#spring boot annotations

[deepzignuts]

Discover the top 10 essential annotations in Spring Boot that every developer should know to streamline their workflow and enhance application performance. Learn how these powerful tools can simplify coding and boost productivity. Check out the full list here.

[maruful009]

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[forresttfirre]

— the “informant” (jason todd x reader)

Summary: You mark up one of Jason's case files, and it slips both of your minds the next day. So, when Jason brings the file with him to the cave, everyone quickly catches on to the fact that Jason is working with someone. He's able to pass it off as just an informant, but one sibling stumbles upon the truth. Word count: 1.1k

Jason lands as quietly as possible on the fire escape attached to his apartment — top floor corner, adjacent to an alley with almost zero lighting and a building with no windows. Great for a vigilante at least.

He crouches down by the window, pressing a disguised button to disable the alarm attached. After the soft popping sound, he pushes up the window and steps through into his apartment. His boots land on scuffed hardwood with a thud and he quickly shuts the window, turning the alarm back on while doing so.

The apartment is silent besides the soft rush of air coming from the air conditioner. As he moves into his kitchen, he hears a mug be placed on the counter gently, then the scratch of a pen against paper. A small fond smile forms on his face, hidden by his helmet, which he takes off as he passes through the archway.

You're sitting at the counter, a cup of tea to your right and a file in front of you. "You snoopin' through my stuff now?" He teases. You pick up your head just the slightest, and he can make out your sheepish smile. "You seemed a little stumped, thought I could offer my expertise." Jason is reminded of the past you once held, following your "mentor" around the world as they battled assassins and the like. You had a similar life to him, but you left your cape behind for a new start in Gotham of all places. He got lucky meeting you.

Jason watches as you twirl a glittery, purple gel pen in between your fingers. He silently removes the rest of his getup as you return to making small notes in the margins of the case profile. Being with you is easy, because sometimes his presence in the room is enough. No words have to be exchanged even as time passes.

He peels off his mask and washes away the 'glue' on his face. Jason can feel your eyes on him, watching as he shrugs off his leather jacket, then his gloves. "You joining me?" He asks when he turns around, tipping his head toward the hallway that leads to the bathroom. Sometimes, when he arrives home and you're awake, you'll join him in the shower. It's never anything sexual, but relaxing nonetheless; with your hands gentle as you run the soap through his hair, and your soft words. "Mmm...sure. I'm about done, anyway." You slip off the stool silently, closing the file before stretching your arms above your head.

A moment later, Jason is in front of you, placing a kiss on your temple, your cheek. "I think they might be selling to Scarecrow, some of the chemicals are similar to what he's been using lately." Jason groans at your statement and his head falls to lean against your shoulder. "Not now, I do not need more motivation to go back out there."

"Later, then."

Later never comes; Jason picks up a shift at the auto shop near the edge of Park Row, and you go into work as you usually do. He completely forgets about your 'annotations', so he brings the file with him when he visits the cave later that night.

"Since when do you own a glitter pen?" Tim teases from his spot by the computer, Jason's file open in front of him. "What— Gimme it." Jason springs forward, memories from the previous night coming back to him. Tim quickly grabs the papers, holding them in the air and leaving the manila file folder on the desk.

"What's going on?" Steph questions, eyes narrowed as Tim stands on his chair to get a height advantage over Jason. "Todd uses a glitter pen." Damian rolls his eyes before going back to sparring against a hologram.

"It's purple," Tim grins and laughs as Steph gasps dramatically. "You do like purple! I knew it!"

"I do not! Give me the file, replacement. I'm serious." Jason wraps his arm around Tim, pulling off the chair and into his arms. Tim squirms, then falls to the floor with the papers still in his hands. He scrambles up quickly, and extends his staff. "This isn't your handwriting...you're working with someone!" Tim exclaims, poking Jason away from him as he quickly reads through the top paper.

"Jason, we should talk before you let anyone else read our case files," Bruce comments as he easily grabs the papers from Tim's hands. "I'm not working with anyone," Jason grumbles, rolling his eyes behind his mask. However, his cheeks are red hot, thankfully hidden by his helmet.

Dick peers over Bruce's shoulder, reading as well. "Tim's right though, this isn't your handwriting," He grins brightly, walking over to Jason with a giddy smile. "Did you make a new friend, Little Wing?" Jason can hear Steph and Tim laugh in the background as he groans.

"It's— They're just an informant, I did background checks and I've known them for a bit. I trust them." Everyone goes quiet for a bit, staring at him like it's hard to believe that he'd let anyone else get that close. "That's good," Dick comments, and everyone murmurs their agreements. It's awkward, because they still step around like he'll snap at them any second.

"I'm leaving." He stomps over to his bike, the engine roaring loudly as he starts it up. There's eyes on his back until he's out of the cave.

After Bruce and Tim read through the papers annotated by Jason's informant, Cass grabs them. Tim had taken pictures to try and analyze the handwriting, and she could see Bruce's silent questions about who the informant could be. Whoever Jason gave the file had insight even Tim missed the first time, and they added funny little comments on the side. When she goes to put the papers back in the file folder, she finds a sticky note on the inside in the same glittery purple pen. You're welcome Jay; I <3 U :).

