dubbo registry address problem use nacos （dubbo 使用nacos作为注册中心，注册地址偶发性异常）

[smallpigchina]

Issue Description

dubbo 使用nacos作为注册中心，在dubbo项目启动注册时偶然会 提示 Invalid url, password without username!，
发生这种情况多启动几次即恢复正常。
项目pom依赖如下：

org.apache.dubbo
dubbo-spring-boot-starter
2.7.7

	<!-- Dubbo Registry Nacos -->
	<dependency>
		<groupId>org.apache.dubbo</groupId>
		<artifactId>dubbo-registry-nacos</artifactId>
		<version>2.7.7</version>
		<exclusions>
			<exclusion>
				<groupId>log4j</groupId>
				<artifactId>log4j</artifactId>
			</exclusion>
			<exclusion>
				<groupId>org.apache.dubbo</groupId>
				<artifactId>dubbo-remoting-api</artifactId>
			</exclusion>
		</exclusions>
	</dependency>

application.yml:
dubbo:
consumer:
connections: 20
timeout: 4000
provider:
connections: 30
timeout: 3000
threads: 30
protocol:
name: dubbo # Dubbo Protocol
host: 192.168.10.146
port: -1 # Random port
scan:
base-packages: xxx
registry:
username: nacos
password: nacos
address: nacos://127.0.0.1:8848
file: "@dubbo.registry.file@"
timeout: 5000
parameters:
namespace: ${project_name}

Tell us your environment

jdk1.8、win10

Anything else we need to know?

[KomachiSion]

Can you provide more error stack log? I search from all the source code and could not find this error of Invalid url, password without username!

[KomachiSion]

No response more than 7 days and the information is not enough to reproduce and find problem. So close issue.