dubbo 2.7.1-SNAPSHOT NoClassDefFoundError when use springboot

[GrayWind33]

• I have searched the issues of this repository and believe that this is not a duplicate.
• I have checked the FAQ of this repository and believe that this is not a duplicate.

Environment

• Dubbo version: 2.7.1-SNAPSHOT
• Operating System version: MacOS
• Java version: 1.8

Steps to reproduce this issue

1. add latest dubbo version and spring-boot-starter-dubbo
2. try to start springboot
3. java.lang.NoClassDefFoundError: org/apache/curator/retry/ExponentialBackoffRetry

Actual Result

java.lang.NoClassDefFoundError: org/apache/curator/retry/ExponentialBackoffRetry
	at org.apache.dubbo.configcenter.support.zookeeper.ZookeeperDynamicConfiguration.<init>(ZookeeperDynamicConfiguration.java:64) ~[dubbo-2.7.1-SNAPSHOT.jar:2.7.1-SNAPSHOT]
	at org.apache.dubbo.configcenter.support.zookeeper.ZookeeperDynamicConfigurationFactory.createDynamicConfiguration(ZookeeperDynamicConfigurationFactory.java:29) ~[dubbo-2.7.1-SNAPSHOT.jar:2.7.1-SNAPSHOT]
	at org.apache.dubbo.configcenter.AbstractDynamicConfigurationFactory.getDynamicConfiguration(AbstractDynamicConfigurationFactory.java:33) ~[dubbo-2.7.1-SNAPSHOT.jar:2.7.1-SNAPSHOT]...

Have to manually add curator-framework and curator-recipes and then it starts successfully. But it seems not convenient. Any problem with the pom.xml setting?
必须手动增加curator-framework和curator-recipes两个依赖，否则无法通过springboot启动，请问下是配置有问题吗
The dependency:

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
      <groupId>org.apache.dubbo</groupId>
      <artifactId>dubbo</artifactId>
      <version>2.7.1-SNAPSHOT</version>
    </dependency>

    <dependency>
      <groupId>io.dubbo.springboot</groupId>
      <artifactId>spring-boot-starter-dubbo</artifactId>
      <version>1.0.0</version>
      <exclusions>
        <exclusion>
          <groupId>com.alibaba</groupId>
          <artifactId>dubbo</artifactId>
        </exclusion>
      </exclusions>
    </dependency>

    <dependency>
      <groupId>org.apache.curator</groupId>
      <artifactId>curator-framework</artifactId>
      <version>4.0.1</version>
      <exclusions>
        <exclusion>
          <groupId>org.apache.zookeeper</groupId>
          <artifactId>zookeeper</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
    <dependency>
      <groupId>org.apache.curator</groupId>
      <artifactId>curator-recipes</artifactId>
      <version>4.0.1</version>
      <exclusions>
        <exclusion>
          <groupId>org.apache.zookeeper</groupId>
          <artifactId>zookeeper</artifactId>
        </exclusion>
      </exclusions>
    </dependency>

[LiZhenNet]

可以看一下示例：https://github.com/apache/incubator-dubbo-spring-boot-project/tree/master/dubbo-spring-boot-samples
应该仅仅添加：

  <groupId>org.apache.curator</groupId>
  <artifactId>curator-framework</artifactId>

就可以

[chickenlj]

I think it's a side effect of defaulting the Registry (only if it's zookeeper) as the Config Center.

I guess you are using zookeeper registry and zkclient, right?

[GrayWind33]

I think it's a side effect of defaulting the Registry (only if it's zookeeper) as the Config Center.

I guess you are using zookeeper registry and zkclient, right?

yes, I use zk as my registry

[zhanglypl]

用curator-client 就可以解决

[beiwei30]

we need to refresh README when we release 2.7.1