Micrometer Tracing, Spring Boot 3.0, OTLP exporter class not found error

Question

I have Spring Boot 3.0 based project, Kotlin and Micrometer Tracing (which superseded Spring Cloud Sleuth) Trying to connect Micrometer tracing to OTLP collector, which is part of Jaeger.

The configuration class:

@Configuration
class OpenTelemetryConfiguration(
    @Value("\${otel.exporter.otlp.traces.endpoint:http://localhost:4317}")
    private val tracesEndpoint: String
) {
    @Bean
    fun spanExporter(): SpanExporter =
        OtlpGrpcSpanExporter.builder().setEndpoint(tracesEndpoint).build()

    @Bean
    fun jaegerPropagator(): TextMapPropagator =
        JaegerPropagator.getInstance()

}

Dependencies in gradle:

implementation("io.micrometer:micrometer-core:1.11.0")
implementation("io.micrometer:micrometer-tracing:1.1.1")
implementation("io.micrometer:micrometer-registry-prometheus:1.10.5")
implementation("io.micrometer:micrometer-tracing-bridge-otel:1.1.1")
implementation("io.opentelemetry:opentelemetry-sdk:1.26.0")
implementation("io.opentelemetry:opentelemetry-sdk-extension-autoconfigure-spi:1.26.0")
implementation("io.opentelemetry:opentelemetry-exporter-common:1.26.0")
implementation("io.opentelemetry:opentelemetry-exporter-otlp:1.26.0")

The error when application starts:

Failed to instantiate [io.opentelemetry.sdk.trace.export.SpanExporter]: Factory method 'spanExporter' threw exception with message: io/opentelemetry/exporter/internal/otlp/OtlpUserAgent
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:171)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653)
    ... 170 common frames omitted
Caused by: java.lang.NoClassDefFoundError: io/opentelemetry/exporter/internal/otlp/OtlpUserAgent
    at io.opentelemetry.exporter.otlp.trace.OtlpGrpcSpanExporterBuilder.<init>(OtlpGrpcSpanExporterBuilder.java:48)
    at io.opentelemetry.exporter.otlp.trace.OtlpGrpcSpanExporter.builder(OtlpGrpcSpanExporter.java:40)
    at com.logindex.geoservice.configuration.OtelConfiguration.spanExporter(OtelConfiguration.kt:19)
    ... 171 common frames omitted
Caused by: java.lang.ClassNotFoundException: io.opentelemetry.exporter.internal.otlp.OtlpUserAgent
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)

What dependency is missing there? there's no such class io.opentelemetry.exporter.internal.otlp.OtlpUserAgent in the library io.opentelemetry:opentelemetry-exporter-otlp:1.26.0

score 2 · Accepted Answer · answered Jun 02 '23 at 19:22

2

OTel is not stable yet so not every version of the OTel SDK is compatible with every version of Micrometer Tracing due to breaking changes in the OTel SDK.

You should delete all of your version definitions and let the Spring Boot BOM define versions for you, this is what you need:

implementation 'org.springframework.boot:spring-boot-starter-actuator'
implementation 'io.micrometer:micrometer-registry-prometheus'
implementation 'io.micrometer:micrometer-tracing-bridge-otel'
implementation 'io.opentelemetry:opentelemetry-exporter-otlp'

Btw Jaeger also supports Zipkin so you can use Brave too with the Zipkin exporter.

answered Jun 02 '23 at 19:22

Jonatan Ivanov

4,895
2
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30

I added opentelemetry BOM 1.26.0 and found that it refers to some other OT libraries versioned as 1.19.0. It didn't work because of mix of different versions (which were explicitly 1.26.0) . im confused why they did it like that, but it works. – Victor Mikhailov Jun 05 '23 at 13:32
@VictorMikhailov Could you please consider accepting the answer then? – Jonatan Ivanov Jun 12 '23 at 21:58

Micrometer Tracing, Spring Boot 3.0, OTLP exporter class not found error

1 Answers1