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Freshers / Beginner level questions & answers

Ques 1. What is JPA?

JPA (Java Persistence API) is a Java EE and Java SE specification that describes a management system for saving java objects to relational database tables in a convenient form.

Java itself does not contain JPA implementations, however, there are many implementations of this specification from different companies (open and not). This is not the only way to save java objects in databases (ORM systems), but one of the most popular in the Java world.

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Ques 2. What is JPA and its features?

Java Persistence API (JPA) is a collection of classes and methods to persistently store vast amounts of data in a database which is provided by the Oracle Corporation.
The Java Persistence API (JPA) is now here to simplify the developer's life. Developers can now use the JPA API to develop applications easily. Here are the features of JPA:
  • JPA supports pluggable, third-party persistence providers such as Hibernate and TopLink, etc.
  • JDK 11 annotations are fully supported.
  • Few java classes are required to develop persistence applications.
  • JPA application can run outside the container also. So, developers can use JPA capabilities in desktop applications also.
  • No need to write deployment descriptors. Annotations-based meta-data are supported in JPA applications.
  • Annotation defaults can be used in the model class, which saves a lot of development time.
  • Provides cleaner, easier, standardized object-relational mapping.
  • JPA supports inheritance, polymorphism, and polymorphic queries.
  • JPA also supports named (static) and dynamic queries.
  • JEB QL is a very powerful query language provided by JPA.
  • JPA helps you build a persistence layer that is vendor-neutral and any persistence provider can be used.
  • Many IDEs are also available to ease the development of JPA applications.
  • Some IDEs can generate the model and persistence code from the database schema.
  • JPA application can also be configured to generate database schema based on the persistence model.
  • It is also very easy to switch to the most performing persistence provider. You can easily move to any commercial persistence provider.

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Ques 3. Why to use JPA?

  • JPA is the standard, and standards are good!
  • Using JPA does not tie you to Hibernate.
  • JPA gives you most of the features of plain old Hibernate, except:
  • No criteria queries in JPA 2.0. Criteria query is a neat feature of Hibernate that constructs queries using Java-based combinators instead of the alternate query language, getting the benefit of IntelliSense and Eclipse's refactoring tools.
  • JPA doesn't have Hibernate's DeleteOrphan cascade type.
  • Delete Orphan is a useful annotation that directs Hibernate to delete entities in a collection if the parent is deleted, preventing orphaning.
  • JPA doesn't have an equivalent to Hibernate's ScrollableResults.

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Ques 4. What is ORM in JPA?

Mapping between database tables and java objects called ORM (Object Relational Mapping). JPA (Java Persistence API) provides and ORM facility for managing relational tables in Java applications. It is a specification and few implementations are like Hibernate, JDO, EJB, Toplink. By using JPA can be fetched data, insert, update etc.

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Ques 5. What is an Entity?

A class which should be persisted in a database it must be annotated with javax.persistence.EntitySuch a class is called Entity. 

An instances of the class will be a row in the person table. So, the columns in the person table will be mapped to the Person java object annotated as @Entity.
While insert, update or fetch record to or from the database we use entity as mapping with relational tables.

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Ques 6. What is the difference between persistence.xml and hibernate.cfg.xml?

When using JPA need persistence.xml and while using Hibernate API need hibernate.cfg.xml. When using JPA or Hibernate not needed both xmls, need the xml configuration file according to JPA or Hibernate.

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Ques 7. What is the difference between JPA and Hibernate?

Hibernate is one of the most popular open-source implementations of the latest specification (JPA 3.0). Even more likely the most popular, almost standard de facto.

That is, JPA only describes rules and APIs, and Hibernate implements these descriptions, however Hibernate (like many other JPA implementations) has additional features not described in JPA (and is not portable to other JPA implementations).

For solid differences, check JPA vs Hibernate.

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Ques 8. What are the two types of elements in Entity classes?

JPA indicates that it can work both with properties of classes (property), designed in the style of JavaBeans, or with fields (field), that is, class variables (instance variables). Accordingly, the type of access will be either property access or field access.

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Ques 9. What types of connections (relationships) between Entities?

