Add a module-info.java

[sgammon]

What language does this apply to?
If it's a proto syntax change, is it for proto2 or proto3? N/A
If it's about generated code change, what programming language? Java

Describe the problem you are trying to solve.
I want to use Protobuf Java with jlink. Unfortunately, jlink rejects JARs with an Automatic-Module-Name set; it is required to define a module-info.java.

Describe the solution you'd like
I would like Protobuf Java to ship a module-info.java, in an MRJAR, to preserve existing JDK support. I am not proposing a change to the JVM bytecode minimum support level.

Describe alternatives you've considered
I have considered solutions like Moditect, but they complicate my build greatly because dependencies must be transformed before being consumed by the Java Compiler.

Additional context
Guava is considering a PR for this. Recently, Error Prone and other core libs have released new versions with a module-info.java definition. Thus, Protobuf's transitive dependencies may be ready for a fully modular Java build.

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[sgammon]

Bump!

[odinsbane]

I don't understand why this can't be done. It seems like jlink is a great way to create a stand alone app, but we cannot use protobuf with it.

[vietj]

We are willing to help on this effort, we would like very much to have JPMS support for Google Protobuf library