JsonFormat doesn't support extensions. You can replace extensions with google.protobuf.Any if you want to use the proto with JsonFormat.
On Wed, Dec 20, 2017 at 3:39 PM, Behrang Saeedzadeh <behran...@gmail.com> wrote: > > > *down vote**favorite* > <https://stackoverflow.com/questions/47903567/how-to-fix-com-google-protobuf-invalidprotocolbufferexception-cannot-find-fiel#> > > *Cross-post from > StackOverflow: > https://stackoverflow.com/questions/47903567/how-to-fix-com-google-protobuf-invalidprotocolbufferexception-cannot-find-fiel > <https://stackoverflow.com/questions/47903567/how-to-fix-com-google-protobuf-invalidprotocolbufferexception-cannot-find-fiel>* > > I have 2 Protobuf models: > User: > > package demo; > > option java_package = "com.stackoverflow.question"; > option java_outer_classname = "UserModel"; > > message User { > > message UserHeader { > required int64 userId = 1; > } > > required UserHeader header = 1; > > extensions 100 to 200;} > > Employee: > > import "person.proto"; > package demo; > > option java_package = "com.stackoverflow.question"; > option java_outer_classname = "EmployeeModel"; > > extend demo.User { > optional EmployeeDetails details = 101;} > > message EmployeeDetails { > required string department = 1; > repeated Skill skills = 2;} > > message Skill { > required int64 id = 1; > required string name = 2;} > > I can create a model and serialize it to JSON using JsonFormat.printer(). > print(...): > > ExtensionRegistry registry = > ExtensionRegistry.newInstance();EmployeeModel.registerAllExtensions(registry); > UserModel.User.Builder userBuilder = UserModel.User.newBuilder(); > userBuilder.setHeader(UserModel.User.UserHeader.newBuilder().setUserId(1000)); > EmployeeModel.EmployeeDetails.Builder employeeBuilder = > EmployeeModel.EmployeeDetails.newBuilder(); > employeeBuilder.setDepartment("Department 1") > .addSkills(EmployeeModel.Skill.newBuilder() > .setId(10_000) > .setName("Skill 10_0000") > .build()) > .addSkills(EmployeeModel.Skill.newBuilder() > .setId(11_000) > .setName("Skill 11_0000") > .build()); > > userBuilder.setExtension(EmployeeModel.details, employeeBuilder.build()); > final String json = JsonFormat.printer().print(userBuilder.build()); > > However deserializing the generated JSON back to Java objects fails with > com.google.protobuf.InvalidProtocolBufferException: Cannot find field: > details in message demo.User: > > UserModel.User.Builder userBuilder2 = UserModel.User.newBuilder(); > JsonFormat.parser().merge(json, userBuilder2); > > And there doesn't seem to be a way to pass an ExtensionRegistry to JsonFo > rmat.parser()either. > > Is there a way to make this *Protobuf → JSON → Protobuf* > serialization/deserialization > chain work? > > -- > You received this message because you are subscribed to the Google Groups > "Protocol Buffers" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to protobuf+unsubscr...@googlegroups.com. > To post to this group, send email to protobuf@googlegroups.com. > Visit this group at https://groups.google.com/group/protobuf. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Protocol Buffers" group. To unsubscribe from this group and stop receiving emails from it, send an email to protobuf+unsubscr...@googlegroups.com. To post to this group, send email to protobuf@googlegroups.com. Visit this group at https://groups.google.com/group/protobuf. For more options, visit https://groups.google.com/d/optout.