There are four types of connections

  1. One-To-One: one-to-one connection, that is, one Entity object can be associated with no more than one object of another Entity
  2. One-To-Many: one-to-many connection, one Entity object can be associated with a whole collection of Entity
  3. Many-To-One: A relationship where one entity (column or set of columns) is/are referenced with another entity (column or set of columns) that contains unique values. In relational databases, these relations are applicable by using foreign key/primary key between tables.
  4. Many-To-Many: A relationship is a connection between two types of entities. In the case of a many-to-many relationship, both sides can relate to multiple instances of the other side. Note that it's possible for entity types to be in a relationship with themselves.

Bi-directional: A mapping is the most common way to model this relationship with JPA and Hibernate. It uses an attribute on the Order and the OrderItem entity. This allows you to navigate the association in both directions in your domain model and your JPQL queries.

Uni-directional: A mapping is an association between one persistence object and another one related persistence object. If one persistence object uses another and in back if other is not using the first persistence object then it becomes unidirectional.

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Ques 10. What is Persistent Fields?

  • If the entity class uses persistent fields, the Persistence runtime accesses entity-class instance variables directly.
  • All fields not annotated javax.persistence.Transient or not marked as Java transient will be persisted to the data store.
  • The object/relational mapping annotations must be applied to the instance variables.

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Ques 11. Is it possible to use JPA with NoSQL databases?

In general, the JPA specification says only about mapping java objects into relational database tables, but there are a number of implementations of this standard for NoSQL databases: Kundera, DataNucleus, ObjectDB, and a number of others. Naturally, not all specification-specific features for relational databases are transferred to NoSQL databases completely.

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Ques 12. What JPA requirements for Entity classes can you list?

1) Entity class must be annotated with Entity or described in the XML configuration file JPA,

2) Entity class must contain a public or protected constructor with no arguments (it can also have constructors with arguments),

3) Entity class must be a top-level class (top-level class),

4) Entity class cannot be an enum or interface,

5) Entity class cannot be the final class,

6) Entity class cannot contain final fields or methods if they participate in the mapping (persistent final methods or persistent final instance variables),

7) If an Entity class object is passed by value as a separate object (detached object), for example through a remote interface (through a remote interface), it must also implement a Serializable interface,

8) The Entity class fields should be directly accessible only to the methods of the Entity class and should not be directly accessible to other classes using this entity. Such classes should refer only to methods (getter/setter methods or other business logic methods in the Entity class),

9) The Entity class must contain a primary key, that is, an attribute or group of attributes that uniquely defines the record of this Entity class in the database.

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Ques 13. What is Persistent Properties?

  • If the entity uses persistent properties, the entity must follow the method conventions of JavaBeans components.
  • JavaBeans-style properties use getter and setter methods that are typically named after the entity class's instance variable names.
  • For every persistent property of type Type of the entity, there is a getter method getProperty and a setter method setProperty.
  • If the property is a Boolean, you may use isProperty instead of getProperty. For example, if a Customer entity uses persistent properties and has a private instance variable called firstName, the class defines a getFirstName and setFirstName method for retrieving and setting the state of the firstName instance variable.

    The method signature for single-valued persistent properties are as follows:

    Type getProperty()
    void setProperty(Type type)

    The object/relational mapping annotations for persistent properties must be applied to the getter methods. Mapping annotations cannot be applied to fields or properties annotated @Transient or marked transient.

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Ques 14. Explain Life Cycle of a JPA Entity.

Key states that an entity might be in:

  1. New / Transient: An object is instantiated but not yet associated with an Entity Manager and has no representation in the database.
  2. Managed / Persisted.
  3. Detached: Detached entity objects are objects in a special state in which they are not managed by any EntityManager but still represent objects in the database. Detached objects are often returned from a persistence tier to the web layer where they can be displayed to the end user in some form. Changes can be made to a detached object, but these changes won't be persisted in the database until the entity is reassociated with a persistence context (the entity is merged back to an EntityManager to become managed again).
  4. Removed.

    - The merge method's major task is to transfer the state from an unmanaged entity (passed as the argument) to its managed counterpart within the persistence context.
    - Merge deals with both new and detached entities. Merge causes either INSERT or UPDATE operation according to the sub-scenario (on the one hand it is more robust, on the other hand, this robustness needn't be required.)
    - Persist always causes INSERT SQL operation is executed (i.e. an exception may be thrown if the entity has already been inserted and thus the primary key violation happens.)

