Why spring boot does not load beans configuration in order?

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When i try to run a spring boot project, it tolde me that it can not autowire some beans whitch are instanciated in a configuration classes. I think that spring can not load those configuration classes in order.

The stack trace : no bean found the be autowired Ignite<Long,MyEntity> myEntityCache in MyDao

Here is the source :

The main class

@SpringBootApplication
// The beans in the IgniteConfig have to be loaded before dao, service, and Controller
@ComponentScan(basePackageClasses={IgniteConfig.class,AppConfig.class})
public class DemoIgnite {
   public static void main(String[] args) {
       SpringApplication.run(DemoIgnite .class, args);
   }
}

Config Class 1

@Configuration
public class IgniteConfig {
@Bean
public SpringContext springContext() {
    return new SpringContext();
}

@Bean
public Ignite igniteInstance(@Autowired SpringContext springContext) {
IgniteConfiguration cfg = new IgniteConfiguration();
cfg.setIgniteInstanceName("instance");
List<CacheConfiguration> ccDas = new ArrayList<>();
CacheConfiguration cch = new CacheConfiguration<>("myEntitycache");
cch.setCacheMode(CacheMode.REPLICATED);
cch.setIndexedTypes(Long.class, myEntity.class);
ccDas.add(cch);
cfg.setCacheConfiguration( ccDas.toArray(new CacheConfiguration[0]));
SpringCacheManager springCacheManager = new SpringCacheManager();
springCacheManager.setConfiguration(cfg);
return Ignition.start(cfg);


}

@Bean
public IgniteCache<Long, MyEntity> myEntityCache(@Autowired Ignite igniteInstance) {
 return igniteInstance.cache("myEntitycache");
}

Config class 2 

@Configuration
@ComponentScan({
"com.demo.repository",
"com.demo.service",
"com.demo.controller"
})
public class AppConfig {
}

Dao class

@Repository
public class MyDao{

@Autowired
private Ignite<Long,MyEntity> myEntityCache;
...

Service class:

@Service
public class MyService{

@Autowird
private MyDao dao;
...

Controller class:

@RestController
@RequestMapping
public class MyController{

@Autowired
private MyService service;
....
spring-boot spring
1 Answers

This means that you don't have a bean of Ignite<Long,MyEntity> type in your context. Moreover springContext bean seems redundant, it's not used by igniteInstance bean. As pointed out by moilejter it probably should be:

IgniteConfig

@Bean
public Ignite ignite() {
  ...
}

@Bean
public IgniteCache<Long, MyEntity> myEntityCache() {
  return ignite().cache("myEntitycache");
}

MyDao

@Repository
public class MyDao {

  @Autowired
  private IgniteCache<Long, MyEntity> myEntityCache;

  ...
}

In principle Spring performs the bean setup in few phases as explained in chapter 1.3.2. Instantiating Beans docs:

  1. Bean definition discovery - resources like @Configuration classes or XML files are scanned and bean signatures are collected.

  2. Eager beans instantiation e.g. singletons - from the definitions collected in point 1 while resolving dependencies between definitions. That's why there is no explicit bean instantiation order as the process is driven from dependencies.

  3. Lazy beans instantiation e.g. @Lazy annotated - when the context is already up, this beans will be constructed only when accessed from code.

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