Spring 按类排序对 bean 进行排序

Question

I have two classes and one of the classes should execute first at run-time among-st the two but it's happening the other way around.

First Class:

@Configuration
public class A(){
@Bean
public void methodA(){}

@Bean
public void methodB(){
        for(i=0;i<9;i++){
            B b = new B();
            b.setJdbcUrl();
            b.setUsername();
            b.setPassword();
        }
    }
}

Second Class:

@Configuration
public class B() extends HikariConfig {
@Bean
public HikariDataSource mysqlDataSource(){}

@Bean(name = "someEntityManager")
public LocalContainerEntityManagerFactoryBean mysqlEntityManagerFactory(EntityManagerFactoryBuilder builder) {}

@Bean(name = "someTransactionManager")
public PlatformTransactionManager mysqlTransactionManager(@Qualifier("someEntityManager") EntityManagerFactory entityManagerFactory) {}

Currently the order followed by the Spring is :
1) b.mysqlDataSource()
2) b.LocalContainerEntityManagerFactoryBean mysqlEntityManagerFactory(EntityManagerFactoryBuilder builder)
3) b.PlatformTransactionManager mysqlTransactionManager(@Qualifier("someEntityManager") EntityManagerFactory entityManagerFactory)
4) a.methodA()
5) a.methodB()

My order should be followed by the Spring as:
1) a.methodA()
2) a.methodB()
3) b.mysqlDataSource()
4) b.LocalContainerEntityManagerFactoryBean mysqlEntityManagerFactory(EntityManagerFactoryBuilder builder)
5) b.PlatformTransactionManager mysqlTransactionManager(@Qualifier("someEntityManager") EntityManagerFactory entityManagerFactory)

And it must also go through the code where class B is the only one which depends all the url,username and password settings class A, so A must be initiated first.

Answer 1

You can use @DependsOn:

@Configuration
public class A {

    @Bean
    public void methodA() {
    }

    @DependsOn("methodA")    
    @Bean
    public void methodB() {
        for (i = 0; i < 9; i++) {
            B b = new B();
            b.setJdbcUrl();
            b.setUsername();
            b.setPassword();
        }
    }
}

@Configuration
@DependsOn({"methodA", "methodB"})
public class B extends HikariConfig {

    @DependsOn("mysqlEntityManagerFactory")
    @Bean
    public HikariDataSource mysqlDataSource() {
    }

    @DependsOn("mysqlTransactionManager")
    @Bean(name = "someEntityManager")
    public LocalContainerEntityManagerFactoryBean mysqlEntityManagerFactory(EntityManagerFactoryBuilder builder) {
    }

    @Bean(name = "someTransactionManager")
    public PlatformTransactionManager mysqlTransactionManager(@Qualifier("someEntityManager") EntityManagerFactory entityManagerFactory) {
    }

}