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Ques 15. Insert a record mechanism using JPA. Provide an example.

@Override
@Transactional
public void create(Category entity) throws MeetingAppDAOException {
  try {
    logger.info("Enter - create()");
    super.create(entity);
    logger.info("Exit - create()");
  } catch (PersistenceException exception) {
    logger.error("create()::REASON OF EXCEPTION=" + exception.getMessage(), e);
  }
}

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Ques 16. What is the attribute of the Entity class in JPA terminology?

JPA indicates that it can work both with properties of classes (property), designed in the style of JavaBeans, or with fields (field), that is, class variables (instance variables). Both types of elements of the Entity class are called attributes of the Entity class.

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Intermediate / 1 to 5 years experienced level questions & answers

Ques 17. What is an EntityManager?

  • Entity manager javax.persistence.EntityManager provides the operations from and to the database, e.g. find objects, persists them, remove objects from the database, etc.
  • Entities which are managed by an EntityManager will automatically propagate these changes to the database (if this happens within a commit statement). These objects are known as persistent object. 
  • If the Entity Manager is closed (via close()) then the managed entities are in a detached stateThese are known as the detached objects. If you want synchronize them again with the database, the a Entity Manager provides the merge() method. Once merged, the object(s) becomes perstent objects again.
  • The EntityManager is the API of the persistence context, and an EntityManager can be injected directly in to a DAO without requiring a JPA Template. The Spring Container is capable of acting as a JPA container and of injecting the EntityManager by honoring the @PersistenceContext (both as field-level and a method-level annotation).

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Ques 18. What is Embeddable classes?

  • Entities may use persistent fields, persistent properties, or a combination of both.
  • If the mapping annotations are applied to the entity's instance variables, the entity uses persistent fields.
  • If the mapping annotations are applied to the entity's getter methods for JavaBeans-style properties, the entity uses persistent properties.

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Ques 19. What data types are allowed in the attributes of the Entity class (fields or properties)?

Valid attribute types for Entity classes are:

  1. primitive types and their Java wrappers,
  2. strings,
  3. any Java serializable types,
  4. enums;
  5. entity types;
  6. embeddable classes
  7. collection types

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Experienced / Expert level questions & answers

Ques 20. What is JPQL?

JPQL (Java Persistence Query Language) offers an object-oriented syntax for expressing queries that are very similar to SQL. The language is interpreted at runtime, which means you cannot use the compiler to verify the correctness and integrity of a query. To address this limitation, Hibernate includes a Criteria API, which allows queries to be expressed programmatically.

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Ques 21. Example of an Entity with Embedded class.

import java.io.Serializable;
import java.util.Date;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.EmbeddedId;
import javax.persistence.Entity;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

@Entity
@Table(name = "categoryparticipant")
@NamedQueries({
@NamedQuery(name = "Categoryparticipant.getCategoriesOfParticipant", query = "SELECT cp.category from Categoryparticipant cp where cp.participant.participantid= :participantid")
})
public class Categoryparticipant implements Serializable {
private static final long serialVersionUID = 1L;
@EmbeddedId
protected CategoryparticipantPK categoryparticipantPK;
@Basic(optional = false)
@Column(name = "CreationDate")
@Temporal(TemporalType.TIMESTAMP)
private Date creationDate;
@JoinColumn(name = "ParticipantId", referencedColumnName = "ParticipantId", insertable = false, updatable = false)
@ManyToOne(optional = false)
private Participant participant;
@JoinColumn(name = "CategoryId", referencedColumnName = "CategoryId", insertable = false, updatable = false)
@ManyToOne(optional = false)
private Category category;

public Categoryparticipant() {
}

public Categoryparticipant(CategoryparticipantPK categoryparticipantPK) {
this.categoryparticipantPK = categoryparticipantPK;
}

public Categoryparticipant(CategoryparticipantPK categoryparticipantPK, Date creationDate) {
this.categoryparticipantPK = categoryparticipantPK;
this.creationDate = creationDate;
}

public Categoryparticipant(int categoryId, int participantId) {
this.categoryparticipantPK = new CategoryparticipantPK(categoryId, participantId);
}

public CategoryparticipantPK getCategoryparticipantPK() {
return categoryparticipantPK;
}

public void setCategoryparticipantPK(CategoryparticipantPK categoryparticipantPK) {
this.categoryparticipantPK = categoryparticipantPK;
}

public Date getCreationDate() {
return creationDate;
}

public void setCreationDate(Date creationDate) {
this.creationDate = creationDate;
}

public Participant getParticipant() {
return participant;
}

public void setParticipant(Participant participant) {
this.participant = participant;
}

public Category getCategory() {
return category;
}

public void setCategory(Category category) {
this.category = category;
}

@Override
public int hashCode() {
int hash = 0;
hash += (categoryparticipantPK != null ? categoryparticipantPK.hashCode() : 0);
return hash;
}

