*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
JsonFormat.parser()either.
Is there a way to make this *Protobuf → JSON → Protobuf*
serialization/deserialization
chain work?
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