zentol commented on pull request #15599:
URL: https://github.com/apache/flink/pull/15599#issuecomment-1011990314


   Please try enabling dependency convergence and resolve the reported issues.
   
   ```
   <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-enforcer-plugin</artifactId>
        <executions>
                <execution>
                        <id>dependency-convergence</id>
                        <goals>
                                <goal>enforce</goal>
                        </goals>
                        <configuration>
                                <skip>false</skip>
                        </configuration>
                </execution>
        </executions>
   </plugin>
   ```
   
   From the dependency tree we can see 3 different grpc versions; 1.13.0, 
1.41.1 and 1.42.1. My theory is that Maven resolves the various grpc 
dependencies to different versions, which then causes problems with some grpc 
dependencies as they have a [very strict version range for 
grpc-core](https://mvnrepository.com/artifact/io.grpc/grpc-grpclb/1.42.0).
   I assume that if all grpc dependencies were pinned to a single version this 
issue will disappear. This can be done by adding the `grpc-bom` to the 
`dependencyManagement` section.


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