@Override
public boolean equals(Object object) {
// TODO: Warning - this method won't work in the case the id fields are not set
if (!(object instanceof Categoryparticipant)) {
return false;
}
Categoryparticipant other = (Categoryparticipant) object;
if ((this.categoryparticipantPK == null && other.categoryparticipantPK != null) || (this.categoryparticipantPK != null && !this.categoryparticipantPK.equals(other.categoryparticipantPK))) {
return false;
}
return true;
}

@Override
public String toString() {
return "com.xchanging.entity.jpa.Categoryparticipant[categoryparticipantPK=" + categoryparticipantPK + "]";
}

}

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Ques 22. Give an example of Embeddable class for previous question Categoryparticipant entity.

import java.io.Serializable;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Embeddable;

@Embeddable
public class CategoryparticipantPK implements Serializable {
@Basic(optional = false)
@Column(name = "CategoryId")
private int categoryId;
@Basic(optional = false)
@Column(name = "ParticipantId")
private int participantId;

public CategoryparticipantPK() {
}

public CategoryparticipantPK(int categoryId, int participantId) {
this.categoryId = categoryId;
this.participantId = participantId;
}

public int getCategoryId() {
return categoryId;
}

public void setCategoryId(int categoryId) {
this.categoryId = categoryId;
}

public int getParticipantId() {
return participantId;
}

public void setParticipantId(int participantId) {
this.participantId = participantId;
}

@Override
public int hashCode() {
int hash = 0;
hash += (int) categoryId;
hash += (int) participantId;
return hash;
}

@Override
public boolean equals(Object object) {
// TODO: Warning - this method won't work in the case the id fields are not set
if (!(object instanceof CategoryparticipantPK)) {
return false;
}
CategoryparticipantPK other = (CategoryparticipantPK) object;
if (this.categoryId != other.categoryId) {
return false;
}
if (this.participantId != other.participantId) {
return false;
}
return true;
}

@Override
public String toString() {
return "com.xchanging.entity.jpa.CategoryparticipantPK[categoryId=" + categoryId + ", participantId=" + participantId + "]";
}

}

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Ques 23. How to fetch a record using NamedQuery?

public Category findByCategoryId(Long categoryId) {
try {
logger.info("Enter - findByCategoryId()");
Query lQuery = (Query) em.createNamedQuery("Category.findByCategoryId");
Integer intValue = categoryId.intValue();
lQuery.setParameter("categoryId", intValue);
Category category = (Category) lQuery.getSingleResult();
logger.info("Exit - findByCategoryId");
return category;
} catch (PersistenceException exception) {
logger.debug(exception.getCause().getStackTrace());
logger.error("CategoryDaoImpl::maxCategoryId()::REASON OF EXCEPTION=" + exception.getMessage() + exception.getCause());
} finally {
closeEntityManager();
}

}

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Ques 24. What is the difference between JPA and JDO?

JPA (Java Persistence API) and Java Data Objects (JDO) are two specifications for storing java objects in databases.

If JPA is concentrated only on relational databases, then JDO is a more general specification that describes the ORM for any possible bases and repositories.

In principle, JPA can be viewed as part of the JDO specification specialized in relational databases, even though the API of these two specifications does not completely match.

The “developers” of specifications also differ – if JPA is developed as JSR, then JDO was first developed as JSR, and now it is developed as an Apache JDO project.

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Ques 25. What requirements does JPA set for Embeddable classes?

  1. Such classes must satisfy the same rules as the Entity classes, except that they do not have to contain a primary key and be marked with the Entity annotation.
  2. The Embeddable class must be marked with the Embeddable annotation or described in the XML configuration file JPA.

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Ques 26. What is a Mapped Superclass?

