken care of if any such change is made.

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 Q30. What is Criteria in Hibernate ?Hibernate
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Ans. Criteria is a simplified API for retrieving entities by composing Criterion objects.

For example - session.createCriteria(Employee.class).add( Restrictions.like("name", "A%") ).list();

will return all employee objects having name starting with A.

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 Q31. How do we specify the criteria if it involves mapping between two entities or join between tables ?Hibernate
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Ans. The following code returns the list of Employee objects having employee name starting with A and Dept Name ( Department , Employee Mapped ).

session.createCriteria(Employee.class,"emp")
.createAlias("emp.department", "dept",Criteria.INNER_JOIN)
.add( Restrictions.like("name", "A%") )
.add(Restrictions.eq("dept.name","Finance")
.list();

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 Q32. What is your choice while writing queries within Hibernate - criteria or HQL ?Hibernate
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Ans. I prefer using Criteria for Dynamic queries and HQL for static queries.

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 Q33. Difference between JDBC and Hibernate ?Database2016-12-06 09:57:14

Ans. JDBC is a standard Java Api for Database communication whereas Hibernate is an ORM framework that uses JDBC to connect with Database.

Hibernate is another layer of object table mapping over JDBC that provide a database independent, object oriented and an efficient way of database communication.

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 Q34. What are the points to be considered if we move from Eager initialization to Lazy Initialization in Hibernate ?Hibernate2017-01-20 16:00:11

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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 Q35. How does Lazy Initialization helps improving performance of an application ?Hibernate2017-01-20 16:18:52

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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 Q36. What does the following exception means

org.hibernate.LazyInitializationException: could not initialize proxy - no Session
Hibernate2017-02-16 11:28:15

Ans. The error states that Hibernate is not able to initialize proxy / dependent entity objects as there is no session or transaction present. Very likely we are trying to load the dependent entities lazily but the call to dependent object property is not wrapped within the session or transaction.

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 Q37. If you are given choice to avoid LazyInitializationException using any of the following measures, which are the ones you will choose and why ?

1. Set lazy=false in the hibernate config file.
2. Set @Basic(fetch=FetchType.EAGER) at the mapping.
3. Make sure that we are accessing the dependent objects before closing the session.
4. Force initialization using Hibernate.initialize
Hibernate2017-02-16 13:32:41

Ans. First resolution is a big No as it conveys no lazy loading in complete app. even second is advocating the same but for a particular mapping.

third one is most appropriate if loading and dependent entity property access is closer to each other in code and can be accomplished.

I don't mind using 4th too.

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 Q38. Is it advisable to keep session or transaction open for long time just to avoid LazyInitializationException ?Hibernate2017-02-16 20:33:52

 This question is still unanswered. Can you please provide an answer.


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 Q39. What is the difference between session.clear and session.evict ?Hibernate2017-03-09 09:20:44

Ans. session.clear clears all the objects from session whereas session.evict is used for evicting a particular entity.

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 Q40. What is the use of Hibernate session.clear() ?Hibernate2017-03-09 09:22:22

Ans. It is used to clear the session and is used to dissociate disconnect all the objects from the session.

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