Improve exception message to include affected configuration class

Closes gh-32998

Author: snicoll

spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClassParser.java

@@ -323,7 +323,8 @@ protected final SourceClass doProcessConfigurationClass(
 			List<Condition> registerBeanConditions = collectRegisterBeanConditions(configClass);
 			if (!registerBeanConditions.isEmpty()) {
 				throw new ApplicationContextException(
-						"Component scan could not be used with conditions in REGISTER_BEAN phase: " + registerBeanConditions);
+						"Component scan for configuration class [%s] could not be used with conditions in REGISTER_BEAN phase: %s"
+								.formatted(configClass.getMetadata().getClassName(), registerBeanConditions));
 			}
 			for (AnnotationAttributes componentScan : componentScans) {
 				// The config class is annotated with @ComponentScan -> perform the scan immediately

spring-context/src/test/java/org/springframework/context/annotation/Gh23206Tests.java

@@ -20,6 +20,7 @@
 
 import org.springframework.beans.factory.BeanDefinitionStoreException;
 import org.springframework.context.ApplicationContextException;
+import org.springframework.context.annotation.Gh23206Tests.ConditionalConfiguration.NestedConfiguration;
 import org.springframework.context.annotation.componentscan.simple.SimpleComponent;
 import org.springframework.core.type.AnnotatedTypeMetadata;
 
@@ -39,7 +40,9 @@ void componentScanShouldFailWithRegisterBeanCondition() {
 		assertThatExceptionOfType(BeanDefinitionStoreException.class).isThrownBy(context::refresh)
 				.withMessageContaining(ConditionalComponentScanConfiguration.class.getName())
 				.havingCause().isInstanceOf(ApplicationContextException.class)
-				.withMessageContaining("Component scan could not be used with conditions in REGISTER_BEAN phase");
+				.withMessageStartingWith("Component scan for configuration class [")
+				.withMessageContaining(ConditionalComponentScanConfiguration.class.getName())
+				.withMessageContaining("could not be used with conditions in REGISTER_BEAN phase");
 	}
 
 	@Test
@@ -49,7 +52,9 @@ void componentScanShouldFailWithRegisterBeanConditionOnClasThatImportedIt() {
 		assertThatExceptionOfType(BeanDefinitionStoreException.class).isThrownBy(context::refresh)
 				.withMessageContaining(ConditionalConfiguration.class.getName())
 				.havingCause().isInstanceOf(ApplicationContextException.class)
-				.withMessageContaining("Component scan could not be used with conditions in REGISTER_BEAN phase");
+				.withMessageStartingWith("Component scan for configuration class [")
+				.withMessageContaining(NestedConfiguration.class.getName())
+				.withMessageContaining("could not be used with conditions in REGISTER_BEAN phase");
 	}