Installing gRPC Server Support Module
You need to clone the following repo on your environment: https://github.com/payara/gRPC .
Example:
git clone https://github.com/payara/gRPC
After cloning the repository you need to build and drop the JAR from the target generated files into the ${PAYARA_HOME}/glassfish/modules
directory of your Payara Server Installation.
Example:
cd grpc
mvn clean install
cd grpc-support/target
cp grpc-support-1.0.0.jar ${PAYARA_HOME}/glassfish/modules
Restart the domain and any running instances to enable the module.