gRPC Proof-of-Concept

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🚧 JPMS disabled: Because of grpc/grpc-java#3522 JPMS had to be disabled by renaming module-info.java to module-info.java.disabled.

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This is a proof-of-concept for using gRPC. In addition to that, the project is based on Java 11 and uses its module system.

IDE Support

For IntelliJ Idea it is recommended to install:

• Protobuf Support

in order to get support editing .proto files.

Notes

• Field Names: Snake-case field names will be transformed to camel-case.

• JavaDoc: Any comments will be added as is (escaped) into a <pre> block. To change this is marked as TODO:

  https://github.com/grpc/grpc-java/blob/71d067e8f5ccecedd17a38f5b01a77e56841836a/compiler/src/java_plugin/cpp/java_generator.cpp#L291

Troubleshooting

javax.annotation does not exist

Caused by grpc/grpc-java#3633, the annotation to mark generated classes javax.annotation.Generated is not available. Some projects mentioned a similar problem — the overall problem is to support Java 8- and Java 9+ in parallel.

While you would use javax.annotation.processing.Generated in Java 9+ projects, it is javax.annotation.Generated for Java 8-. Current workaround for Java 11 is to add the following dependency (for example as provided scope):

<dependency>
  <groupId>javax.annotation</groupId>
  <artifactId>javax.annotation-api</artifactId>
  <version>1.3.1</version>
</dependency>

See Also

• grpc.io
• grpc@GitHub
• Introduction to gRPC | Baeldung
• Language Guide (proto3) | Protocol Buffers | Google Developers
• Maven Protocol Buffers Plugin – Introduction
• Protobuf Support - Plugins | JetBrains
• Protocol Buffers | Google Developers