@manzhizhen Pls. check the ci failure. ``` [[1;31mERROR[m] Failed to execute goal [32morg.apache.maven.plugins:maven-checkstyle-plugin:3.0.0:check[m [1m(checkstyle-validation)[m on project [36mdubbo-common[m: [1;31mFailed during checkstyle configuration[m: Exception was thrown while processing /home/travis/build/apache/incubator-dubbo/dubbo-common/src/main/java/org/apache/dubbo/common/Constants.java: TokenStreamRecognitionException occurred while parsing file /home/travis/build/apache/incubator-dubbo/dubbo-common/src/main/java/org/apache/dubbo/common/Constants.java. Unexpected character 0x60 in identifier -> [1m[Help 1][m ```
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