java.lang.ClassNotFoundException: io.grpc.services.HealthStatusManager

The context

Create a gRPC server using grpc-spring-boot-starter library.

The bug

Even when grpc.server.healthServiceEnabled=false, GrpcServerAutoConfiguration tries to create a HealthStatusManager, which fails with a ClassNotFoundException if io.grpc:grpc-services is not on the classpath. Now, if the application has indicated that it doesn’t want to enable health service, there’s no reason for it to add an unnecessary jar on the classpath that is “secretly” needed by the grpc-spring-boot-starter library.

My suggestion is to check for the presence of the class, as well as the property grpc.server.healthServiceEnabled, before creating the HealthStatusManager.

Stacktrace and logs

java.lang.IllegalStateException: Error processing condition on net.devh.boot.grpc.server.autoconfigure.GrpcServerAutoConfiguration.defaultGrpcServerProperties
	at org.springframework.boot.autoconfigure.condition.SpringBootCondition.matches(SpringBootCondition.java:60)
	at org.springframework.context.annotation.ConditionEvaluator.shouldSkip(ConditionEvaluator.java:108)
	...
Caused by: java.lang.IllegalStateException: Failed to introspect Class [net.devh.boot.grpc.server.autoconfigure.GrpcServerAutoConfiguration] from ClassLoader [jdk.internal.loader.ClassLoaders$AppClassLoader@9e89d68]
	at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:481)
	...
Caused by: java.lang.NoClassDefFoundError: io/grpc/services/HealthStatusManager
	at java.base/java.lang.Class.getDeclaredMethods0(Native Method)
	...
Caused by: java.lang.ClassNotFoundException: io.grpc.services.HealthStatusManager
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
	...

Steps to Reproduce

N/A

The application’s environment

Which versions do you use?

• Spring (boot): 2.3.1.RELEASE
• grpc-java: 1.30.2
• grpc-spring-boot-starter: 2.9.0.RELEASE

Additional context

• Did it ever work before? No
• Do you have a demo? No