A mapped Superclass is a class from which Entity is inherited, it may contain JPA annotations, however, such a class is not Entity, it does not have to fulfill all the requirements set for Entity (for example, it may not contain a primary key).

Such a class cannot be used in EntityManager or Query operations. Such a class should be marked with the MappedSuperclass annotation or, respectively, described in the XML file.

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Ques 27. On each of the four statuses of Entity objects, how are the operations persisted?

  • For the new status, the object will get saved to the database after a transaction is committed and changes to the status managed.
  • If the status is managed, it ignores the operation. But the status of the dependent Entity can be changed to 'managed' if the cascading annotations are there.
  • For the removed status, it changes to managed thereafter.
  • For the detached status, it throws the exception at the transaction's commit stage or right away.

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Ques 28. What are the effects on the statuses of Entity objects of the merge operation?

  • For the new status, a new managed entity is created, and the past data will be copied into it.
  • For the managed status, it ignores the operation, but it works on the Entity dependent on cascading when the status is not managed.
  • For the removed status, it throws the exception at the transaction's commit stage or right away.
  • For the detached status, it either creates a new managed with the data copied or copies the data to the existing managed Entity

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Ques 29. What are the effects on the statuses of Entity objects of the remove operation?

  • For the new status, it ignores the operation, but the status changes to removed on the Entity dependent on cascading. Here the status shouldn't be managed.
  • For the managed status, the status changes to removed thereafter, and the removed database records the object during the commit stage.
  • For the removed status, it ignores the operation.
  • For the detached status, it throws the exception at the transaction's commit stage or right away.

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Ques 30. What are the effects on the statuses of Entity objects of the detach operation?

  • For the new or detached status, it ignores the operation.
  • For the managed or removed status, the Entity's status and also of the objects dependent on cascade become detached.

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Ques 31. What are the effects on the statuses of Entity objects of the refresh operation?

  • For the new, detached, or removed status, it throws out the exception.
  • For the managed status, it restores all the changes from the database and refreshes all objects dependent on the cascade.

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Ques 32. Mention the types of cache in JPA and their use.

There are two types of cache in JPA:

  • First-level cache: Data is cached from a single transaction.
  • Second-level transaction: Data is cached from more than one transaction.

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Ques 33. What is the purpose of access annotation?

The access type for an entity class, embeddable, superclass, or individual attributes is defined by it. This defines the way JPA refers to entity attributes such as class properties or class fields having setters and getters.

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Ques 34. What is the purpose of Basic annotation?

The simplest type of mapping of data on a column of the database is indicated by the basic annotation.

Also, the fetch field access strategy, as well as the requirement of the field, can be specified in the annotation parameters.

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Ques 35. List the six types of locks available in JPA specification in ascending order.

The six types of locks are listed below in the ascending order of their reliability:

  • NONE
  • OPTIMISTIC
  • OPTIMISTIC_FORCE_INCREMENT
  • PESSIMISTIC_READ
  • PESSIMISTIC_WRITE
  • PESSIMISTICI

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Ques 36. What options does JPA provide to set a second-level cache, or what values can be taken from the persistence.xml by the shared-cache-mode element?

The following five options are there:

  • ALL
  • NONE
  • ENABLE_SELECTIVE
  • DISABLE_SELECTIVE
  • UNSPECIFIED

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Ques 37. How can the JPA metadata that is the information about entity type, embeddable class, etc., be obtained?

The Metamodel interface is used by JPA for this purpose.

We can obtain this interface's object using the method of getMetamodel from an EntityManger or EntityMangerFactory.

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Ques 38. What is a unique inheritance strategy not present in the JPA specification but present in Hibernate?

The implicit polymorphism strategy is present in Hibernate but it is not present in JPA.

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Ques 39. What do you mean by JPQL (Java Persistence query language), and how does it differ from SQL?

  • JPQL is almost similar to SQL, but the names of entity classes and attributes are used instead of the database columns.
  • Also, the data types of entity attributes are used by the query parameters instead of database fields.
  • There is automatic polymorphism in JPQL, unlike SQL. KEY, TREAT, VALUE, MAP, and ENTRY are some of the unique functions of JPQL.

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Ques 40. What is polymorphism in JPQL queries?

This means that regardless of the inheritance strategy, the objects of all the descendant classes are returned in each entity request.

