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Fix RestClientBeanPostProcessor to avoid creating new bean when interceptor already present #15546

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Fix RestClientBeanPostProcessor to avoid creating new bean when interceptor already present #15546

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33 changes: 21 additions & 12 deletions ...tation/spring/autoconfigure/internal/instrumentation/web/RestClientBeanPostProcessor.java
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@
import io.opentelemetry.instrumentation.spring.autoconfigure.internal.properties.InstrumentationConfigUtil;
import io.opentelemetry.instrumentation.spring.web.v3_1.SpringWebTelemetry;
import io.opentelemetry.instrumentation.spring.web.v3_1.internal.WebTelemetryUtil;
import java.util.concurrent.atomic.AtomicBoolean;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.http.client.ClientHttpRequestInterceptor;
Expand Down Expand Up @@ -40,18 +41,26 @@ private static RestClient addRestClientInterceptorIfNotPresent(
RestClient restClient, OpenTelemetry openTelemetry, InstrumentationConfig config) {
ClientHttpRequestInterceptor instrumentationInterceptor = getInterceptor(openTelemetry, config);

return restClient
.mutate()
.requestInterceptors(
interceptors -> {
if (interceptors.stream()
.noneMatch(
interceptor ->
interceptor.getClass() == instrumentationInterceptor.getClass())) {
interceptors.add(0, instrumentationInterceptor);
}
})
.build();
AtomicBoolean shouldAddInterceptor = new AtomicBoolean(false);
RestClient.Builder result =
restClient
.mutate()
.requestInterceptors(
interceptors -> {
if (isInterceptorNotPresent(interceptors, instrumentationInterceptor)) {
interceptors.add(0, instrumentationInterceptor);
shouldAddInterceptor.set(true);
}
});

return shouldAddInterceptor.get() ? result.build() : restClient;
}

private static boolean isInterceptorNotPresent(
java.util.List<ClientHttpRequestInterceptor> interceptors,
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@laurit laurit Dec 10, 2025

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could you import java.util.List

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@lenin-jaganathan lenin-jaganathan Dec 10, 2025

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Yes, will also do some cleanups improvements once the approach is agreed upon. Created this for discussion, as the issue notes Webclient also suffers from same issue.

ClientHttpRequestInterceptor instrumentationInterceptor) {
return interceptors.stream()
.noneMatch(interceptor -> interceptor.getClass() == instrumentationInterceptor.getClass());
}

static ClientHttpRequestInterceptor getInterceptor(
Expand Down
44 changes: 44 additions & 0 deletions ...onfigure/internal/instrumentation/web/RestClientInstrumentationAutoConfigurationTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -87,4 +87,48 @@ void defaultConfiguration() {
"otelRestClientBeanPostProcessor", RestClientBeanPostProcessor.class))
.isNotNull());
}

@Test
void shouldNotCreateNewBeanWhenInterceptorAlreadyPresent() {
contextRunner
.withPropertyValues("otel.instrumentation.spring-web.enabled=true")
.run(
context -> {
RestClientBeanPostProcessor beanPostProcessor =
context.getBean(
"otelRestClientBeanPostProcessor", RestClientBeanPostProcessor.class);

RestClient restClientWithInterceptor =
RestClient.builder()
.requestInterceptor(
RestClientBeanPostProcessor.getInterceptor(
context.getBean(OpenTelemetry.class),
context.getBean(InstrumentationConfig.class)))
.build();

RestClient processed =
(RestClient)
beanPostProcessor.postProcessAfterInitialization(
restClientWithInterceptor, "testBean");

// Should return the same instance when interceptor is already present
assertThat(processed).isSameAs(restClientWithInterceptor);

// Verify only one interceptor exists
processed
.mutate()
.requestInterceptors(
interceptors -> {
long count =
interceptors.stream()
.filter(
rti ->
rti.getClass()
.getName()
.startsWith("io.opentelemetry.instrumentation"))
.count();
assertThat(count).isEqualTo(1);
});
});
}
}
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