What is the default scope of a Spring bean?

Bean Lifecycle & Scopes

Singleton — the container creates exactly one shared instance of the bean per Spring IoC container (not per JVM), and every injection point and every getBean() call returns that same instance.

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#Scope#Singleton

What is the default scope of a Spring bean?

Spring Singleton Is Not the GoF Singleton Pattern

The classic Singleton design pattern enforces exactly-one-instance-per-JVM via a private constructor and a static getInstance() method. Spring's singleton scope is scoped to the container, not the JVM — you can have multiple ApplicationContexts in the same JVM, each with its own separate 'singleton' instance of the same class, and the class itself has a perfectly ordinary public constructor.

@Scope("singleton") (default) — one shared instance per container, reused across every injection point