proto: duplicate proto type registered: google.protobuf.Empty

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Randall McPherson

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Mar 8, 2016, 5:39:30 PM3/8/16

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I'm seeing this error when running generated go code for grpc: proto: duplicate proto type registered: google.protobuf.Empty

It also occurs for other 'standard' types in the google.protobuf namespace.

The error log message appears to be coming from here: https://github.com/golang/protobuf/blob/d20896fc31fb0e955e57970d61eb6eea054ff048/proto/properties.go#L834

How can this be prevent this in generated code? I'm happy to provide more details about the specific code if it helps.

Feng Xiao

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Mar 11, 2016, 6:33:04 PM3/11/16

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The will happen if you run protoc twice on a proto file and include two copy of the generated file in your programs. The proto in question is included as part of protobuf library, so you don't need to run protoc on that one by yourself (otherwise you may get the error you see).

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