dubbo @Reference 空指针异常

错误代码摘要

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userService': Injection of @Reference dependencies is failed; nested exception is java.lang.NullPointerException

原因

报错时我也看了很多博客但始终解决不了问题，不是网上所长出现的原因，可以检查下是否是这个原因，因为我主动注入的bean，所以spring没有处理@Reference注解，导致引用的dubbo服务为空

注入bean

	@Bean("PermissionsRealm")
	public PermissionsRealm getPermissionsRealm() {
		PermissionsRealm permissionsRealm = new PermissionsRealm();
		return permissionsRealm;
	}

PermissionsRealm中自动注入了UserService

	@Autowired
	private UserService userService;

UserService中使用了dubbo服务

	@Reference(check = false)
    GatewayService gatewayService;

处理方法

仔细检查下自己主动注入的bean是否有service中引入了dubbo服务，取消注入bean即可

	public PermissionsRealm getPermissionsRealm() {
		PermissionsRealm permissionsRealm = new PermissionsRealm();
		return permissionsRealm;
	}

修改后

2020-08-04 09:52:48 [restartedMain] INFO  org.apache.coyote.http11.Http11NioProtocol -Starting ProtocolHandler ["http-nio-80"]
2020-08-04 09:52:48 [restartedMain] INFO  org.springframework.boot.web.embedded.tomcat.TomcatWebServer -Tomcat started on port(s): 80 (http) with context path '/'
2020-08-04 09:52:48 [restartedMain] INFO  com.scsoft.SpringbootSesamApplication -Started SpringbootSesamApplication in 11.001 seconds (JVM running for 11.923)

思路就是这样，自己变通即可