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Ques 41. How can the polymorphism be turned off in JPQL?

We can use the TYPE function in the where condition for turning polymorphism off in JPQL.

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JDBC vs JPAJPA vs Hibernate

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PySpark interview questions and answers - Total 30 questions
Flask interview questions and answers - Total 40 questions
PyTorch interview questions and answers - Total 25 questions
Data Science interview questions and answers - Total 23 questions
SciPy interview questions and answers - Total 30 questions
Generative AI interview questions and answers - Total 30 questions
NumPy interview questions and answers - Total 30 questions
Python interview questions and answers - Total 106 questions
Oracle interview questions and answers - Total 34 questions
MongoDB interview questions and answers - Total 27 questions
Entity Framework interview questions and answers - Total 46 questions
AWS DynamoDB interview questions and answers - Total 46 questions
MySQL interview questions and answers - Total 108 questions
Data Modeling interview questions and answers - Total 30 questions
Redis Cache interview questions and answers - Total 20 questions
DBMS interview questions and answers - Total 73 questions
MariaDB interview questions and answers - Total 40 questions
Apache Hive interview questions and answers - Total 30 questions
SSIS interview questions and answers - Total 30 questions
PostgreSQL interview questions and answers - Total 30 questions
SQL Query interview questions and answers - Total 70 questions
Teradata interview questions and answers - Total 20 questions
SQLite interview questions and answers - Total 53 questions
Cassandra interview questions and answers - Total 25 questions
Neo4j interview questions and answers - Total 44 questions
MSSQL interview questions and answers - Total 50 questions
OrientDB interview questions and answers - Total 46 questions
SQL interview questions and answers - Total 152 questions
Data Warehouse interview questions and answers - Total 20 questions
IBM DB2 interview questions and answers - Total 40 questions
Data Mining interview questions and answers - Total 30 questions
Elasticsearch interview questions and answers - Total 61 questions
VLSI interview questions and answers - Total 30 questions
Digital Electronics interview questions and answers - Total 38 questions
Software Engineering interview questions and answers - Total 27 questions
MATLAB interview questions and answers - Total 25 questions
Civil Engineering interview questions and answers - Total 30 questions
Electrical Machines interview questions and answers - Total 29 questions
Data Engineer interview questions and answers - Total 30 questions
AutoCAD interview questions and answers - Total 30 questions
Robotics interview questions and answers - Total 28 questions
Power System interview questions and answers - Total 28 questions
Electrical Engineering interview questions and answers - Total 30 questions
Verilog interview questions and answers - Total 30 questions
TIBCO interview questions and answers - Total 30 questions
Informatica interview questions and answers - Total 48 questions
Oracle CXUnity interview questions and answers - Total 29 questions
Web Services interview questions and answers - Total 10 questions
Salesforce Lightning interview questions and answers - Total 30 questions
Power BI interview questions and answers - Total 24 questions
IBM Integration Bus interview questions and answers - Total 30 questions
OIC interview questions and answers - Total 30 questions
Dell Boomi interview questions and answers - Total 30 questions
Web API interview questions and answers - Total 31 questions
Salesforce interview questions and answers - Total 57 questions
IBM DataStage interview questions and answers - Total 20 questions
Talend interview questions and answers - Total 34 questions
Java 15 interview questions and answers - Total 16 questions
Core Java interview questions and answers - Total 306 questions
Java Multithreading interview questions and answers - Total 30 questions
Apache Wicket interview questions and answers - Total 26 questions
JBoss interview questions and answers - Total 14 questions
Log4j interview questions and answers - Total 35 questions
Java Mail interview questions and answers - Total 27 questions
Java Applet interview questions and answers - Total 29 questions
Google Gson interview questions and answers - Total 8 questions
Java 21 interview questions and answers - Total 21 questions
Struts interview questions and answers - Total 84 questions
RMI interview questions and answers - Total 31 questions
Apache Camel interview questions and answers - Total 20 questions
Java Support interview questions and answers - Total 30 questions
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JSP interview questions and answers - Total 49 questions
Java Concurrency interview questions and answers - Total 30 questions
J2EE interview questions and answers - Total 25 questions
JUnit interview questions and answers - Total 24 questions
Java OOPs interview questions and answers - Total 30 questions
