protoc 生成的 java  类提示 
Cannot resolve method 'isStringEmpty' in 'GeneratedMessageV3'

com.google.protobuf.GeneratedMessageV3.isStringEmpty
 
protoc --version 
libprotoc 3.19.4

protobuf-java 
protobuf-java-3.12.0.jar


protobuf-java  和 protoc 版本不一致

使用 protoc-3.14.0 版本 
https://github.com/protocolbuffers/protobuf/releases/download/v3.14.0/protoc-3.14.0-osx-x86_64.zip

/Users/dugang/soft/protoc-3.14.0-osx-x86_64/bin/protoc --java_out=/Users/dugang/tmp  *.proto 



 protobuf 简介 及 java实例