Wsrtjtyk

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;

....

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.