Cass smiles softly, taking out the sticky note carefully and putting the papers back. When she goes out, she starts in Crime Alley first, even if it's Jason's territory. He finds her quickly.

"What're you doing here, Bat?" Jason asks, arms crossed over his chest. Cass opens one of the pockets on her belt, and pulls out the sticky note. She unfolds it before handing it to Jason. He reads it, then quickly looks at Cass again. "You didn't show anyone, did you?"

She shakes her head and Jason sighs in relief. "Thanks." Cass nods before leaving the rooftop just as fast as she came.

Jason folds the note back up with a smile. He'll have to delete some of his mask footage tonight.

my first time writing for jason, i hope you enjoy ☺️

[adastri]

Environmental Science in Academia

I often see posts about how STEM pursuits are underrepresented in the dark academia community, but as an environmental science student I get disappointed when the only sciences talked about are bio, chem, and physics. So, I decided I’d take matters into my own hands! Below is a non-comprehensive list of things you could romanticize about life as an environmental major.

(Disclaimer: some sustainable practices are also included, because of course they must be)

Airy button down tops tucked into cargo pants for field work, hair pulled back hastily to get a closer look at the specimen your professor is pointing to.

Piles of case studies and research papers stacked on your desk, the already-read ones covered in annotations

Using vintage/old technology because it’s more sustainable and cheaper to buy secondhand (plus it adds to the aesthetic—wired headphones, anyone?)

Rushing into the lab a minute late, coffee in hand, long coat billowing behind you.

Studying outdoors when the weather permits, and by a window when it doesn’t. Nature inspires you, and you make a point to get out into it as much as possible.

Thrifting clothes at your campus’s donation center (because you obviously picked a school with its sustainability priorities in order)

Reading Silent Spring by Rachel Carson; rereading it over and over, the margins now gray with pencil annotations.

Trying to identify trees as you walk across campus.

A well-worn, but sturdy, pair of lace up boots that can withstand the elements, worn with slacks and a spotless knit sweater.

Classical music while you work on research.

Pressing leaves and flowers between the pages of your books and textbooks for the next reader to discover.

Attending climate protests in the nearest city, and bringing a carefully crafted sign to hold.

Biking everywhere.

Watching nature documentaries with your friends, seeing who can do the best David Attenborough impression.

A bedroom full of plants so you can continue your personal studies and observations outside of the lab.

Scolding your friends who smoke because you’ve studied air pollution and you can list every disease smoking causes.

Closing yourself and your lab group in a small room with a humidifier to measure air quality for a lab. Later wondering whether you all just inhaled mold because the lab results showed that indoor particulate matter increases with humidity. (It should be fine… right?)

Drawing out diagrams of specimens, food webs and nutrient cycles in your notes.

Feel free to add anything else that suits your fancy!

[belanekra]

Interesting annotations on Acceptance by Jeff Vandermeer (part two)

From genius.com. I am fascinated by Cheney's fictional novel about Control. Like, what the hell man?

Once there had been biologists here, in numbers so great that the forgotten coast shook with the aftermath of their passage. These men and women bestrode the terrain like conquerors, sent by government money in the form, it was rumored, of gold bars well-hidden that could not devalue or decay like the money kept in banks. They were thus ungoverned by the dictates of barter or of neighborly responsibility that had bound this place for so long.

In the summer of that first year they established their headquarters in the ruins of the ghost town, a bivouac of scientists unprecedented for that place even when it had been alive. As they spread out across their migratory range, the biologists as observed by the locals began to carry out a series of arcane rituals. They shoved pieces of swamp grasses and bits of bark into vials. They put up tents out in “the field” as they called it, even when it was just black swamp. They used binoculars, scopes, and microscopes. They took readings with innumerable peculiar instruments. At times, they stopped in their labors to swear about the heat and humidity, which did not endear them.

The biologists tagged many living things — at least one of every creature that moved and breathed across the pine forests and the cypress swamp, the salt marshes and the beach. They took fine nylon nets and set up capture zones for songbirds, running clod-stepped to the rescue of what they had themselves endangered. Fragile wings and fragile beaks, heads to the side; small eyes looking up at giants that held their bodies in half-closed fists. They tagged so many things, had brought so many tranq darts, that the blue caps removed from the tips still showed up years later in the marshes, along the river bank or crushed into the gravel of the dirt roads.

In their heyday, at the zenith of their powers, some said their boot prints outnumbered the tracks of deer and raccoons and otters on the salt flats.

But over time, the effort that had quickened slowed, the impulse behind it dulled, and the biologists began to die out. Their mobile tents that had once dotted the camping ground near the lighthouse began to disappear. The sounds of their idle conversations before expeditions in the early morning became muted and infrequent. That last spring there might have been a hundred of them and by the fall only four or five. It was a mass extinction created by lack of grant renewal, a matching funds disaster, and a moving on of government attention, that great eye roving toward other lands and foreign wars.

