The descriptor.proto is the proto that describes proto files. This
supports that Java and C++ reflection language feature and is required
to be part of the java library.
descriptor.proto is located at protobuf-2.4.1/src/google/protobuf/
descriptor.proto (with the C++ code)
Please see the file included in the 2.4.1 distribution at
protobuf-2.4.1/java/README.txt for instructions on how to properly
build / install the java library without maven.
I've included the relevant section below:
Installation - Without Maven
============================
If you would rather not install Maven to build the library, you may
follow these instructions instead. Note that these instructions skip
running unit tests.
1) Build the C++ code, or obtain a binary distribution of protoc. If
you install a binary distribution, make sure that it is the same
version as this package. If in doubt, run:
$ protoc --version
If you built the C++ code without installing, the compiler binary
should be located in ../src.
2) Invoke protoc to build DescriptorProtos.java:
$ protoc --java_out=src/main/java -I../src \
../src/google/protobuf/descriptor.proto
3) Compile the code in src/main/java using whatever means you prefer.
4) Install the classes wherever you prefer.
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