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JDBC interview questions and answers - Total 27 questions
Java 11 interview questions and answers - Total 24 questions
Java Garbage Collection interview questions and answers - Total 30 questions
Spring Framework interview questions and answers - Total 53 questions
Java Swing interview questions and answers - Total 27 questions
Java Design Patterns interview questions and answers - Total 15 questions
JPA interview questions and answers - Total 41 questions
Hibernate interview questions and answers - Total 52 questions
JMS interview questions and answers - Total 64 questions
JSF interview questions and answers - Total 24 questions
Java 8 interview questions and answers - Total 30 questions
Java 17 interview questions and answers - Total 20 questions
Servlets interview questions and answers - Total 34 questions
EJB interview questions and answers - Total 80 questions
Java Beans interview questions and answers - Total 57 questions
Java Exception Handling interview questions and answers - Total 30 questions
Spring Boot interview questions and answers - Total 50 questions
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ITIL interview questions and answers - Total 25 questions
Finance interview questions and answers - Total 30 questions
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JIRA interview questions and answers - Total 30 questions
SAP ABAP interview questions and answers - Total 24 questions
SCCM interview questions and answers - Total 30 questions
Tally interview questions and answers - Total 30 questions
iOS interview questions and answers - Total 52 questions
Ionic interview questions and answers - Total 32 questions
Android interview questions and answers - Total 14 questions
Mobile Computing interview questions and answers - Total 20 questions
Xamarin interview questions and answers - Total 31 questions
DevOps interview questions and answers - Total 45 questions
Algorithm interview questions and answers - Total 50 questions
Splunk interview questions and answers - Total 30 questions
Accounting interview questions and answers - Total 30 questions
Business Analyst interview questions and answers - Total 40 questions
SSB interview questions and answers - Total 30 questions
OSPF interview questions and answers - Total 30 questions
Sqoop interview questions and answers - Total 30 questions
JSON interview questions and answers - Total 16 questions
Accounts Payable interview questions and answers - Total 30 questions
IoT interview questions and answers - Total 30 questions
Computer Graphics interview questions and answers - Total 25 questions
Insurance interview questions and answers - Total 30 questions
Scrum Master interview questions and answers - Total 30 questions
XML interview questions and answers - Total 25 questions
Bitcoin interview questions and answers - Total 30 questions
Laravel interview questions and answers - Total 30 questions
GraphQL interview questions and answers - Total 32 questions
Active Directory interview questions and answers - Total 30 questions
Microservices interview questions and answers - Total 30 questions
Adobe AEM interview questions and answers - Total 50 questions
Tableau interview questions and answers - Total 20 questions
Apache Kafka interview questions and answers - Total 38 questions
Kubernetes interview questions and answers - Total 30 questions
OOPs interview questions and answers - Total 30 questions
PHP OOPs interview questions and answers - Total 30 questions
Desktop Support interview questions and answers - Total 30 questions
Fashion Designer interview questions and answers - Total 20 questions
IAS interview questions and answers - Total 56 questions
Nursing interview questions and answers - Total 40 questions
Dynamic Programming interview questions and answers - Total 30 questions
Linked List interview questions and answers - Total 15 questions
CICS interview questions and answers - Total 30 questions
SharePoint interview questions and answers - Total 28 questions
Yoga Teachers Training interview questions and answers - Total 30 questions
Behavioral interview questions and answers - Total 29 questions
Language in C interview questions and answers - Total 80 questions
School Teachers interview questions and answers - Total 25 questions
Digital Marketing interview questions and answers - Total 40 questions
Statistics interview questions and answers - Total 30 questions
Apache Spark interview questions and answers - Total 24 questions
Full-Stack Developer interview questions and answers - Total 60 questions
VISA interview questions and answers - Total 30 questions
IIS interview questions and answers - Total 30 questions
System Design interview questions and answers - Total 30 questions
Cloud Computing interview questions and answers - Total 42 questions
Google Analytics interview questions and answers - Total 30 questions
ANT interview questions and answers - Total 10 questions
BPO interview questions and answers - Total 48 questions
SEO interview questions and answers - Total 51 questions
HR Questions interview questions and answers - Total 49 questions
Control System interview questions and answers - Total 28 questions
Agile Methodology interview questions and answers - Total 30 questions