–from the book Forgotten Coast History and Customs by Berit Ellingsen

-------

“Control indicates certainty about life. I have no certainty, and I wish nothing but to fade into the background, a wish that only ever makes people think of words like ‘wallflower’ because we live in a world where narcissism has been enshrined as a noble pursuit."

“I had no dead twin brother or sister. I had no specific trauma that made me this way. I am not defective, as more than one boyfriend suggested. I simply live apart. I simply have different interests. I simply do not privilege human activity…except when I do.”

–fragments scrawled in the margins of the biologist’s account, and then crossed out

-------

“As Chen…as Control sat there, in the dying warmth, in the mottled courtyard, by himself, finally by himself, he saw a tall, dark outline lit by the setting sun, which had given a dark umber glow to the singed edges of the swamp. He would recognize her outline anywhere by now. Still in her expedition clothes. So close to a gnarled tree that she was hard to see. There was a hardness in the pit of his stomach, and a tightness in his chest, but somehow not the fear. Somehow, Control was not afraid of this apparition.

She stood with her back to the Southern Reach, to the pull of the U, and looked out across the swamp, where Control imagined Area X lay. Just standing there, staring. Or, perhaps, with her eyes closed. Or perhaps she had no eyes. He could not tell from his vantage, and did not care to get closer. Just standing there. This person who should not have been there, this shell of a soul of whom Control had only found fragments. He could not help thinking that she had materialized because of his close study of her, even though he knew this wasn’t true. That he was just lucky enough to get a glimpse of some ongoing phenomenon. That she probably wasn’t real.

He stood at the window for quite a while, watching her from that distance. He thought about sounding the alarm. That occupied his thoughts for some time. Then he thought about going down to her, but he could not quite do that either, could not quite give himself that kind of permission.

Then, hidden by long tree shadows as long and narrows as bars, she began to walk around the edge of the swamp, until she was distant enough that she fell out of sight.

Control realized that his left hand was curled and his fingernails were dragging into his palm. He released, flexed his fingers, examined the angry white curved indentations, fringed flush with pink, that best expressed to him to proof of his anxiety.

The Southern Reach was over. The Southern Reach was done. He couldn’t stay, he realized. It wasn’t really a place he wanted to stay. It wasn’t really his sinking ship; the rest of the world was.

Had Grace seen her? Should he tell Grace he had seen her? Somehow this was the thought that filled him with dread, and not all of the others. For it would not be a mercy. Knowing what he did. So he let her fade into the dusk, and did nothing. He did not call to anyone. He did not try to follow her. He just…let her go, to do whatever she meant to do. That she had been in the world so long already made manifest how futile it would be to ‘contain’ her at this point. Control understood that all of this was unforgiveable. That it was a sighting and a lapse that if ever known would make him unqualified for any position within the agency. But he didn’t care. He didn’t care because now he had to be a selfish and do what he thought was good for him, whether it was or wasn’t."from Mike Cheney’s fiction manuscript about Control

-------

Final report on the linguist assigned to the twelfth expedition, one year after withdrawal from the expedition…

Subject is combative and paranoid when interviewed. Still refuses to admit that she scrubbed herself from the mission, but continues to claim that the former director strongly suggested she stand-down. In direct contradiction of testimony by the assistant director. Subject feels as if she has been “bullied and harassed.” Subject lives by herself, under a different name, says she feels “repatriated with reality, but not in quite the same way as before.” She has only rarely seen her family, and under carefully controlled conditions. A Central agent has followed her everywhere, and she knows this. She may or may not know her house has been bugged.

Subject was terse during the last interview, conducted in her backyard as she tended to her garden. I asked her if she felt free and floating and she said nothing back. Per L’s instructions, I gave her a few more prompts, but no recognition occurred.

The question arises, with no clear answer: Who or what deprogrammed her?

At the end, she handed me a letter she said would answer all of my questions. I was only to open it after I had left. I obeyed this request and opened the letter on the way back to Central.

There was only one word written inside, repeated three times.

“Annihilation.”

-------

“Does Area X have its own Lowry? What would that look like? What would it mean? Or does a Lowry only exist on the human spectrum of possibility?” – scribbled note by the former director

-------

“Control was beginning to get a sense of Whitby’s filthy habits, the way the illogical Whitby had limpet-like attached himself to the Southern Reach rocks. You couldn’t pry him off. God knows, Michael Cheney, the handsome and clearly uber-intelligent science director, had tried. Control had to give Cheney that. The man’s methodology might be eccentric, but what a brain! Not like that mewling Whitby, who for all anyone knew might be roaming the air ducts in imitation of a more dangerous creature. No, Whitby could go to the dogs, but Control thought Cheney might be the go-to guy for a lot of things. Because Control was at sea and Cheney was the captain he was looking for.” – from science director Mike Cheney’s fiction manuscript about Control

-------

“When is a lighthouse not a lighthouse? When it’s a distress beacon. Your focus on the island is a terrible miscue. A fixed attention that blinds you to the periphery–and the periphery is where everything is happening. Only certain member of the S&SB know what’s really happening, what phenomena we are really charting here. You have to give us more authority. You have to let us have more resources. – Henry”

–Note found in the pocket of an unidentifiable man slumped at a piano in the village bar.

