Difficulty: Easy
Correct Answer: Objects that are created, configured, and managed by the Spring inversion of control container
Explanation:
Introduction / Context:
The Spring Framework uses an inversion of control container to manage the lifecycle and dependencies of application objects. These managed objects are called Spring beans. Understanding what a bean is and how the container deals with beans is essential for building applications with Spring, because most configuration and wiring revolves around defining and using beans correctly.
Given Data / Assumptions:
Concept / Approach:
A Spring bean is any object that is instantiated, configured, and managed by the Spring container. Beans are typically defined through annotations, XML, or Java configuration classes. The inversion of control container is responsible for creating bean instances, injecting dependencies, managing scopes such as singleton or prototype, and calling lifecycle callbacks. Beans represent the core building blocks of a Spring application.
Step-by-Step Solution:
Step 1: Recall that Spring uses an application context to hold bean definitions.
Step 2: Understand that bean definitions describe how objects should be created, including constructor arguments and property values.
Step 3: Remember that the inversion of control container takes over the responsibility of constructing these objects and wiring them together.
Step 4: Look at the options and find the one that states that beans are objects created, configured, and managed by the Spring inversion of control container.
Step 5: Discard options that talk about Java keywords, static methods, or database tables because those are not correct descriptions of beans.
Verification / Alternative check:
In a typical Spring project, you annotate a class with Component, Service, Repository, or use Bean methods inside a configuration class. At runtime, the container scans these definitions and creates bean instances. The fact that you generally do not call new on these classes in your own code, but instead inject them, confirms that they are managed by the container as beans.
Why Other Options Are Wrong:
Option B: Describes reserved keywords, which are part of the Java language syntax and unrelated to Spring beans.
Option C: Talks about static methods compiled into the virtual machine, but beans are ordinary objects, not static methods.
Option D: Refers to database tables that might be generated by Spring Data, which again are not the same as beans.
Common Pitfalls:
A common pitfall is to confuse plain Java objects that you create yourself with beans that are managed by Spring. Another mistake is to perform manual object creation instead of relying on dependency injection, which undermines the benefits of inversion of control. Recognising that beans are managed objects inside the application context helps enforce proper architectural patterns.
Final Answer:
In the Spring Framework, Spring beans are Objects that are created, configured, and managed by the Spring inversion of control container.
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