Top 20 Spring Boot Features for Java Developers

Spring Boot is an important Java framework built on the Spring Framework, launched in 2003. It helps Java developers conceptualize, develop, and deploy web-based applications. The 2025 version of Spring Boot features introduces performance optimizations, enhanced observability, and native image support, significantly boosting development productivity.

Spring Boot is an intelligent ecosystem that addresses various challenges in modern software engineering. It simplifies application development by reducing manual configurations. By combining traditional development models with cloud-native architectures, Spring Boot helps Java developers build efficient and flexible software applications.

Whether you are a beginner or a professional developer, this guide will introduce you to the latest Spring Boot features designed to enhance your application's performance. We will explore its foundational, operational, security, and data management features for optimizing your development workflow.

Foundational Features for Rapid Development

Spring Boot simplifies Java application development by enabling the rapid creation of production-ready applications. It minimizes redundant or boilerplate code and simplifies application configuration, allowing developers to focus on business logic. Spring Boot manages the technical setup while providing flexibility for customization. Here are some of the foundational features of Spring Framework for rapid development:

1. Auto-Configuration

Auto-configuration is a core feature of Spring Boot that automatically configures application components based on project requirements. The system evaluates project dependencies and implements standard configurations, reducing manual setup time and configuration errors. This feature simplifies the process of configuring beans in an application by leveraging dependencies present on the classpath.

The process of Auto-configuration in Spring Boot involves the following steps:  

• After you create a Spring Boot project, you can choose dependencies for your project. Based on these dependencies, the auto-configuration feature automatically configures the beans and setup. 
• There are three important conditions for auto-configuration:
  • Conditional On Class checks if a specific class is present. If yes, the configuration is applied.
  • Conditional On Bean checks if a particular bean is defined. It further adapts itself based on that bean.
  • Conditional On Property looks for specific properties in the project, and after checking, it applies the configuration.
• After these @conditional annotations check the auto-configuration conditions, they activate the beans. They are then configured based on the class dependencies. If specific conditions are not present, a default configuration is applied.
• You can also apply @EnableAutoConfiguration or @SpringBootApplication annotations for auto-configuration in spring boot.

The important aspects of auto-configuration in spring boot are:

• Classpath Scanning: During startup, Spring Boot scans your application's classpath to identify required dependencies and applies appropriate configurations.
• Convention Over Configuration: The framework follows this approach, setting sensible defaults while allowing manual overrides when necessary.
• Error Reduction: Auto-configuration minimizes configuration errors by ensuring that compatible components work together seamlessly.
• Customization Options: Developers can exclude specific auto-configurations or override default settings through properties files.

2. Embedded Servers

Embedded servers in Spring Boot provide a self-contained environment for running web applications without requiring an external server installation. This feature packages the server within your application, streamlining deployment and reducing infrastructure requirements.

Tomcat is Spring Boot’s default embedded server. It is a lightweight container for Java web applications that handles Hypertext Transfer Protocol (HTTP) requests, manages server-side resources and executes application code. Alternatively, Jetty provides a more lightweight option with reduced resource consumption and efficient request handling. 

Both Tomcat and Jetty come with features that depend on the type of application you are building. While Tomcat works well for large applications that need stability and strong memory management, Jetty offers a faster alternative. Jetty uses less memory and processes requests quickly. It is recommended for applications that require speed over a vast list of features.

With embedded servers, Spring Boot enables zero-config deployment, allowing applications to run without manual server setup or configuration files. The embedded server starts automatically with sensible defaults and handles tasks such as:

• Managing the application lifecycle and thread pools
• Processing incoming HTTP requests and routing them to appropriate controllers
• Serving static content and managing user sessions
• Configuring security settings, including Secure Sockets Layer (SSL)/Transport Layer Security (TLS) support

3. Spring Initializr

Spring Initializr is a web-based tool that generates Spring Boot project structures with pre-configured dependencies, including those for Spring Web Services. It provides a complete project foundation, saving developers from manual setup while ensuring consistent project organization. You can create a Spring Project in the following ways by using Spring Initializr:

• Web Interface: Direct project generation via start.spring.io
• IDE Integration: Available in IntelliJ IDEA, Eclipse, and other popular IDEs
• Command-Line Interface: Enables automated project creation

Project scaffolding, a process of defining the skeleton or structure of your project, can be done through Spring Initializr. This process involves:

• Generating required directories and configuration files
• Creating pom.xml (for Maven) or build.gradle (for Gradle)
• Including selected dependencies in the build configuration
• Setting up Spring Boot starters based on project requirements
• Configuring application properties with default settings

Spring Initializr allows customization through:

• Project Metadata: Define Group ID, Artifact ID, and Version
• Build Tool Selection: Choose between Maven or Gradle
• Java Version Selection: Specify the Java version for compatibility
• Spring Boot Version Selection: Select the desired Spring Boot version
• Dependency Management: Pick from a curated list of commonly used libraries

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Spring Boot 3’s Cutting-Edge Updates

Spring Boot 3 introduces optimizations for cloud computing, enhanced security features, and improved performance metrics in Java application development. The framework now supports modern Java features and provides tools for building efficient, cloud-ready applications that align with industry requirements. Here are some of the latest Spring Boot features:

4. Java 17 Baseline

Spring Boot 3 requires Java 17 as its minimum version, marking a significant shift toward modern Java development practices. This requirement allows developers to leverage Java’s latest features while ensuring improved performance, security, and maintainability.

Java 17 support introduces several improvements that enhance Spring Boot applications by enabling cleaner code, improved efficiency, and better performance.  To understand these new advancements in the new version of Java, you can refer to our Java Tutorial. Let us discuss these improvements in detail:

• Records: Provide a concise way to create data carrier classes with minimal code. They automatically generate methods for data access, equality comparison, and string representation. Instead of writing an entire class with getters and setters, you can define a record in a single line.
• Sealed Classes: Control which other classes can inherit from them, making hierarchies more predictable and secure. When a class is marked as sealed, it explicitly defines the permitted subclasses, improving code safety and maintainability.

Performance benefits of Java 17 are:

• Memory management improvements reduce application pause times.
• Pattern matching simplifies code that checks object types.
• Text blocks allow cleaner formatting of multi-line strings.
• Enhanced pseudo-random number generators improve security.
• The Vector API enables better performance for mathematical operations.

5. GraalVM Native Image Support

Spring Boot 3 integrates with the General Recursive Applicative and Algorithmic Language Virtual Machine (GraalVM) to create native executables of Java applications. GraalVM converts Java code into standalone applications that start faster and use less memory than traditional Java applications.

Ahead-of-time (AOT) compilation converts Java bytecode into native machine code before application deployment. This process fundamentally changes how Spring Boot applications start and run in cloud environments.

Traditional Spring Boot applications use Just-in-Time (JIT) compilation, which compiles code during runtime. This creates startup delays as the application loads classes, scans components, and warms up the JIT compiler. In cloud environments, these delays impact costs and scalability.

The benefits of  GraalVM Native Support over traditional Spring Boot applications are:

• Instant startup times benefit cloud environments where quick scaling matters.
• Reduced memory usage helps control cloud infrastructure costs.
• Simplified deployment, as applications contain all required dependencies.
• Improved security through a reduced attack surface.
• Better resource utilization in containerized environments.

6. Problem Details API

The Problem Details API defines how REST APIs should structure their error responses. It creates consistent error responses that humans and machines can easily understand. The API follows internet standards to ensure compatibility across different systems. This standardization is useful in microservices architectures, where multiple services must handle errors consistently.

Spring Boot simplifies RFC 7807 implementation through its Problem Details API. RFC 7807 defines a standard format for API error responses. Spring Boot 3 features use this standard to help developers create better error messages that provide information about what went wrong and how to fix it.

The benefits of standardized error handling are:

• A consistent error format across all endpoints.
• Machine-readable responses enable automated error handling.
• Clear error messages help developers debug issues.
• Standard compliance improves API integration.
• Reduced development time through built-in error handling.