-------

“Sometimes I believe Area X is coming in at me through my dreams. Because I don’t believe in dreaming any more. I don’t believe there are such things as images you conjure up at night, while asleep. That’s just another whisper, another way they hack into you, subvert how you think about things. Lord knows, we need subversion–we need it if want water to drink and air to breathe. But did it have to happen quite this way?” – from Whitby Allen’s private journal

-------

[datasciencewithpythonemexo]

Spring Boot Interview Questions: Prepare for Success

Spring Boot has become one of the most popular frameworks in the Java ecosystem, streamlining robust and scalable web application development. Whether you’re a seasoned developer or just getting started, acing a Spring Boot interview can be a significant milestone in your career. To help you prepare effectively, here are the latest Spring Boot interview questions that will test your knowledge and give you a deeper understanding of how the framework works. These questions will be beneficial if you're pursuing a Spring Boot Certification Training Course at eMexo Technologies, in Electronic City Bangalore.

1. What is Spring Boot, and how is it different from Spring Framework?

This is a fundamental question that often appears in Spring Boot interviews. Spring Boot is an extension of the Spring Framework to simplify the development process. It eliminates the need for extensive XML configuration and provides default configurations to facilitate rapid application development. Spring Framework requires developers to configure components manually, while Spring Boot auto-configures them.

By understanding this, you can highlight how Spring Boot training in Electronic City Bangalore at eMexo Technologies helps developers focus more on writing business logic rather than dealing with complex configurations.

2. What are the main features of Spring Boot?

Spring Boot stands out due to several features:

Auto-Configuration: Automatically configures your application based on the libraries on the classpath.

Embedded Servers: It allows the deployment of web applications on embedded servers like Tomcat, Jetty, and Undertow.

Spring Boot Starters: Pre-configured templates that simplify dependency management.

Spring Boot CLI: A command-line interface that allows you to develop Spring applications quickly.

Actuator: Monitors and manages application performance.

These features make Spring Boot an attractive option for developers, which is why the best Spring Boot training institute in Electronic City Bangalore emphasizes hands-on experience with these functionalities.

3. What is the role of @SpringBootApplication in Spring Boot?

The @SpringBootApplication annotation is a core part of Spring Boot, often referred to as the ‘meta-annotation.’ It is a combination of three annotations:

@Configuration: Marks the class as a configuration class for Spring Beans.

@EnableAutoConfiguration: Enables Spring Boot’s auto-configuration feature.

@ComponentScan: Scans the components within the specified package.

This annotation is crucial to understanding Spring Boot’s internal architecture and its ability to simplify configuration.

4. What is Spring Boot Starter, and how is it useful?

A Spring Boot Starter is a set of pre-configured dependencies that simplify the inclusion of libraries in your project. For instance, spring-boot-starter-web includes everything you need for web development, like Spring MVC, embedded Tomcat, and validation support.

Starters save a lot of time, as they eliminate the need to find and include individual dependencies manually. When studying at eMexo Technologies, you’ll get an in-depth look at the variety of Spring Boot Starters available and their importance in building scalable applications.

5. What is a Spring Boot Actuator, and how is it used?

Spring Boot Actuator provides production-ready features to help monitor and manage your Spring Boot application. It offers a wide array of tools like health checks, metrics, and auditing endpoints. The actuator allows you to easily monitor application performance, which is a crucial aspect of microservices-based applications.

6. What are Microservices, and how does Spring Boot help in building them?

Microservices are small, independent services that work together in a larger application. Each service is responsible for a specific business functionality and can be developed, deployed, and maintained independently. Spring Boot simplifies the development of microservices by providing tools like Spring Cloud and Spring Boot Actuator.

7. How does Spring Boot handle dependency injection?

Dependency Injection (DI) is a key feature of the Spring Framework, and Spring Boot uses it to manage object creation and relationships between objects automatically. In Spring Boot, DI is usually handled through annotations like @Autowired, @Component, and @Service.

8. How can you configure a Spring Boot application?

Spring Boot applications can be configured in multiple ways:

application.properties or application.yml files.

Using the @Configuration classes.

Via command-line arguments.

Environment variables.

9. What are profiles in Spring Boot, and how are they used?

Profiles in Spring Boot allow developers to create different configurations for different environments. For example, you can have one profile for development, one for testing, and one for production. You can specify which profile to use by setting it in the application.properties file or as a command-line argument.

10. What are the limitations of Spring Boot?

Despite its many benefits, Spring Boot has some limitations:

Lack of control over auto-configuration can sometimes lead to unexpected behaviors.

Increased memory usage due to embedded servers.

Limited flexibility in large-scale applications that require extensive custom configuration.

Addressing these limitations demonstrates that you have a well-rounded understanding of the framework and can make informed decisions about when and where to use it.

11. How does Spring Boot handle security?

Spring Boot simplifies security through Spring Security, which can be easily integrated into your application. By adding the spring-boot-starter-security dependency, you can configure authentication and authorization in a few lines of code. You can also customize login, registration, and session management features.

