CODEWITHSUNDEEP
javaspringrelease
Serhii
Serhii

Reputation: 7543

Spring core. Default @Bean destroy method

I have my own bean:

@Bean
public MyBean myBean(){...

following spring documentation to release its own resources I should specify destroyMethod. I've not found any default destroy methods called by spring in case if destroyMethod is not specified directly.

I used

@Bean(destroyMethod = "close")
public MyBean myBean(){...

but think about possibility to do not specify destroy method directly if it has value by default.

Does spring try something by default like destroy, close, release? If spring tries some methods by default to release resources - which ones?

Upvotes: 45

Views: 87787

Answers (4)

kk.
kk.

Reputation: 3945

You can implement a method which will be executed before destroying and annotate it with @PreDestroy

@PreDestroy
public void methodName() {
    //Your code..
}

Upvotes: 22

Mark Rotteveel
Mark Rotteveel

Reputation: 108938

As documented in Bean.destroyMethod:

As a convenience to the user, the container will attempt to infer a destroy method against an object returned from the @Bean method. For example, given an @Bean method returning an Apache Commons DBCP BasicDataSource, the container will notice the close() method available on that object and automatically register it as the destroyMethod. This 'destroy method inference' is currently limited to detecting only public, no-arg methods named 'close' or 'shutdown'.

In other words, if you don't specify destroyMethod, but the bean has a public close() or shutdown() method, it will be automatically used as the destroy-method.

To disable this inference, use @Bean(destroyMethod = "").

Upvotes: 83

Dmitry Senkovich
Dmitry Senkovich

Reputation: 5911

You can extend DisposableBeanAdapter class. One of the methods it provides is the destroy method being called by Spring. This way you don't have to provide any implementation while it is required when you're using DisposableBean interface.

Upvotes: 4

Ofer Skulsky
Ofer Skulsky

Reputation: 743

The org.springframework.beans.factory.DisposableBean interface specifies a single method −

void destroy() throws Exception;

Simply implement it −

public class ExampleBean implements DisposableBean {
   public void destroy() {
      // do some destruction work
   }
}

for XML-based configuration 

<bean id = "exampleBean" class = "examples.ExampleBean" destroy-method = "destroy"/>

and in the bean

public class ExampleBean {
   public void destroy() {
      // do some destruction work
   }
}

or annotate with @PreDestroy

Upvotes: 10

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