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Operational Excellence & Monitoring

Spring Boot provides tools to monitor and maintain applications in production environments. These tools help development teams track application health, performance metrics, and potential issues. The framework integrates monitoring capabilities that support both development and operations teams in maintaining reliable applications.

The Spring Boot features that offer operational excellence and monitoring are:

7. Spring Boot Actuator

Spring Boot Actuator adds monitoring and management capabilities to Spring Boot applications. It provides operational data about running applications through HTTP endpoints or Java Management Extensions (JMX). These endpoints offer information about application health, metrics, configurations, and environment properties.

The image explains the functions of the Spring Boot Actuator. Its two components, Monitor and Configuration, work in the following ways:

• Monitor refers to the various endpoints and metrics that can be used to access an application's health, performance, and memory usage.
• The configuration feature defines how the Actuator can be customized using properties files: application. properties or application.yaml. These files store information on what endpoints and metrics the actuator will collect.

Production monitoring requires visibility into application behavior. Spring Boot Actuator provides this visibility through built-in endpoints that expose operational data. The information helps teams identify and resolve issues before they impact users.

To activate the Spring Actuator feature, you must include the ‘spring-boot-starter-actuator’ dependency in your pom.xml file:

<dependency>
<groupId> org.springframework.boot</groupId>
<artifactId> spring-boot-starter-actuator </artifactId>
</dependency>

The monitoring and management features of a Spring Boot Actuator are:

• Health checks verify application status and dependency availability
• Metrics endpoints expose performance data about memory, threads, and garbage collection
• Environment endpoints show current configuration properties
• Loggers endpoint enables runtime log-level adjustments
• Secure endpoint access through Spring Security integration
• JMX support for legacy monitoring tools
• Configurable security settings for sensitive information

8. Micrometer Observability

A micrometer is a backend metrics facade or abstraction layer that provides a consistent API across various monitoring platforms. It enables Spring Boot applications to send metrics to multiple monitoring systems without code changes. Thus, it helps teams monitor system health, detect bottlenecks, and optimize performance.

Modern applications require careful monitoring across distributed systems. Micrometer Observability provides a unified monitoring and tracing framework for Java applications. It connects distributed systems by collecting performance metrics, tracking request flows, and enabling system visibility.

Micrometer connects applications to monitoring systems through a consistent API. The framework links three key components:

• Distributed Tracing: Tracks request journeys across microservices
• Metrics Export: Generates performance measurements
• Integration Platforms: Connects with monitoring solutions in Spring boot like Prometheus and Grafana for visualization

By standardizing observability across various monitoring systems, Micrometer simplifies tracking mechanisms.

The benefits of Micrometer Observability are:

• Consistent metric collection.
• Multi-platform compatibility.
• Simplified performance analysis.
• Enhanced system transparency.

9. Kubernetes Readiness Probes

Kubernetes probes determine application availability and readiness to serve traffic. The Spring Boot  Actuator provides built-in endpoints that facilitate Kubernetes integration with Spring Boot for readiness probe. These endpoints further help Kubernetes give the status of application health and monitor container deployment 

Refer to our Kubernetes guide to learn more about this open-source platform and its architecture.

The health endpoint (/actuator/health) serves as an integration point between Spring Boot applications and Kubernetes. This endpoint provides detailed health information through several check types. The health check components are:

• Liveness Probes: Verify core application operations, ensuring the system runs correctly and can recover from potential failures.
• Readiness Probes: Confirm the application's capability to process incoming requests, preventing traffic routing to unprepared instances.
• Startup Probes: Monitor the initial application launch phase, providing additional checks during initialization.

Cloud-Native & Microservices Tools

Spring Boot supports building cloud-native applications and microservices architectures. These tools help developers create scalable applications that work efficiently in cloud environments. The framework includes features for handling high-traffic loads, managing distributed systems, and monitoring application behavior across multiple services.

Let us learn about these Spring Boot features in detail:

10. Reactive Web Support (WebFlux)

Spring WebFlux is part of the Spring Boot framework, which builds reactive web applications with the Project Reactor framework. It supports reactive programming by introducing non-blocking web endpoints and using reactive types Mono and Flux to handle web requests. This model differs from the traditional Spring Web Model-View-Controller (MVC) by processing multiple requests concurrently without waiting for each to complete.