12. What is the role of the Spring Initializr in Spring Boot?

The Spring Initializr is an online tool used to generate Spring Boot projects. It allows developers to choose the dependencies and configuration options before downloading the skeleton code. This tool speeds up the initial setup phase, saving time and effort.

In conclusion, being well-prepared for Spring Boot interviews is crucial, especially in a competitive job market. Whether you're taking a Spring Boot course in Electronic City Bangalore or aiming for Spring Boot Certification Training, knowing these key concepts will give you the edge you need. At eMexo Technologies, you’ll receive hands-on training, not just theory, preparing you to answer interview questions and excel in your career confidently.

Join Now: https://www.emexotechnologies.com/

[freshyblog07]

Top Spring Boot Interview Questions and Answers (2025 Edition)

Spring Boot has become the standard for building production-ready Java applications with minimal configuration. If you're preparing for a backend or full-stack developer role, having a good grip on common Spring Boot interview questions is a must.

In this post, we’ll walk you through the most frequently asked Spring Boot questions to help you ace your next interview.

📘 Want a complete list with detailed answers and code examples? 👉 Read the full guide here: Spring Boot Interview Questions – Freshy Blog

🔹 What is Spring Boot?

Spring Boot is an extension of the Spring framework that simplifies the development of Java-based applications by providing auto-configuration, embedded servers, and production-ready defaults.

🔸 Common Spring Boot Interview Questions

1. What are the main features of Spring Boot?

Auto Configuration

Starter Dependencies

Spring Boot CLI

Actuator

Embedded Web Servers (Tomcat, Jetty)

2. What is the difference between Spring and Spring Boot?

Spring Boot is a rapid application development framework built on top of Spring. It eliminates boilerplate configuration and helps developers get started quickly.

🔸 Intermediate Spring Boot Questions

3. What are Starter dependencies?

Starter dependencies are a set of convenient dependency descriptors that you can include in your application. For example:

<dependency>

  <groupId>org.springframework.boot</groupId>

  <artifactId>spring-boot-starter-web</artifactId>

</dependency>

4. What is Spring Boot Actuator?

Spring Boot Actuator provides production-ready features like monitoring, metrics, and health checks of your application.

🔹 Advanced Spring Boot Questions

5. How does auto-configuration work in Spring Boot?

Spring Boot automatically configures your application based on the dependencies you have in your classpath using @EnableAutoConfiguration.

6. How can you secure a Spring Boot application?

You can use spring-boot-starter-security and configure it with annotations like @EnableWebSecurity, along with custom authentication and authorization logic.

🔍 More Questions Covered in the Full Guide:

What are Profiles in Spring Boot?

What is the role of application.properties or application.yml?

How to implement exception handling in Spring Boot?

How to integrate Spring Boot with databases like MySQL, PostgreSQL?

👉 Get full coverage with examples, tips, and best practices: 🔗 https://www.freshyblog.com/spring-boot-interview-questions/

��� Quick Tips for Spring Boot Interviews

Understand how dependency injection works

Be familiar with REST API development in Spring Boot

Practice building microservices

Explore Spring Security basics

Review annotations like @RestController, @Service, @Component, and @Repository

Final Thoughts

Mastering these Spring Boot interview questions can give you a solid edge in any technical interview. As Java continues to be a dominant backend language, Spring Boot remains a vital tool in the modern developer’s toolkit.

📘 Want to dive deeper? 👉 Visit the full interview question guide here: Spring Boot Interview Questions – Freshy Blog

[devnews]

Example of @Async in Spring Boot for Beginners

The @async annotation in Spring Boot allows you to run tasks asynchronously (in the background) without blocking the main thread. This is useful for time-consuming tasks like sending emails, processing large files, or making API calls. ✅ Step-by-Step Guide We will create a Spring Boot app where an API endpoint triggers an async task that runs in the background. 1️⃣ Add Required Dependencies In…

[learning-code-ficusoft]

How to Build REST APIs with Java and Spring Boot

How to Build REST APIs with Java and Spring Boot

Spring Boot is one of the most popular frameworks for building RESTful APIs in Java. It simplifies the development process by providing pre-configured settings, embedded servers, and minimal boilerplate code. Below is a structured guide to help you build REST APIs using Java and Spring Boot.

1. Set Up Your Spring Boot Project

You can set up a Spring Boot project using Spring Initializr:

Select Spring Boot Version (latest stable version)

Choose Project: Maven or Gradle

Select Language: Java

Add Dependencies:

Spring Web (for REST APIs)

Spring Boot DevTools (for development convenience)

Lombok (for reducing boilerplate code)

Spring Data JPA (if using a database)

H2/MySQL/PostgreSQL (database choice)

Download the project, extract it, and open it in your preferred IDE (IntelliJ IDEA, Eclipse, or VS Code).

