Importing "google/protobuf/descriptor.proto" in java protocol buffers

When I have used descriptor in a .proto, I have used it like

import "google/protobuf/descriptor.proto";

message AddressBook {
  required google.protobuf.FileDescriptorSet proto_files = 1;

Then to generate the java (on windows) with addressbookSD.proto in the default directory:

protoc addressbookSD.proto --java_out=./ --proto_path=./ --proto_path=<protobuf-install-directory>\src

where <protobuf-install-directory> is the protocol buffers install directory. The key point is descriptor.proto is in

<protobuf-install-directory>\src\google\protobuf

The levels in an protobuf import stament must match directories in the File system just like they would in java.

So I use <protobuf-install-directory>\src as the import directory, The directory structure must be

<protobuf-install-directory>\src
    +-- google
         +-- protobuf
             +-- descriptor.proto

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