Content Writer interview questions and answers - Total 30 questions
SAS interview questions and answers - Total 24 questions
REST API interview questions and answers - Total 52 questions
Blockchain interview questions and answers - Total 29 questions
Mainframe interview questions and answers - Total 20 questions
Checkpoint interview questions and answers - Total 20 questions
Hadoop interview questions and answers - Total 40 questions
Banking interview questions and answers - Total 20 questions
Technical Support interview questions and answers - Total 30 questions
Sales interview questions and answers - Total 30 questions
Chemistry interview questions and answers - Total 50 questions
Nature interview questions and answers - Total 20 questions
Docker interview questions and answers - Total 30 questions
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SDLC interview questions and answers - Total 75 questions
RPA interview questions and answers - Total 26 questions
Cryptography interview questions and answers - Total 40 questions
College Teachers interview questions and answers - Total 30 questions
Memcached interview questions and answers - Total 28 questions
GIT interview questions and answers - Total 30 questions
Blue Prism interview questions and answers - Total 20 questions
JCL interview questions and answers - Total 20 questions
JavaScript interview questions and answers - Total 59 questions
Ajax interview questions and answers - Total 58 questions
Express.js interview questions and answers - Total 30 questions
Ansible interview questions and answers - Total 30 questions
ES6 interview questions and answers - Total 30 questions
Electron.js interview questions and answers - Total 24 questions
NodeJS interview questions and answers - Total 30 questions
RxJS interview questions and answers - Total 29 questions
jQuery interview questions and answers - Total 22 questions
ExtJS interview questions and answers - Total 50 questions
Vue.js interview questions and answers - Total 30 questions
Svelte.js interview questions and answers - Total 30 questions
Shell Scripting interview questions and answers - Total 50 questions
Next.js interview questions and answers - Total 30 questions
TypeScript interview questions and answers - Total 38 questions
Knockout JS interview questions and answers - Total 25 questions
Terraform interview questions and answers - Total 30 questions
PowerShell interview questions and answers - Total 27 questions
Ethical Hacking interview questions and answers - Total 40 questions
Cyber Security interview questions and answers - Total 50 questions
PII interview questions and answers - Total 30 questions
Data Protection Act interview questions and answers - Total 20 questions
BGP interview questions and answers - Total 30 questions
Tomcat interview questions and answers - Total 16 questions
Glassfish interview questions and answers - Total 8 questions
Ubuntu interview questions and answers - Total 30 questions
Linux interview questions and answers - Total 43 questions
Unix interview questions and answers - Total 105 questions
Weblogic interview questions and answers - Total 30 questions
QTP interview questions and answers - Total 44 questions
Cucumber interview questions and answers - Total 30 questions
TestNG interview questions and answers - Total 38 questions
Postman interview questions and answers - Total 30 questions
SDET interview questions and answers - Total 30 questions
Quality Assurance interview questions and answers - Total 56 questions
Mobile Testing interview questions and answers - Total 30 questions
Kali Linux interview questions and answers - Total 29 questions
UiPath interview questions and answers - Total 38 questions
Selenium interview questions and answers - Total 40 questions
API Testing interview questions and answers - Total 30 questions
Appium interview questions and answers - Total 30 questions
ETL Testing interview questions and answers - Total 20 questions
CSS interview questions and answers - Total 74 questions
Ruby On Rails interview questions and answers - Total 74 questions
Yii interview questions and answers - Total 30 questions
Angular interview questions and answers - Total 50 questions
PHP interview questions and answers - Total 27 questions
Oracle JET(OJET) interview questions and answers - Total 54 questions
Frontend Developer interview questions and answers - Total 30 questions
Zend Framework interview questions and answers - Total 24 questions
RichFaces interview questions and answers - Total 26 questions
HTML interview questions and answers - Total 27 questions
Flutter interview questions and answers - Total 25 questions
CakePHP interview questions and answers - Total 30 questions
React Native interview questions and answers - Total 26 questions
React interview questions and answers - Total 40 questions
Web Developer interview questions and answers - Total 50 questions
Angular JS interview questions and answers - Total 21 questions
Angular 8 interview questions and answers - Total 32 questions
Dojo interview questions and answers - Total 23 questions
Symfony interview questions and answers - Total 30 questions
GWT interview questions and answers - Total 27 questions
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