https://developers.google.com/protocol-buffers/protobuf-java/: Core Protocol Buffers library. Protocol Buffers are a way of encoding structured data in an efficient yet extensible format. 
public interface com.google.protobuf.EmptyOrBuilder extends com.google.protobuf.MessageOrBuilder
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.google.protobuf.EmptyOrBuilder
  super_class: java.lang.Object
{
}
SourceFile: "EmptyOrBuilder.java"