为什么我的Spring Boot@autowired MyBatis静态映射器为空？

Question

sourceMapper = null

public class Source {       
    @Autowired
    public static SourceMapper sourceMapper;   #### Why isn't this set?

    public static Source findOrCreate(String url) {
        ...
        System.out.println("sourceMapper = " + sourceMapper);
        source = sourceMapper.findByHost(host);
        ...
    }

}

package ...mapper;

@Mapper
public interface SourceMapper {
  ...

我在使用新的模型和映射器时再次遇到了这个问题。我试图理解为什么我的Spring@autowired场是空的？和代码示例，但它仍然是null！我尝试了@configurable、@service、@component。

@Configurable
public class Domain {
    @Autowired
    private static DomainMapper domainMapper;

    public static void incrementCounter(String host) {
        ...
        Domain d = getDomainMapper().find(host, thisMonth);

    public static DomainMapper getDomainMapper() {
        return domainMapper;

    public static void setDomainMapper(DomainMapper domainMapper) {
        Domain.domainMapper = domainMapper;

@Mapper
public interface DomainMapper {

MyBatis 3.4.5、MyBatis Spring 1.3.1、MyBatis Spring Boot Autoconfigure 1.3.1、MyBatis Spring Boot Starter 1.3.1

Answer 1

我用

private static DomainMapper getDomainMapper() {
    // https://stackoverflow.com/a/52997701/148844
    if (domainMapper == null)
        domainMapper = MyApplication.getApplicationContext().getBean(DomainMapper.class);
    return domainMapper;

和

@Autowired // for AWS
private static ApplicationContext context;
// I believe this only runs during an embedded Tomcat with `mvn spring-boot:run`. 
// I don't believe it runs when deploying to Tomcat on AWS.
public static void main(String[] args) {
    context = SpringApplication.run(MyApplication.class, args);

但我不喜欢！