SpringBoot @ConditionalOnClass Anotasyonu

Giriş

Şeklen şöyle

Auto Configuration kapsamında 3 tane seçenek var

1. @ConditionalOnClass

2. @Conditional

3. @ConditionalOnProperty

4. @ConditionalOnMissingBean

Örnek

Şöyle yaparız

import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
@ConditionalOnClass(GreeterService.class)
public class GreeterServiceAutoConfiguration {
  @Bean
  @ConditionalOnMissingBean
  public GreeterService greeterService() {
    return new GreeterService("Welcome", "Mr");
  }
}

Örnek
Şöyle yaparız.

@ConditionalOnClass({DataSource.class, JpaRepository.class})