Improve SpanFactory autoconfiguration mechanism.

spring-boot-autoconfigure/src/main/java/org/axonframework/springboot/autoconfig/AxonTracingAutoConfiguration.java

@@ -60,7 +60,8 @@ public SpanFactory spanFactory() {
     @Bean
     public HandlerEnhancerDefinition tracingHandlerEnhancerDefinition(SpanFactory spanFactory,
                                                                       TracingProperties properties) {
-        return TracingHandlerEnhancerDefinition.builder().spanFactory(spanFactory)
+        return TracingHandlerEnhancerDefinition.builder()
+                                               .spanFactory(spanFactory)
                                                .showEventSourcingHandlers(properties.isShowEventSourcingHandlers())
                                                .build();
     }

spring-boot-autoconfigure/src/main/java/org/axonframework/springboot/autoconfig/AxonTracingSpanAttributeProviderAutoConfiguration.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2010-2022. Axon Framework
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.axonframework.springboot.autoconfig;
+
+import org.axonframework.springboot.TracingProperties;
+import org.axonframework.tracing.SpanAttributesProvider;
+import org.axonframework.tracing.SpanFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.AutoConfigureAfter;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.Configuration;
+
+import java.util.List;
+
+/**
+ * Responsible for configuring all registed {@link SpanAttributesProvider} beans to the active {@link SpanFactory}
+ * implementation. This allows the easier to more easily configure any {@code SpanFactories}.
+ *
+ * @author Mitchell Herrijgers
+ * @see AxonTracingAutoConfiguration
+ * @since 4.6.0
+ */
+@Configuration
+@AutoConfigureAfter({AxonTracingAutoConfiguration.class})
+@EnableConfigurationProperties(TracingProperties.class)
+public class AxonTracingSpanAttributeProviderAutoConfiguration {
+
+    @Autowired
+    public void configureSpanAttributeProviders(SpanFactory spanFactory,
+                                                List<SpanAttributesProvider> spanAttributesProviders) {
+        spanAttributesProviders.forEach(spanFactory::registerSpanAttributeProvider);
+    }
+}

spring-boot-autoconfigure/src/main/java/org/axonframework/springboot/autoconfig/OpenTelemetryAutoConfiguration.java

@@ -16,7 +16,6 @@
 
 package org.axonframework.springboot.autoconfig;
 
-import org.axonframework.tracing.SpanAttributesProvider;
 import org.axonframework.tracing.SpanFactory;
 import org.axonframework.tracing.opentelemetry.OpenTelemetrySpanFactory;
 import org.springframework.boot.autoconfigure.AutoConfigureBefore;
@@ -25,8 +24,6 @@
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
-import java.util.List;
-
 /**
  * Automatically configured the {@link OpenTelemetrySpanFactory} as the method of providing tracing in Axon Framework.
  * For this to take effect, the {@code axon-tracing-opentelemetry} dependency must be on the classpath.
@@ -41,9 +38,8 @@ public class OpenTelemetryAutoConfiguration {
 
     @Bean
     @ConditionalOnMissingBean(SpanFactory.class)
-    public SpanFactory spanFactory(List<SpanAttributesProvider> attributesProviders) {
+    public SpanFactory spanFactory() {
         return OpenTelemetrySpanFactory.builder()
-                                       .addSpanAttributeProviders(attributesProviders)
                                        .build();
     }
 }