In traditional Spring MVC, each incoming request gets its own thread. When the application receives a request, it dedicates a thread to processing it from start to finish. This works well for applications with moderate traffic. However, it becomes a limitation when dealing with thousands of concurrent users or time-consuming operations like calling external services.

WebFlux improves this model by using event loops. Instead of assigning one thread per request, it uses a small number of threads to handle many requests. When a request comes in, WebFlux processes it until it needs to wait for something (like a database query). Instead of keeping the thread idle during this wait, WebFlux continues to process other requests. When the wait completes, WebFlux returns to finish processing the original request.

This approach brings significant benefits to the performance of applications, such as: 

• Applications can handle more concurrent users with fewer resources.
• Response times remain consistent even under heavy load because threads never sit idle, waiting for slow operations to complete.
• Reduced memory usage per connection.
• Lower latency for streaming operations.
• Enhanced scalability in cloud environments.

11. Spring Cloud Integration

Spring Cloud provides tools for building distributed systems. These tools help manage the complexity of running multiple services that must work together reliably. It addresses common challenges that arise when moving from monolithic to microservices architectures.

Spring Cloud Configuration Server solves complex configuration challenges by providing a central location to store all configuration data. When services start, they connect to this server to get their settings. The server can update these settings without restarting services, making it easier to manage different environments, such as development, testing, and production.

Spring Cloud simplifies service delivery and communication in distributed systems. Services must communicate, handle failures, and distribute load effectively. Spring Cloud includes several components that work together to achieve this:

• Service Discovery allows services to register themselves and find others without hardcoding addresses.
• Load Balancing distributes requests across multiple instances of the same service to improve reliability and performance.

12. Distributed Tracing

Distributed tracing provides visibility into how requests flow through a microservices system. This feature helps teams understand request paths and identify performance challenges. As systems have become more complex with many interconnected services, distributed tracing has become an essential feature of Spring Boot.

When a request enters the system, it receives a unique identifier that follows it through every service. Each service adds information about what it did, how long it took, and any errors it encountered, creating a complete picture of the request's journey through the system.

Sleuth and Zipkin help in this tracing process:

• Sleuth, a Spring Cloud component, generates trace and span IDs for each request.
• When a request moves from one service to another, Sleuth ensures the trace ID remains consistent.
• This allows teams to follow the entire request path.
• Zipkin enhances this tracking by providing a visualization platform. It collects the trace data generated by Sleuth and creates a visual representation of request flows.

This distributed tracing information helps teams understand system behavior and resolve issues. When users report problems, teams can look up the trace ID and see exactly what happened at each step. This makes it much easier to find the root cause of issues and identify performance bottlenecks.

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Security & Data Management

Spring Boot provides tools for securing applications and managing data efficiently. These features help developers protect sensitive information and interact with databases seamlessly. The framework simplifies complex security configurations and database operations, allowing teams to focus on building core application functionality.

Let us discuss the security and data management Spring Boot features in detail:

13. Simplified Spring Security

Spring Security aids in application protection with minimal configuration. It helps developers implement security measures without writing extensive boilerplate code. Hackers often seek vulnerabilities in authentication systems, session management, and data protection. Spring Security addresses these challenges through built-in mechanisms that protect applications from common threats.

Modern web applications require multiple layers of security. Three components help protect applications:

1. OAuth2 for secure authorization

The OAuth2 framework automatically configures authentication flows, token management, and user role assignments. It solves the problem of secure authorization without sharing passwords. When a user tries to access an application:

• The application redirects the user to a trusted authentication provider.
• The provider verifies the user's identity.
• The provider sends back a secure token.
• The application uses this token to grant access.

2. JWT for token-based authentication

JSON Web Token (JWT) support enables stateless authentication for microservices and web applications. JWT acts like a secure, tamper-proof ID card for users. It contains:

• User identification information
• Permissions and roles
• Expiration time
• Cryptographic signature

3. CSRF protection to prevent cross-site attacks

A Cross-Site Request Forgery (CSRF) attack occurs when an attacker tricks an authenticated user into performing unintended actions. CSRF protection prevents malicious websites from making unauthorized requests on behalf of authenticated users. It ensures that the application’s HTTP methods are read-only. Spring Boot enables CSRF protection by default.

