xolstice/protobuf-maven-plugin

Maven Plugin that executes the Protocol Buffers (protoc) compiler

Sergei Ivanov

@sergei-ivanov

also, go through the documentation, there are some usage examples there

fair enough

Asif Iqbal

@asif31iqbal

can i ask the other question

Sergei Ivanov

@sergei-ivanov

and gRPC people have provided some configuration examples too

sure

Asif Iqbal

@asif31iqbal

in grpc...

I have benn able to set up the server and client and pass messages betwen them

one thing I was curious though

is the maximum number of simultaneous connections the server can accept

because my server will be doing some heavily loaded multi-threaded work inside itself...so the number of simultaneous connections matters

like...

if I am running the server on a 32-thread machine

and the number of simultaneoous connections is 4

it makes sense to give each client request a thread pool of size 8 or so

Sergei Ivanov

@sergei-ivanov

I believe that gRPC runs on the back of Netty, and you should look into Netty's documentation

http://netty.io/

Asif Iqbal

@asif31iqbal

oh thanks

Sergei Ivanov

@sergei-ivanov

and don't forget that the JVM, and Netty, need to use CPU too

because Netty uses async I/O

Asif Iqbal

@asif31iqbal

hmm

Sergei Ivanov

@sergei-ivanov

but I am afraid I cannot give you a good gRPC/Netty tuning advice

Asif Iqbal

@asif31iqbal

no no

I think that was good

Sergei Ivanov

@sergei-ivanov

good luck with your project!

Asif Iqbal

@asif31iqbal

thanks

@pgeorge26

hi folks

it looks like the plugin can't find protobuf 3.1.0 executable for osx-x86_64

Error while executing process. Cannot run program "com.google.protobuf:protoc:3.1.0:exe:osx-x86_64": error=2, No such file or directory -> [Help 1]

Sergei Ivanov

@sergei-ivanov

@pradeepg26 this is strange, because I can see it in Maven Central

Sergei Ivanov

@sergei-ivanov

http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22com.google.protobuf%22%20AND%20a%3A%22protoc%22%20AND%20v%3A%223.1.0%22

can you provide a bit more context to the error?

magick93

@magick93

Hello, I am trying to generate java classes using the protobuf-maven-plugin. I can generate classes, however there is only <type>OuterClasse.java generated. No service classes are generated. Any idea why this is?

Fabien Hermenier

@fhermeni

Hello. When I use protobuf:compile it generates the code of all but my service. When I use protobuf:compile-custom, it generates only the code of my service. So a lot of code is missing

Got it, it is because the output directory where the same. Using <clearOutputDirectory>false</clearOutputDirectory>solved the problem

uruloki85

@uruloki85

Hi! I'm trying to compile 4 proto files located in 3 different projects, A.proto & B.proto in project1, C.proto in project2 and D.proto in project3. A depends on C and D.

            <plugin>
                <groupId>org.xolstice.maven.plugins</groupId>
                <artifactId>protobuf-maven-plugin</artifactId>
                <configuration>
                    <protocArtifact>com.google.protobuf:protoc:${proto.version}:exe:${os.detected.classifier}</protocArtifact>
                    <includes>
                        <include>../project2/src/main/proto/subfolder/*.proto</include>
                        <include>../project3/*.proto</include>
                        <include>src/main/proto/subfolder/*.proto</include>
                        <!-- <include>**/*.proto</include> -->
                    </includes>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>compile</goal>
                            <goal>compile-python</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

When I run maven it says "No proto files to compile.". If I uncomment <include>**/*.proto</include> then it complains about missing types (those defined in project2 and project3). I cannot find in the documentation any example or further information.

uruloki85

@uruloki85

@sergei-ivanov any help? I'd like to use relative paths to project2 and project3 (that's what I tried with ../project, going one level up and then entering in the project2 folder)

uruloki85

@uruloki85

fyi, I finally changed to a different plugin https://github.com/os72/protoc-jar-maven-plugin which very easily allowed me to do what I need

cliveseldon

@cliveseldon

Is there any example of how to find proto files in included jar dependencies of ones project?

Sergei Ivanov

@sergei-ivanov

@uruloki85 sorry, I missed your message, gitter stopped sending notifications for some reason

dependencies are handled in the standard maven way

i.e. your project compiles protos into java and then into class files, then the source protos are packaged into the resulting jar file as resources

the dependent project downloads the dependency jar with packaged protos, unpacks them and uses them as imports

include/exclude patterns are relative to the proto source directory and allow you to compile only specific proto files

Sergei Ivanov

@sergei-ivanov

so normally you should not try to reference proto files outside of your module directory (i.e. via ../project2/...)

you don't do it with java, because it goes against maven conventions, and the same principle applies to protos

the plugin handles dependencies automatically for you

@cliveseldon that probably answers your question too

if you go into the github repository for maven plugin, there are lots of examples under src/it that demonstrate dependency handling and other features

Sergei Ivanov

@sergei-ivanov

the only possible caveat is packages: protobuf compiler can be quite picky about these when importing, so please make sure that you have a directory structure under src/main/proto that reflects package declarations in your protos

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