add google api to pom xml
<artifactId>grpc-stub</artifactId>
<version>${grpc.version}</version>
</dependency>
+ <dependency>
+ <groupId>com.google.api.grpc</groupId>
+ <artifactId>googleapis-common-protos</artifactId>
+ <version>0.0.3</version>
+ </dependency>
</dependencies>
</dependencyManagement>
