Reject @bean method with method-level @Autowired declaration

Closes gh-33051

Author: jhoeller

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

@@ -18,6 +18,7 @@
 
 import java.util.Map;
 
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.parsing.Problem;
 import org.springframework.beans.factory.parsing.ProblemReporter;
 import org.springframework.core.type.MethodMetadata;
@@ -45,6 +46,12 @@ final class BeanMethod extends ConfigurationMethod {
 	@Override
 	@SuppressWarnings("NullAway")
 	public void validate(ProblemReporter problemReporter) {
+		if (getMetadata().getAnnotationAttributes(Autowired.class.getName()) != null) {
+			// declared as @Autowired: semantic mismatch since @Bean method arguments are autowired
+			// in any case whereas @Autowired methods are setter-like methods on the containing class
+			problemReporter.error(new AutowiredDeclaredMethodError());
+		}
+
 		if ("void".equals(getMetadata().getReturnTypeName())) {
 			// declared as void: potential misuse of @Bean, maybe meant as init method instead?
 			problemReporter.error(new VoidDeclaredMethodError());
@@ -89,6 +96,15 @@ private static String getLocalMethodIdentifier(MethodMetadata metadata) {
 	}
 
 
+	private class AutowiredDeclaredMethodError extends Problem {
+
+		AutowiredDeclaredMethodError() {
+			super("@Bean method '%s' must not be declared as autowired; remove the method-level @Autowired annotation."
+					.formatted(getMetadata().getMethodName()), getResourceLocation());
+		}
+	}
+
+
 	private class VoidDeclaredMethodError extends Problem {
 
 		VoidDeclaredMethodError() {

spring-context/src/test/java/org/springframework/context/annotation/configuration/AutowiredConfigurationTests.java

@@ -30,6 +30,7 @@
 import org.springframework.beans.factory.ObjectFactory;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
+import org.springframework.beans.factory.parsing.BeanDefinitionParsingException;
 import org.springframework.beans.factory.support.DefaultListableBeanFactory;
 import org.springframework.beans.factory.support.RootBeanDefinition;
 import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;
@@ -47,6 +48,7 @@
 import org.springframework.util.Assert;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
 
 /**
  * System tests covering use of {@link Autowired} and {@link Value} within
@@ -187,10 +189,8 @@ void testValueInjectionWithProviderMethodArguments() {
 
 	@Test
 	void testValueInjectionWithAccidentalAutowiredAnnotations() {
-		AnnotationConfigApplicationContext context =
-				new AnnotationConfigApplicationContext(ValueConfigWithAccidentalAutowiredAnnotations.class);
-		doTestValueInjection(context);
-		context.close();
+		assertThatExceptionOfType(BeanDefinitionParsingException.class).isThrownBy(() ->
+				new AnnotationConfigApplicationContext(ValueConfigWithAccidentalAutowiredAnnotations.class));
 	}
 
 	private void doTestValueInjection(BeanFactory context) {