14. Spring Data JPA Repositories

Data repositories connect applications with databases. Spring Data JPA (Java Persistence API) simplifies database interactions by automatically generating database operations. Instead of writing repetitive database queries, developers define simple interfaces that Spring automatically implements.

By extending the JpaRepository interface, developers can easily create repositories that handle basic CRUD functions without writing boilerplate code:

• Create: save() method
• Read: findById(), findAll()
• Update: save() method (same as create)
• Delete: deleteById()

Other features of Spring Data JPA Repository include:

• Custom query method creation: Spring Data JPA supports query methods that allow developers to define custom queries using method naming conventions. For example, a method named findByLastName(String lastName) automatically constructs a query to fetch records by the specified last name.
• SQL and NoSQL support: For NoSQL databases, Spring Data offers modules that implement similar CRUD operations and query abilities tailored to the specific database type (such as MongoDB or Cassandra). This flexibility makes it easier to integrate various data storage solutions into Java applications. Developers can also create SQL queries based on method names or use the @Query annotation.

15. OAuth2 Resource Server

The OAuth2 Resource Server provides secure API access management. It validates incoming requests using access tokens, ensuring only authorized users can interact with protected resources.

Spring Security 6+ implements token-based security with enhanced features. The framework validates tokens, extracts user information, and enforces access controls. Before accessing protected endpoints, each request undergoes a comprehensive verification process.

In the OAuth2 ecosystem, a token functions like a digital passport, proving a user's identity and authorized access levels. Spring Security 6+ provides the best support for implementing this security model with minimal configuration. It includes components such as:

• Token decoder: Translates and validates incoming tokens.
• Authentication converter: Extracts user details and permissions from tokens.
• Access rules: Define which endpoints require what level of authentication.

The security workflow of Spring Security 6+'s OAuth2 Resource Server is as follows:

1. A client obtains a token from an authorization server.
2. The client includes this token in API request headers.
3. The resource server validates the token's authenticity.
4. If valid, the server grants access to requested resources.
5. If invalid, the resource server rejects the request.

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Developer Productivity Boosters

Spring Boot offers powerful features that improve developer workflow. It simplifies configuration, reduces repetitive code, and provides built-in tools that enhance development processes. This allows developers to focus more on writing core business logic and less on complex setup and configuration management.

Let us discuss the Spring Boot features that increase the productivity of developers:

16. LiveReload

LiveReload is a development tool that automatically refreshes web applications when code changes occur. It eliminates the need for manual server restarts, and browser reloads during development. LiveReload monitors project files and triggers instant code/UI updates when developers make modifications.

When a change is detected, it:

• Identifies modified files
• Compiles changes
• Reloads the browser automatically
• Preserves application state

Developers can configure LiveReload through application properties, enabling or disabling the feature based on project requirements. It provides instant visual feedback, reduces development time, and makes code iteration seamless.

17. Profile-Based Configuration

Profile-based configuration is one of the best Spring Boot features. It allows developers to manage environment-specific settings efficiently. Spring Boot supports multiple configuration profiles, enabling seamless transitions between development, testing, and production environments.

Profiles help separate configurations for different environments with:

• Development Profile (application-dev.yml): Used during the development process, it provides settings and configurations that facilitate debugging and quick iteration.
• Production Profile (application-prod.yml): Used for live deployments where application stability and performance are essential. It focuses on security, performance optimizations, and reliability.
• Testing Profile (application-test.yml): This profile supports automated tests and quality assurance processes. It sets up configurations that optimize the application for testing.

Profile selection allows targeted configuration. It helps switch between different application settings for each environment without modifying the application's code. Developers can define both default and specific configurations, with profile-specific settings overriding default values when activated.

