Spring boot web-将bean自动转换为XML定义的bean为空

Question

我正在将现有的基于Spring3.1的web应用程序转换为SpringBoot1.2.5。我最初将旧应用程序升级到Spring4.1.7。

<context:annotation-config/>
<context:component-scan base-package="x.y.z"/>
<bean id="discoveredResourceClasses" factory-bean="resourceManager" factory-method="getResourceClasses">
    <constructor-arg>
        <list>
            <value>x.y.z.resources</value>
        </list>
    </constructor-arg>
</bean>

@Service
public class ResourceManager implements Serializable{
    @Autowired
    protected IExtensionManager extensionManager;

    public List<Class<? extends Resource>> getResourceClasses(String ... packageNames)
    {
        return extensionManager.getExtensions(packageName, includeEverything, Resource.class);
    }
}

@Service
public class ExtensionManager implements IExtensionManager {

    public <T> List<T> getExtensions(String packageName, Map<String, String> filter, Class<T> clazz) {
        //busoinesslogic .
    }

}

@ImportResource("classpath*:xad-config-all.xml")
@SpringBootApplication
public class Application extends SpringBootServletInitializer {

   @Override
   protected SpringApplicationBuilder configure(SpringApplicationBuilder              application) {
    return application.sources(Application.class);
   }

   public static void main(String[] args) {
      SpringApplication.run(Application.class, args);
   }

在创建ResourceManagerbean时，ExtensionManager字段将以NULL的形式出现。因此工厂方法（getResourceClasses）抛出NullPointerException。

Answer 1

您需要在beggining时提供xml配置文件的路径，当时Spring还没有开始构建应用程序上下文。@ImportResource注释是在注册了许多后处理器之后，在此过程中处理的。

您需要使用SpringApplicationBuilder.Sources方法提供xml配置的路径。

@SpringBootApplication
public class Application extends SpringBootServletInitializer {

@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
    return builder.sources("classpath:/WEB-INF/context/payables-profile.xml", Application.class);
}