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If IntelliJ IDEA is showing a “can’t find symbol” error for a boolean field when using getter/setter annotations (like Lombok’s @Getter and @Setter), here are a few possible causes and solutions:

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1. Check Lombok Plugin & Enable Annotation Processing

If you’re using Lombok, ensure the plugin is installed and annotation processing is enabled:

Step 1: Install Lombok Plugin

1. Open IntelliJ IDEA.
2. Go to Preferences (⌘ ,) > Plugins.
3. Search for Lombok and install it if not already installed.
4. Restart IntelliJ.

Step 2: Enable Annotation Processing

1. Open Preferences (⌘ ,) > Build, Execution, Deployment > Compiler > Annotation Processors.
2. Check Enable annotation processing.
3. Click Apply > OK and restart IntelliJ.

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2. Rebuild the Project

Sometimes IntelliJ does not recognize generated code. Try these steps:

1. Invalidate Cache & Restart
   • Go to File > Invalidate Caches / Restart > Invalidate and Restart.
2. Rebuild the project
   • Use ⌘ F9 (Command + F9) or go to Build > Rebuild Project.

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3. Check Field Naming and Lombok Behavior

Lombok follows JavaBean naming conventions, which may cause issues with boolean fields.

Issue: Boolean Field Starts with “is”

If your field is named isActive:

@Getter
@Setter
private boolean isActive;

Lombok does not generate getIsActive(). Instead, it generates isActive(), which can cause issues.

Solution: Rename the Field

Change it to:

@Getter
@Setter
private boolean active;  // Lombok will generate getActive() and setActive()

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4. Check Dependencies (For Lombok Users)

Ensure you have Lombok dependency in pom.xml (Maven) or build.gradle (Gradle):

For Maven (pom.xml)

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.18.30</version>
    <scope>provided</scope>
</dependency>

For Gradle (build.gradle)

dependencies {
    compileOnly 'org.projectlombok:lombok:1.18.30'
    annotationProcessor 'org.projectlombok:lombok:1.18.30'
}

Then reload the project (⌘ ⇧ I in IntelliJ for Maven/Gradle).

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5. Manually Define Getters/Setters

If Lombok isn’t working, manually define getters and setters:

private boolean isActive;

public boolean isActive() {
    return isActive;
}

public void setActive(boolean active) {
    this.isActive = active;
}

If it works manually but not with Lombok, the issue is with Lombok configuration.

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Final Step: Check Compilation Errors

Run:

mvn clean compile

or

./gradlew clean build

If the error still persists, share the exact field and annotation you’re using!

45-Minute Java, Spring Boot, and React.js Profile Interview Plan

Objective:

To assess the candidate’s technical expertise, problem-solving skills, coding ability, and knowledge of Java, Spring Boot, and React.js within 45 minutes.

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1. Introduction (2-3 Minutes)

• Interviewer Introduction: Briefly introduce yourself and the company.
• Candidate Introduction: Ask the candidate to introduce themselves, focusing on their experience in Java, Spring Boot, and React.js.
• Agenda Overview: Explain the structure of the interview:
  • Core Java
  • Spring Boot
  • React.js
  • Practical Scenario
  • Questions & Closing

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2. Core Java Questions (10 Minutes)

Focus on concepts relevant to backend development.

1. Object-Oriented Programming:
   • Explain the principles of OOP.
   • Difference between abstract class and interface.
2. Java Fundamentals:
   • Explain HashMap vs TreeMap.
   • What is the significance of the final keyword?
3. Multithreading & Concurrency:
   • How do you implement multithreading in Java?
   • What is the difference between synchronized and Lock?
4. Memory Management:
   • Explain Garbage Collection in Java.
   • How to handle memory leaks?
5. Java 8 Features:
   • Explain the use of Streams and Optional.
   • What are functional interfaces and lambdas?

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3. Spring Boot Questions (10 Minutes)

Dive into the backend framework knowledge.

1. Framework Basics:
   • Explain Dependency Injection.
   • What is the purpose of @RestController, @Service, and @Repository annotations?
2. Spring Boot Concepts:
   • What are the advantages of using Spring Boot?
   • How does Spring Boot manage configurations (e.g., application.properties)?
3. APIs and Microservices:
   • Explain the difference between a monolithic and microservices architecture.
   • How do you secure REST APIs in Spring Boot?
4. Database Integration:
   • How do you use Spring Data JPA to interact with a database?
   • What is the difference between save() and saveAndFlush() in JPA?
5. Testing:
   • How do you write unit tests for Spring Boot applications?

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4. React.js Questions (10 Minutes)

Focus on frontend development knowledge.

1. React Basics:
   • What is the difference between functional and class components?
   • Explain the purpose of useState and useEffect hooks.
2. Component Lifecycle:
   • What are React lifecycle methods?
   • How do you optimize React performance?
3. State Management:
   • What is the difference between local state and global state?
   • How would you use Redux or Context API in a React app?
4. React and APIs:
   • How do you fetch data in React?
   • Explain error handling while fetching data from an API.
5. Advanced React:
   • What is lazy loading in React?
   • How do you handle form validation in React?

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5. Practical Scenario (15 Minutes)

Ask the candidate to solve a real-world problem to assess their coding and problem-solving skills.

Backend Task (Spring Boot):

• Write a REST API to manage a list of tasks.
  • Endpoints: Add task, update task, delete task, get all tasks.
  • Use an in-memory database (e.g., H2).
  • Bonus: Add validation for input data.

Frontend Task (React):

• Create a React component to display a list of tasks fetched from the above API.
  • Add a button to mark a task as completed.
  • Bonus: Show a loading spinner while fetching data.

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6. Questions and Closing (2-3 Minutes)

• Allow the candidate to ask any questions about the role, team, or company.
• Provide feedback on their performance (if possible) or let them know the next steps.

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Notes for the Interviewer:

• Time management is crucial; keep track of time for each section.
• Focus on practical knowledge and problem-solving ability over theoretical knowledge.
• Evaluate communication skills, as clear explanations are crucial for teamwork.

Good luck with the interview!

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