{"record":{"id":"254d68d5d13bb36d","repo":"go-kratos/kratos","slug":"failed-to-marshal-message-is-t-want-proto-messa-254d68","errorCode":null,"errorMessage":"failed to marshal, message is %T, want proto.Message","messagePattern":"failed to marshal, message is %T, want proto\\.Message","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"transport/grpc/codec.go","lineNumber":25,"sourceCode":"\t\"google.golang.org/protobuf/proto\"\n\n\tenc \"github.com/go-kratos/kratos/v3/encoding\"\n\t\"github.com/go-kratos/kratos/v3/encoding/protojson\"\n)\n\nconst jsonName = \"json\"\n\nfunc init() {\n\tencoding.RegisterCodec(codec{})\n}\n\n// codec is a Codec implementation with protobuf. It is the default codec for gRPC.\ntype codec struct{}\n\nfunc (codec) Marshal(v any) ([]byte, error) {\n\tvv, ok := v.(proto.Message)\n\tif !ok {\n\t\treturn nil, fmt.Errorf(\"failed to marshal, message is %T, want proto.Message\", v)\n\t}\n\treturn enc.GetCodec(protojson.Name).Marshal(vv)\n}\n\nfunc (codec) Unmarshal(data []byte, v any) error {\n\tvv, ok := v.(proto.Message)\n\tif !ok {\n\t\treturn fmt.Errorf(\"failed to unmarshal, message is %T, want proto.Message\", v)\n\t}\n\treturn enc.GetCodec(protojson.Name).Unmarshal(data, vv)\n}\n\nfunc (codec) Name() string {\n\treturn jsonName\n}\n","sourceCodeStart":7,"sourceCodeEnd":41,"githubUrl":"https://github.com/go-kratos/kratos/blob/668db92c2c001e9552594ba5a8aede8456af6d7e/transport/grpc/codec.go#L7-L41","documentation":"Error \"failed to marshal, message is %T, want proto.Message\" thrown in go-kratos/kratos.","triggerScenarios":"Thrown at transport/grpc/codec.go:25 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"668db92c2c001e9552594ba5a8aede8456af6d7e","analyzedAt":"2026-08-16T02:07:20.704Z","schemaVersion":2},"datasetVersion":"2026-08-16T03:17:38.424Z"}