Bean lifecycle callbacks

Understand the idea

PostConstruct follows construction and dependency injection. PreDestroy runs when a managed singleton is destroyed during normal context shutdown. Prototype beans receive initialization callbacks, but their destruction callbacks are not automatically invoked by Spring. Forced process termination may prevent cleanup.

A concrete example

@PostConstruct void initialize() { }
@PreDestroy void close() { }

In the application

See the independently runnable examples in Stage 23.

Calling new yourself does not invoke these callbacks automatically.

See it in a working stage

• Stage 23: observe bean initialization and shutdown

Related concepts

• Spring bean
• Dependency injection