Application fails to start on GrpcChannelProperties

[kjthorpe18]

The context

Moving to version 2.15 from 2.14 to support an application on Spring Boot 3.1 with autoconfiguration. This application is a gRPC server, NOT a client.

grpc.server.port=6565

grpc.server.security.enabled=true
grpc.server.security.certificate-chain=%{GRPC_SERVER_CERT}
grpc.server.security.private-key=%{GRPC_SERVER_KEY}
grpc.server.security.trust-cert-collection=%{GRPC_CLIENT_KEY}
grpc.server.security.client-auth=REQUIRE
grpc.server.reflection-service-enabled=true

EDIT: added env vars and their use in the application properties. Environment variables set:

export GRPC_CA_CERT="file:/opt/grpc/cert/grpc_ca_cert.crt"
export GRPC_CLIENT_CERT="file:/opt/grpc/cert/grpc_client_cert.crt"
export GRPC_CLIENT_KEY="file:/opt/grpc/cert/grpc_client_key.pem"
export GRPC_SERVER_CERT="file:/opt/grpc/cert/grpc_server_cert.crt"
export GRPC_SERVER_KEY="file:/opt/grpc/cert/grpc_server_key.pem"

The bug

The application fails to start, possibly because grpc.client.* application properties are not defined, but this is not a grpc client. I do not have client properties set. Possibly this is due to the 2.15 auto configuration changes?

Stacktrace and logs

APPLICATION FAILED TO START\n***************************
Description:\n\nFailed to bind properties under 'grpc.client.cert' to net.devh.boot.grpc.client.config.GrpcChannelProperties:
Reason: org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [java.lang.String] to type [net.devh.boot.grpc.client.config.GrpcChannelProperties]
Action:
pdate your application's configuration

The application's environment

Which versions do you use?

• Spring (boot): 3.1.4
• grpc-spring-boot-starter: 2.15

[ST-DDT]

Is it possible that you have an environment variable (e.g. from kubernetes) that is GRPC_CLIENT_CERT? Also maybe you don't want to ship the client lib, if you don't plan to use it.

[kjthorpe18]

Ah I think it does have that variable. It has a shared environment variable file with other applications, and has GRPC_CLIENT_CERT, GRPC_SERVER_CERT, etc. defined with a file path like export GRPC_CLIENT_CERT="file:/opt/grpc/cert/grpc_client_cert.crt". But, still not sure why this would be picked up the way it is in the error?

And yeah, I have the client auto configs it excluded from the main application context now, but need them for integration tests, so I'm including them there.

[kjthorpe18]

I think I have two issues here:

• I have a messy configuration, and have an environment variable set to the wrong property. That env var happens to be GRPC_CLIENT_CERT, when it should be a different one for grpc.server.security.trust-cert-collection.
• But, If I even have GRPC_CLIENT_CERT set in the environment, this error is thrown. Something is picking up that environment variable and trying to use it