Spring bean

As explained in Java Persistence with Spring Data and Hibernate epub

A Spring bean is an object instantiated, configured, and managed by the Spring application context.

A Spring bean is an object created, configured, dependency-injected, and lifecycle-managed by the Spring IoC container. Beans form the backbone of a Spring application, while the framework controls when application code is called. section 14.1

A bean participates in an application through several container responsibilities:

• Combines application classes with configuration metadata to assemble a ready-to-run application. section 14.1
• Creates objects and injects them where application components require them. section 14.1
• Allows an @Bean method to expose a constructed object for management and injection. section 16.2
• Supports startup configuration by registering an ApplicationRunner bean whose method runs before SpringApplication.run completes. section 16.2

Loading an auction as a bean

A CsvDataLoader class can define buildAuctionFromCsv() with @Bean. The method constructs an Auction, reads users from a CSV file, and returns the object. An application importing CsvDataLoader can autowire the resulting Auction and use it while an ApplicationRunner saves its users through UserRepository. section 16.2

Figure 14.2 The functionality of the Spring IoC container

Shows how the Spring IoC container combines application classes and configuration information to create a ready-to-run application. section 14.1

How Java Persistence with Spring Data and Hibernate epub covers it

How deep it goes

Explains container-managed creation and lifecycle, then demonstrates @Bean registration, injection, and startup execution without detailing bean scopes.

Examples

Demonstrates a CSV-backed Auction bean, an autowired application field, and an ApplicationRunner that persists users through UserRepository.

What it assumes

Assumes basic Java and Spring familiarity while establishing the container, inversion of control, and dependency injection roles.

What you can do after

Apply it via Spring @Bean methods, imports, autowiring, and ApplicationRunner configuration.

How it connects

Connects Spring beans to dependency injection, the IoC container, Spring Boot, ApplicationRunner, and Spring Data repositories.

liveBookmanning.com

Read Java Persistence with Spring Data and Hibernate epub on liveBook Get the book at manning.com

Also explained in

• 

  liveBookmanning.com
  Kafka Streams in Action, Second EditionA Spring bean is an object managed and configured by the Spring application container.
• 

  liveBookmanning.com
  Spring in Action, Sixth EditionAn object instantiated, configured, and managed by the Spring application context.

Compare how 3 books explain Spring bean →

Related concepts

• application contextpart of · A Spring application context is a container that creates, configures, manages, and exposes application components and their dependencies.
• Spring containerconfigured by · The Spring container is the Spring runtime component that creates, configures, wires, and manages application objects called beans.

This explainer was generated by Manning's knowledge graph from the text of Java Persistence with Spring Data and Hibernate epub. The section links point to the parts of the book it draws on.