- [x] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate. - [x] I have checked the [FAQ](https://github.com/apache/dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate.
### Environment * Dubbo version: 2.7.4-SNAPSHOT * Operating System version: "mac os x", version: "10.12.6", arch: "x86_64", family: "mac" * Java version: 1.8.0_131 ### Steps to reproduce this issue 1. just run UT `EtcdMetadataReportTest.testStoreConsumer` in IDEA or `mvn clean install -DskipTests=false` from cmd. ### Expected Result UT succeeds ### Actual Result Ex: #### IDEA ``` java.lang.NoClassDefFoundError: com/google/common/base/Preconditions at io.etcd.jetcd.ClientBuilder.endpoints(ClientBuilder.java:82) at org.apache.dubbo.metadata.store.etcd.EtcdMetadataReportTest.setUp(EtcdMetadataReportTest.java:64 ``` #### mvn build with clean install ``` [ERROR] Tests run: 2, Failures: 0, Errors: 1, Skipped: 1, Time elapsed: 4.798 s <<< FAILURE! - in org.apache.dubbo.metadata.store.etcd.EtcdMetadataReportTest [ERROR] testStoreConsumer Time elapsed: 2.127 s <<< ERROR! java.lang.NoClassDefFoundError: com/google/common/base/Preconditions at org.apache.dubbo.metadata.store.etcd.EtcdMetadataReportTest.setUp(EtcdMetadataReportTest.java:64) Caused by: java.lang.ClassNotFoundException: com.google.common.base.Preconditions at org.apache.dubbo.metadata.store.etcd.EtcdMetadataReportTest.setUp(EtcdMetadataReportTest.java:64) [ Full content available at: https://github.com/apache/dubbo/issues/5080 ] This message was relayed via gitbox.apache.org for notifications@dubbo.apache.org
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