2. Create the Main Application Class

The entry point of a Spring Boot application is the @SpringBootApplication-annotated class.javapackage com.example.restapi;import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication public class RestApiApplication { public static void main(String[] args) { SpringApplication.run(RestApiApplication.class, args); } }

3. Create a Model Class

The model represents the data structure.java package com.example.restapi.model;import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor;@Data @AllArgsConstructor @NoArgsConstructor public class Employee { private Long id; private String name; private String department; }

4. Create a REST Controller

Spring Boot uses the @RestController annotation to create API endpoints.package com.example.restapi.controller;import com.example.restapi.model.Employee; import org.springframework.web.bind.annotation.*;import java.util.ArrayList; import java.util.List;@RestController @RequestMapping("/employees") public class EmployeeController { private List<Employee> employees = new ArrayList<>(); @GetMapping public List<Employee> getAllEmployees() { return employees; } @PostMapping public Employee addEmployee(@RequestBody Employee employee) { employees.add(employee); return employee; } @GetMapping("/{id}") public Employee getEmployeeById(@PathVariable Long id) { return employees.stream() .filter(emp -> emp.getId().equals(id)) .findFirst() .orElse(null); } @DeleteMapping("/{id}") public String deleteEmployee(@PathVariable Long id) { employees.removeIf(emp -> emp.getId().equals(id)); return "Employee removed."; } }

5. Run and Test the API

Start the application by running the RestApiApplication.java class. You can test the API using Postman or cURL.

GET all employees: GET http://localhost:8080/employees

POST a new employee: POST http://localhost:8080/employees

Request Body (JSON):

json

{ "id": 1, "name": "John Doe", "department": "IT" }

GET employee by ID: GET http://localhost:8080/employees/1

DELETE an employee: DELETE http://localhost:8080/employees/1

6. Enhancements

To make the API more robust:

Use a database with JPA and Hibernate

Implement error handling using @ExceptionHandler

Add validation with @Valid

Secure the API with Spring Security and JWT

Document the API with Swagger

WEBSITE: https://www.ficusoft.in/core-java-training-in-chennai/

[jprie]

Learn Full Stack Development with Spring Boot and Angular

Full stack development is a powerful skill, enabling developers to create seamless and scalable applications by integrating front-end and back-end technologies. Combining Spring Boot for back-end development with Angular for the front-end provides a robust framework for building modern web applications. This guide will walk you through learning full stack development with these two technologies.

Why Choose Spring Boot and Angular?

Spring Boot

A Java-based framework that simplifies the creation of production-ready applications.

Provides built-in configurations to reduce boilerplate code.

Offers excellent support for REST APIs and database management.

Angular

A TypeScript-based front-end framework by Google.

Enables the development of dynamic, single-page applications (SPAs).

Offers features like two-way data binding, dependency injection, and a component-based architecture.

By integrating Spring Boot and Angular, you can create full stack applications that are efficient, scalable, and maintainable.

Prerequisites

Before diving into Spring Boot and Angular, ensure you have a basic understanding of:

Java and Object-Oriented Programming (OOP) concepts.

TypeScript and JavaScript fundamentals.

HTML, CSS, and basic front-end development.

Familiarity with RESTful APIs and database concepts.

Setting Up Your Development Environment

For Spring Boot

Install Java Development Kit (JDK).

Set up an Integrated Development Environment (IDE), such as IntelliJ IDEA or Eclipse.

Add Maven or Gradle for dependency management.

Use Spring Initializr to bootstrap your Spring Boot project.

For Angular

Install Node.js and npm (Node Package Manager).

Install the Angular CLI using the command: npm install -g @angular/cli

Set up a code editor like Visual Studio Code.

Key Concepts to Master

Back-End with Spring Boot

Creating REST APIs

Use annotations like @RestController, @RequestMapping, and @PostMapping.

Implement services and controllers to handle business logic.

Database Integration

Use Spring Data JPA with Hibernate for ORM (Object-Relational Mapping).

Work with relational databases like MySQL or PostgreSQL.

Security

Implement authentication and authorization with Spring Security.

Use JWT (JSON Web Tokens) for secure communication.

Testing

Write unit tests with JUnit and integration tests using MockMvc.

Front-End with Angular

Component-Based Architecture

Learn to create reusable components with Angular CLI.

Manage application state and communication between components.

Routing and Navigation

Use the Angular Router to create SPAs with multiple views.

HTTP Client

Communicate with back-end APIs using Angular’s HttpClientModule.

Forms and Validation

Implement reactive forms and template-driven forms.

Validate user inputs effectively.

Integrating Spring Boot and Angular

Set Up Cross-Origin Resource Sharing (CORS)

Configure Spring Boot to allow requests from the Angular front-end.

Connect Front-End and Back-End

Use Angular’s HttpClient to send requests to Spring Boot endpoints.

Serve Angular from Spring Boot

Build the Angular project and place the output in the Spring Boot static directory.

Deploy the Application

Use tools like Docker to containerize the application for deployment.

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[rockysblog24]

What are the top 10 Java SpringBoot interview questions?

Here’s a list of the Top 10 Java Spring Boot Interview Questions with detailed answers. At the end, I’ll include a promotion for Spring Online Training to help learners dive deeper into this popular framework.

