Method springboot added service in the tools, the display of the blank solution

@Component // 1, the tools declared as spring assembly, this must not be forgotten

public  class TestUtils {
// 2, automatic injection
@Autowired

private ItemService itemService;

 

// 3, the beginning of the current class static

public  static TestUtils testUtils;

 

// 4, in the method annotate @PostConstruct, such a process will be performed after the container Spring Bean initialization (Note: Bean initialization includes, examples of Bean, Bean properties and assembled (dependency injection)).

@PostConstruct

public void init() {

testUtils = this;
testUtils.itemService = this.itemService;

}

 

// 5, the method used in example utils tools or service mapper interface with "testUtils.xxx. Method" on it

public static void test(Item record) {

// 6, call the service method

testUtils.itemService.insert(record);

}

}