Issues with gRPC and actuator

[micheleorsi]

The context

I've tried the example and I would like to just make it working with the actuator

The bug

Application doesn't start

Stacktrace and logs

2025-02-26T15:41:16.883Z  WARN 47594 --- [demo] [           main] s.c.a.AnnotationConfigApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.boot.actuate.autoconfigure.metrics.task.TaskExecutorMetricsAutoConfiguration': Injection of autowired dependencies failed

***************************
APPLICATION FAILED TO START
***************************

Description:

An attempt was made to call a method that does not exist. The attempt was made from the following location:

    org.springframework.boot.actuate.autoconfigure.metrics.task.TaskExecutorMetricsAutoConfiguration.bindTaskExecutorsToRegistry(TaskExecutorMetricsAutoConfiguration.java:60)

The following method did not exist:

    'java.util.Map org.springframework.beans.factory.support.SimpleAutowireCandidateResolver.resolveAutowireCandidates(org.springframework.beans.factory.config.ConfigurableListableBeanFactory, java.lang.Class)'

The calling method's class, org.springframework.boot.actuate.autoconfigure.metrics.task.TaskExecutorMetricsAutoConfiguration, was loaded from the following location:

    jar:file:/Users/<user>/.gradle/caches/modules-2/files-2.1/org.springframework.boot/spring-boot-actuator-autoconfigure/3.5.0-SNAPSHOT/f51df18a3d269bceae756f193f38c3ff0e697fd6/spring-boot-actuator-autoconfigure-3.5.0-SNAPSHOT.jar!/org/springframework/boot/actuate/autoconfigure/metrics/task/TaskExecutorMetricsAutoConfiguration.class

The called method's class, org.springframework.beans.factory.support.SimpleAutowireCandidateResolver, is available from the following locations:

    jar:file:/Users/<user>/.gradle/caches/modules-2/files-2.1/org.springframework/spring-beans/6.2.1/ab57ec03ba6900075bf28e3cd70ccce173205b8d/spring-beans-6.2.1.jar!/org/springframework/beans/factory/support/SimpleAutowireCandidateResolver.class

The called method's class hierarchy was loaded from the following locations:

    org.springframework.beans.factory.support.SimpleAutowireCandidateResolver: file:/Users/<user>/.gradle/caches/modules-2/files-2.1/org.springframework/spring-beans/6.2.1/ab57ec03ba6900075bf28e3cd70ccce173205b8d/spring-beans-6.2.1.jar


Action:

Correct the classpath of your application so that it contains compatible versions of the classes org.springframework.boot.actuate.autoconfigure.metrics.task.TaskExecutorMetricsAutoConfiguration and org.springframework.beans.factory.support.SimpleAutowireCandidateResolver

Steps to Reproduce

Steps to reproduce the behavior:

./gradlew clean bootRun

The application's environment

Which versions do you use?

build.gradle.kts

import com.google.protobuf.gradle.id

plugins {
	kotlin("jvm") version "1.9.25"
	kotlin("plugin.spring") version "1.9.25"
	id("org.springframework.boot") version "3.5.0-SNAPSHOT"
	id("io.spring.dependency-management") version "1.1.7"
	id("com.google.protobuf") version "0.9.4"
}

group = "com.example"
version = "0.0.1-SNAPSHOT"

java {
	toolchain {
		languageVersion = JavaLanguageVersion.of(21)
	}
}

repositories {
	mavenCentral()
	maven { url = uri("https://repo.spring.io/milestone") }
	maven { url = uri("https://repo.spring.io/snapshot") }
}

extra["springGrpcVersion"] = "0.3.0"

dependencies {
	implementation("org.springframework.boot:spring-boot-starter-actuator")
	implementation("io.grpc:grpc-services")
	implementation("org.jetbrains.kotlin:kotlin-reflect")
	implementation("org.springframework.grpc:spring-grpc-spring-boot-starter")
	testImplementation("org.springframework.boot:spring-boot-starter-test")
	testImplementation("org.jetbrains.kotlin:kotlin-test-junit5")
	testImplementation("org.springframework.grpc:spring-grpc-test")
	testRuntimeOnly("org.junit.platform:junit-platform-launcher")
}

dependencyManagement {
	imports {
		mavenBom("org.springframework.grpc:spring-grpc-dependencies:${property("springGrpcVersion")}")
	}
}

kotlin {
	compilerOptions {
		freeCompilerArgs.addAll("-Xjsr305=strict")
	}
}

protobuf {
	protoc {
		artifact = "com.google.protobuf:protoc"
	}
	plugins {
		id("grpc") {
			artifact = "io.grpc:protoc-gen-grpc-java"
		}
	}
	generateProtoTasks {
		all().forEach {
			it.plugins {
				id("grpc") {
					option("jakarta_omit")
					option("@generated=omit")
				}
			}
		}
	}
}

tasks.withType<Test> {
	useJUnitPlatform()
}

Additional context

• Did it ever work before?

without this line it just works

implementation("org.springframework.boot:spring-boot-starter-actuator")

• Have you tried also with other versions?

yes, with the following

• 3.5.0 (SNAPSHOT)
• 3.5.0 (M2)
• 3.4.3

[micheleorsi]

posted here as well: grpc-ecosystem/grpc-spring#1170

[onobc]

Hi @micheleorsi this is probably something that has changed w/ SB 3.5.x. We currently target SB 3.4.x. It should not be too much effort to get it compatible w/ both 3.4.x and 3.5.x. We will take a look.

Thanks for the report.

posted here as well: grpc-ecosystem/grpc-spring#1170

While this project is highly based on the ecosystem, they are not the same project. This issue is something related to Spring gRPC and not the ecosystem. I would close the other issue.

[micheleorsi]

Thanks so much for the quick assesment!
Just one small thing to clarify: it doesn't work with 3.4.3 either

[onobc]

Thanks so much for the quick assesment!

You are welcome.

Just one small thing to clarify: it doesn't work with 3.4.3 either

Good to know. Thanks for that info.

[dsyer]

Can you provide a complete sample? I don't see what is different to the grpc-server sample in the project (which works).

UPDATE: one difference is the version of spring-grpc. Can you try with a snapshot (0.4.0-SNAPSHOT)?

[dsyer]

The missing method in the error message is marked as @since 6.2.3 so you just need to make sure you have the right version of Spring on the classpath. Either use an older version of Boot or a newer version of spring-grpc to make it work.

[onobc]

In its current incantation, version 0.3.0 of Spring gRPC does not work w/ actuator (regardless of Spring Boot version).

To reproduce:

Navigate to start.spring.io and select:

• Java 17
• Gradle
• Boot 3.5.0-SNAPSHOT
• Deps -> grpc + actuator

(or click this link)

Generate the project and then ./gradlew build and the test will fail w/ the reported exception.

It does work w/ 0.4.0-SNAPSHOT.

The point is that start.spring.io generates a broken app when one chooses Spring gRPC + Actuator.

[micheleorsi]

In its current incantation, version 0.3.0 of Spring gRPC does not work w/ actuator (regardless of Spring Boot version).

To reproduce:

Navigate to start.spring.io and select:

• Java 17
• Gradle
• Boot 3.5.0-SNAPSHOT
• Deps -> grpc + actuator

(or click this link)

Generate the project and then ./gradlew build and the test will fail w/ the reported exception.

It does work w/ 0.4.0-SNAPSHOT.

The point is that start.spring.io generates a broken app when one chooses Spring gRPC + Actuator.

confirmed, you can see an example here: https://github.com/micheleorsi/springboot-grpc

[micheleorsi]

confirmed also with 0.4.0-SNAPSHOT it works now!