Record a problem of springboot accessing Sentinel

Table of contents

import pom

This is the official way, springboot needs to introduce

<dependency>
    <groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
    <version>2.1.2.RELEASE</version>
</dependency>

In addition to this, it is also necessary to introduce the core package and the sentinel client-dashboard communication package. Without importing, it cannot be registered on the dashboard.

        <!--阿里的限流工具 sentinel-->
        <dependency>
            <groupId>com.alibaba.csp</groupId>
            <artifactId>sentinel-core</artifactId>
            <version>1.8.0</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba.csp</groupId>
            <artifactId>sentinel-annotation-aspectj</artifactId>
            <version>1.8.0</version>
        </dependency>
        <!-- sentinel客户端与dashboard通信依赖 -->
        <dependency>
            <groupId>com.alibaba.csp</groupId>
            <artifactId>sentinel-transport-simple-http</artifactId>
            <version>1.8.0</version>
        </dependency>

At this time, if an error is reported, it means that two classes refer to each other, causing Spring to not know which one to initialize first when initializing the bean, thus forming a circular dependency injection.

Modification method. yaml file plus

spring:
  main:
    allow-circular-references: true

Configure JVM startup parameters

The startup parameters need to be added

java -Dserver.port=8080 -Dcsp.sentinel.dashboard.server=localhost:8080 -Dproject.name=sentinel-dashboard -jar sentinel-dashboard.jar

It can also be configured in yaml, specifically Baidu

At this time, you can register successfully, see your service on the dashboard, and proceed to the next step

Error resolution

1、ClassNotFoundException com.alibaba.csp.sentinel.spi.ServiceLoaderUtil in version 1.8.1

This does not actually affect the use, because the report lacks dependencies. There are big guys on github who have already given a solution. Just replace the correct version. I use 1.8.0, and there is no problem.

ClassNotFoundException com.alibaba.csp.sentinel.spi.ServiceLoaderUtil in version 1.8.1 · Issue #2111 · alibaba/Sentinel · GitHub