1. What is Spring Boot, and how does it differ from the Spring Framework?

Answer: Spring Boot is an extension of the Spring Framework, designed to simplify the setup and development of new Spring applications by providing an opinionated approach and avoiding complex configuration. It comes with embedded servers, auto-configuration, and production-ready features, making it faster to get started with a project compared to traditional Spring Framework projects, which require more manual setup and configuration.

2. How does Spring Boot handle dependency management?

Answer: Spring Boot simplifies dependency management using Spring Boot Starters — pre-defined dependencies that bundle commonly used libraries and configurations. For instance, spring-boot-starter-web includes dependencies for building a web application, including embedded Tomcat, Spring MVC, etc. Spring Boot also supports dependency versions automatically via its parent pom.xml, ensuring compatibility.

3. What is the purpose of the @SpringBootApplication annotation?

Answer: The @SpringBootApplication annotation is a convenience annotation that combines:

@Configuration - Marks the class as a source of bean definitions.

@EnableAutoConfiguration - Enables Spring Boot’s auto-configuration feature.

@ComponentScan - Scans for components in the package.

This annotation is usually placed on the main class to bootstrap the application.

4. Explain the role of the application.properties or application.yml file in Spring Boot.

Answer: application.properties or application.yml files are used to configure the application's settings, including database configurations, server port, logging levels, and more. Spring Boot reads these files on startup, allowing developers to manage configuration without hardcoding them in code. The .yml format is more readable and hierarchical compared to .properties.

5. How does Spring Boot handle exception management?

Answer: Spring Boot provides a global exception handling mechanism via the @ControllerAdvice annotation, which allows you to define a centralized exception handler across the application. With @ExceptionHandler within a @ControllerAdvice, you can customize error responses based on the exception type.

6. What is Spring Boot Actuator, and what are its benefits?

Answer: Spring Boot Actuator provides a set of endpoints to monitor and manage a Spring Boot application, such as /health, /metrics, /info, and more. It helps with application diagnostics and monitoring, offering insights into application health, runtime metrics, environment properties, and request tracing, making it easier to monitor in production environments.

7. What is the difference between @RestController and @Controller?

Answer: @RestController is a specialized version of @Controller in Spring MVC. It is used for RESTful web services, combining @Controller and @ResponseBody annotations. This means that every method in a @RestController will return data (usually in JSON format) directly, rather than resolving to a view template. @Controller is used when views (e.g., JSP, Thymeleaf) are involved in rendering the response.

8. How does Spring Boot handle database connectivity and configuration?

Answer: Spring Boot simplifies database connectivity by providing auto-configuration for supported databases (e.g., MySQL, PostgreSQL). Using the spring.datasource.* properties in application.properties, developers can configure data source properties. For in-memory databases like H2, Spring Boot can automatically create and initialize a database using SQL scripts if placed in src/main/resources.

9. What are Profiles in Spring Boot, and how are they used?

Answer: Spring Boot Profiles allow applications to define different configurations for different environments (e.g., development, testing, production). Profiles can be set using spring.profiles.active=<profile> in application.properties or with environment-specific configuration files like application-dev.properties. Profiles enable smooth switching between configurations without changing the codebase.

10. What is the role of embedded servers in Spring Boot, and how can you configure them?

Answer: Spring Boot includes embedded servers like Tomcat, Jetty, and Undertow, enabling applications to be run independently without external deployment. This setup is useful for microservices. You can configure the embedded server (e.g., server port, SSL settings) via application.properties with properties like server.port, server.ssl.*, etc. This helps create stand-alone applications that are easy to deploy.

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For Spring Interview Question Visit :- 35 Easy Spring Framework Interview Questions and Answers

Top Spring Interview Questions and Answers (2024)

[vatt-world]

) Explain the internal working of Spring Boot. Spring Boot works by automatically setting up default configurations based on the tools our project uses. It includes built-in servers like Tomcat to run our applications. Special starter packages make it easy to connect with other technologies. We can customize settings with simple annotations and properties files. The Spring Application class starts the app, and Spring Boot Actuator offers tools for monitoring and managing it

) How does a Spring application get started? A Spring application typically starts by initializing a Spring ApplicationContext, which manages the beans and dependencies. In Spring Boot, this is often triggered by calling SpringApplication.run() in the main method, which sets up the default configuration and starts the embedded server if necessary.

What is a Spring Bean? A Spring Bean is an object managed by the Spring framework. The framework creates, configures, and connects these beans for us, making it easier to manage dependencies and the lifecycle of objects.

Spring Boot dependency management makes it easier to handle the dependencies that our project depends on. Instead of manually keeping track of them, Spring Boot helps us manage them automatically

If a starter dependency includes conflicting versions of libraries with other dependencies, Spring Boot's dependency management resolves this by using a concept called "dependency resolution." It ensures that only one version of each library is included in the final application, prioritizing the most compatible version. This helps prevent runtime errors caused by conflicting dependencies and ensures the smooth functioning of the application

How to disable a specific auto-configuration class? We can disable specific auto-configuration classes in Spring Boot by using the exclude attribute of the @EnableAutoConfiguration annotation or by setting the spring.autoconfigure.exclude property in our application.properties or application.yml file.

