Perficient AEM Developer Interview Questions and Answers

Q1. Given an array of non-negative integers.Find the length of the longest subsequence such that elements in the subsequence are contiguous integers. The consecutive numbers can be in any order. Example n=7 nu...read more
Ans. 
Find the length of the longest subsequence of contiguous integers in an array.
• Sort the array

• Iterate through the array and check for consecutive integers

• Keep track of the longest subsequence found
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Q2. Get list of pincodes from these objects Employee{ id Long, name String, Addresses : List
} Addresses{ houseNo long, pindcode long, state String, country String, } Ans. Use flatMap to flatten and then use m...read more
Ans. 
Use flatMap and map to extract list of pincodes from Employee objects
• Use flatMap to flatten the list of Addresses in each Employee object

• Use map to iterate over the flattened list and extract the pincodes

• Example: employeeList.stream().flatMap(emp -> emp.getAddresses().stream()).map(address -> address.getPincode()).collect(Collectors.toList())
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Q3. What is Database Pooling, Hikari and its configurations. Java 8 to current enchancements and current java version Factory and Builder design patterns to explain and code Project expalantion and details, Cr...read more
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Database pooling is a technique used to manage a pool of database connections for efficient resource utilization. HikariCP is a popular database connection pooling library in Java.
• HikariCP is a high-performance database connection pooling library for Java applications.

• It is known for its low latency and high throughput.

• Configurations for HikariCP include settings such as maximum pool size, connection timeout, and idle ...read more
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Q1. What is LMS ?
Ans. 
LMS stands for Learning Management System, a software application for the administration, documentation, tracking, reporting, and delivery of educational courses or training programs.
• LMS helps organizations deliver online courses and training programs to employees or students.

• It allows for the creation and management of courses, assessments, and learning materials.

• LMS can track learner progress, generate reports, and p...read more
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Q2. What is shadow DOM
Ans. 
Shadow DOM is a way to encapsulate the styling and structure of a web component, preventing styles from leaking out or clashing with the rest of the page.
• Shadow DOM allows for creating self-contained components with their own styles and markup

• It helps in preventing styles from the main document affecting the component and vice versa

• Shadow DOM can be created using the 'shadowRoot' property of an element
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Q1. What all exceptions you know ?
Ans. 
Some common exceptions in Salesforce development include DMLException, QueryException, and LimitException.
• DMLException: Thrown when an error occurs while performing DML operations like insert, update, delete.

• QueryException: Thrown when an error occurs while querying data from the database.

• LimitException: Thrown when governor limits are exceeded, such as SOQL query limit or CPU time limit.
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Q2. Have you worked on integration ?
Ans. 
Yes, I have worked on integration in Salesforce development.
• I have experience integrating Salesforce with external systems using REST and SOAP APIs.

• I have worked on integrating Salesforce with third-party applications like MailChimp and DocuSign.

• I have implemented custom integrations using tools like Salesforce Connect and MuleSoft.

• I have experience with data mapping, transformation, and synchronization during integrat
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Q1. Why governor limits ?
Ans. 
Governor limits are in place to ensure efficient use of resources and prevent abuse in Salesforce platform.
• Governor limits help in maintaining system performance and preventing monopolization of resources.

• They ensure fair usage of resources among all users on the platform.

• Examples include limits on number of records retrieved in a single query, number of SOQL queries executed, and CPU time consumed.

• Governor limits also...read more
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Q2. What is challenge you faced ?
Ans. 
One challenge I faced was integrating a third-party API with Salesforce.
• Had to understand the API documentation thoroughly

• Encountered compatibility issues with Salesforce platform

• Implemented custom code to bridge the gap between API and Salesforce
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Q1. Context api, js related qstns, simple programming qstn,
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Q2. Remove duplicates without using set.
Ans. 
Remove duplicates from array of strings without using set.
• Iterate through the array and compare each element with all other elements to find duplicates.

• Create a new array and add elements only if they are not already present in the new array.
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Q1. Functional Programming in Java,Oops Concepts
Ans. 
Functional programming in Java focuses on using functions to perform tasks, while OOPs concepts revolve around classes and objects.
• Functional programming in Java involves using higher-order functions, lambda expressions, and streams to process data.

• OOPs concepts in Java include inheritance, encapsulation, polymorphism, and abstraction.

• Functional programming promotes immutability and avoids side effects, while OOPs allo...read more
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Q2. Spring boot related questions
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Q3. Functional Programming in java
Ans. 
Functional programming in Java focuses on using functions to perform operations on data, emphasizing immutability and avoiding side effects.
• Uses higher-order functions like map, filter, and reduce to manipulate data

• Emphasizes immutability to avoid side effects

• Encourages declarative programming style

• Leverages lambda expressions and streams for concise code

• Example: Using map to transform a list of integers
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Q1. Basic Java Question
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Q2. Spring Boot related questions
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Q1. Design a rest API and code it.
Ans. 
Design and code a REST API for a software developer interview.
• Define the endpoints and HTTP methods for the API (e.g. GET /users, POST /users)

• Implement authentication and authorization mechanisms (e.g. JWT tokens)

• Use proper status codes for responses (e.g. 200 OK, 401 Unauthorized)

• Include error handling and validation for input data

• Document the API using tools like Swagger or OpenAPI
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Q2. Questions related to JPA HIBERNATE SQL
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Q1. Discussion related to Last company Project and architecture level questions
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Q2. Write code to calculate frequency of a word using Stream API and lambda expressions
Ans. 
Calculate word frequency using Stream API and lambda expressions
• Use Stream API to convert array of strings to stream

• Use Collectors.groupingBy to group words by their frequency

• Use Collectors.counting to count the occurrences of each word
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Q1. How annotation works?
Ans. 
Annotations in Java provide metadata about a program that can be used by the compiler or at runtime.
• Annotations start with the @ symbol.

• Annotations can be used to provide information to the compiler or to runtime environments.

• Annotations can be used to define custom metadata for classes, methods, fields, etc.

• Annotations can also be used for code generation, documentation, and validation.

• Examples of annotations in Java ...read more
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Q2. CondurentSkipListMap, how does it work
Ans. 
ConcurrentSkipListMap is a concurrent, sorted map implementation in Java.
• ConcurrentSkipListMap is a concurrent version of SkipListMap, which is a sorted map implementation based on skip list data structure.

• It allows multiple threads to access and modify the map concurrently.

• It provides logarithmic time complexity for most operations, making it efficient for concurrent access.

• Example: ConcurrentSkipListMap
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20 aptitude,20 comunication,4 program questions

General topics . topics about online class vs office line class

Q1. In this round also they mainly check communication.after that basic questions about the what you put on your resume
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Q1. General round. In this round they told about the company and bond
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Q1. Explain exceptional handling
Ans. 
Exception handling is a mechanism to handle runtime errors in a program.
• Exception handling helps in gracefully handling unexpected errors in a program.

• It prevents the program from crashing and allows for proper error logging and recovery.

• Commonly used keywords in exception handling are try, catch, finally, and throw.

• Example: try { // code that may throw an exception } catch(Exception ex) { // handle the exception }
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Q2. Explain difference between abstract and interfaces
Ans. 
Abstract classes can have implementation details while interfaces cannot.
• Abstract classes can have both abstract and non-abstract methods, while interfaces can only have abstract methods.

• A class can only inherit from one abstract class, but can implement multiple interfaces.

• Abstract classes can have constructors, fields, and properties, while interfaces cannot.

• Abstract classes are used when some common functionality ne...read more
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Q3. One coding question on arrays
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