The advantages of profile-based configuration include:

• Centralized configuration management
• Environment-specific parameter control
• Hassle-free deployment process
• Enhanced security by separating sensitive configurations

18. Testing Enhancements

Spring Boot improves testing strategies by providing tools that simplify test creation and execution. The framework integrates multiple testing frameworks and utilities, reducing test complexity and development time. Developers can write comprehensive tests with minimal configuration, ensuring code quality and reliability. This approach helps teams achieve greater test coverage, catch issues early, and maintain high-quality software implementations.

Spring Boot offers powerful testing strategies and tools through the following frameworks:

1. JUnit 5

JUnit 5 is the latest version of the Java unit-testing framework. It is easy to set up and comes with the following features:

• Supports modern testing approaches
• Provides advanced annotation-based testing
• Enables nested and parameterized tests
• Integrates seamlessly with Spring Boot

2. Testcontainers

Testcontainers is an open-source library that uses a Docker container environment to test Spring Boot applications. It integrates with JUnit 5 to write test classes that communicate with backend services such as MySQL and MongoDB.

The features of the Testcontainers library include:

• Managing lightweight, disposable database instances
• Supporting integration testing with real database environments
• Eliminating manual database setup
• Ensuring consistent testing scenarios

3. @SpringBootTest Annotation

The @SpringBootTest annotation in Spring Boot allows developers to test the full integration of components. It makes it easier to verify how different parts of the application work together in real-world scenarios.

Sample Code Snippet:

@SpringBootTest  
class UserServiceTest {  
    @Test  
    void testUserCreation()
} 

Features of the @SpringBootTest annotation in Spring Boot:

• Loads the complete application context
• Supports integration testing
• Reduces boilerplate configuration code
• Enables dependency injection during tests

19. Observability Enhancements

The advanced observability features of Spring Framework help developers monitor and understand system behavior. The framework provides tools for tracking application performance, detecting issues, and generating meaningful insights. By integrating metrics, logs, and tracing mechanisms, developers gain in-depth visibility into application internals and runtime characteristics.

Spring Boot implements observability through the Micrometer Observation API, a library that provides a consistent way to collect, manage, and analyze performance data across different monitoring systems.

Its key features include:

• Unifying metrics and tracing collection in applications
• Providing standardized monitoring interfaces
• Supporting multiple monitoring systems
• Enabling distributed tracing capabilities

The Micrometer Observation API allows automatic context propagation for tracking requests across different system components. It supports multiple monitoring backends, enabling seamless integration with tools like Prometheus, Zipkin, and OpenTelemetry.

Developers can configure detailed observability settings through application properties, tailoring monitoring to specific project requirements. This helps teams understand and optimize application behavior, making system monitoring more accessible and actionable.

20. Native Image Support

Native image support is crucial to Spring Boot’s overall performance optimization strategy. This technology converts Java applications into standalone executables that run directly on machine hardware. Traditional Java applications depend on the Java Virtual Machine (JVM), which introduces startup overhead and consumes significant memory resources.

GraalVM native image compilation addresses these challenges by precompiling application code into machine-specific binary executables during build time. This process eliminates runtime interpretation and compilation, allowing developers to benefit from faster startup times, reduced memory consumption, and improved overall application efficiency.

Native image compilation enhances performance by:

• Creating compact, optimized executables for specific hardware environments
• Performing comprehensive static analysis to remove unused code
• Generating highly efficient machine instructions

Applications compiled as native images start almost instantaneously, within milliseconds, compared to traditional JVM applications, which may take seconds. The compiled executable contains only necessary runtime components, eliminating the overhead of loading complete JVM infrastructure. This approach is useful for microservices, serverless functions, and cloud-native applications, where scaling and resource efficiency are very important.

How Can upGrad Help You Master Spring Boot?

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Wrapping Up!

Java development continues to evolve with frameworks that anticipate and address technological challenges. The Spring Boot features in 2025 cater to Java developers' changing needs. Tools like LiveReload provide quicker feedback during coding, while profile-based configuration streamlines environment management. Testing enhancements improve code reliability, and observability features offer valuable insights into application performance.

Adopting these features of the Spring framework leads to better collaboration, faster deployments, and lower operational costs. These capabilities help Java developers stand out in the job market by enabling them to build high-performance, scalable applications.

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