Describe the flow of HTTPS requests through a Spring Boot application. In a Spring Boot application, HTTPS requests first pass through the embedded server's security layer, which manages SSL/TLS encryption. Then, the requests are routed to appropriate controllers based on URL mappings.

The @SpringBootApplication annotation is a convenience annotation that combines @Configuration, @EnableAutoConfiguration, and @ComponentScan annotations. It is used to mark the main class of a Spring Boot application and trigger auto-configuration and component scanning. On the other hand, @EnableAutoConfiguration specifically enables Spring Boot's auto-configuration mechanism, which attempts to automatically configure our application based on the jar dependencies we have added.

I would:

Use dependency injection to manage dependencies.

Utilize Spring Profiles for environment-specific configurations.

Group related beans in separate configuration classes.

Use @ComponentScan to automatically discover beans.

You have a singleton bean that needs to be thread-safe. What approaches would you take to ensure its thread safety? I would:

Use synchronized methods or blocks to control access to critical sections.

Use ThreadLocal to provide thread-confined objects.

Implement stateless beans where possible to avoid share

To enable Spring Boot Actuator, we simply add the spring-boot-starter-actuator dependency to our project’s build file. O

The dev-tools dependency in Spring Boot provides features that enhance the development experience. It enables automatic restarts of our application when code changes are detected, which is faster than restarting manually.

To test a Spring Boot application, we use different tools and annotations. For testing the whole application together, we use @SpringBootTest. When we want to test just a part of our application, like the web layer, we use @WebMvcTest

How do you handle exceptions in Spring Boot applications? In Spring Boot, I handle errors by creating a special class with @ControllerAdvice or @RestControllerAdvice. This class has methods marked with @ExceptionHandler that deal with different types of errors. These methods help make sure that when something goes wrong, my application responds in a helpful way, like sending a clear error message or a specific error code.

) How can you disable specific auto-configuration classes in Spring Boot? We can disable specific auto-configuration classes in Spring Boot by using the @SpringBootApplication annotation with the exclude attribute. For example, @SpringBootApplication(exclude = {DataSourceAutoConfiguration.class}) will disable the DataSourceAutoConfiguration class.

Versioning in REST APIs helps manage changes without breaking existing clients. It allows different versions of the API to exist at the same time, making it easier for clients to upgrade gradually. We can version REST APIs in several ways: include the version number in the URL (e.g., /api/v1/resource), add a version parameter in the URL (e.g., /api/resource?version=1), use custom headers to specify the version (e.g., Accept: application/vnd.example.v1+json), or use media types for versioning (e.g., application/vnd.example.v1+json).

ResponseEntity in Spring Boot is used to customize responses. It lets us set HTTP status codes, add custom headers, and return response data as Java objects. This flexibility helps create detailed and informative responses. For example, new ResponseEntity<>("Hello, World!", HttpStatus.OK) sends back "Hello, World!" with a status code of 200 OK.

To disable the default server and enable a different one in Spring Boot, exclude the default server dependency in the pom.xml or build.gradle file and add the dependency for the desired server. For example, to switch from Tomcat to Jetty, exclude the Tomcat dependency and include the Jetty dependency in our project configuration.

@ComponentScan annotation in Spring tells the framework where to look for components, services, and configurations. It automatically discovers and registers beans in the specified packages, eliminating the need for manual bean registration and making it easier to manage and scale the application's architecture. EnableAutoConfiguration annotation in Spring Boot tells the framework to automatically configure our application based on the libraries we have included. This means Spring Boot can set up our project with the default settings that are most likely to work well for our setup.

EnableAsync annotation in Spring enables asynchronous method execution. It allows methods to run in the background on a separate thread, improving performance by freeing up the main thread for other tasks.

RestController annotation in Spring marks a class as a RESTful web service controller. It combines @Controller and @ResponseBody, meaning the methods in the class automatically return JSON or XML responses, making it easy to create REST APIs.

EnableScheduling is an annotation in Spring Framework used to enable scheduling capabilities for methods within a Spring application. It allows methods annotated with @Scheduled to be executed based on specified time intervals or cron expressions

[224vinod]

Understanding @SpringBootApplication in Spring Boot

As a senior Spring Framework developer, it’s essential to understand the power and convenience of the @SpringBootApplication annotation. This annotation is a cornerstone of Spring Boot applications, simplifying configuration and setup. Let’s explore its components and best practices for using it effectively. What is @SpringBootApplication? The @SpringBootApplication annotation is a…

[cameronmcnz]

How Spring @Component @ ComponentScan Annotations Work in Spring Boot #J...

[cloudastra1]

The @Value annotation is a powerful tool in Spring Boot for injecting configuration values into your beans. Whether you need to inject simple properties, system properties, environment variables, or more complex SpEL expressions, @Value makes it easy to externalize configuration and keep your application flexible and maintainable. The Spring Boot @Value annotation streamlines the process, ensuring that your configuration management is efficient and straightforward.

[scrumtuous]

Swagger's Java Annotations for Spring Boot to Document REST APIs with Op...