Consider defaultCandidate flag in case of no annotations as well

See gh-26528

Author: jhoeller

Diff for: spring-beans/src/main/java/org/springframework/beans/factory/annotation/QualifierAnnotationAutowireCandidateResolver.java

@@ -164,41 +164,40 @@ public boolean isAutowireCandidate(BeanDefinitionHolder bdHolder, DependencyDesc
 	 * Match the given qualifier annotations against the candidate bean definition.
 	 */
 	protected boolean checkQualifiers(BeanDefinitionHolder bdHolder, Annotation[] annotationsToSearch) {
-		if (ObjectUtils.isEmpty(annotationsToSearch)) {
-			return true;
-		}
 		boolean qualifierFound = false;
-		SimpleTypeConverter typeConverter = new SimpleTypeConverter();
-		for (Annotation annotation : annotationsToSearch) {
-			Class<? extends Annotation> type = annotation.annotationType();
-			boolean checkMeta = true;
-			boolean fallbackToMeta = false;
-			if (isQualifier(type)) {
-				qualifierFound = true;
-				if (!checkQualifier(bdHolder, annotation, typeConverter)) {
-					fallbackToMeta = true;
-				}
-				else {
-					checkMeta = false;
+		if (!ObjectUtils.isEmpty(annotationsToSearch)) {
+			SimpleTypeConverter typeConverter = new SimpleTypeConverter();
+			for (Annotation annotation : annotationsToSearch) {
+				Class<? extends Annotation> type = annotation.annotationType();
+				boolean checkMeta = true;
+				boolean fallbackToMeta = false;
+				if (isQualifier(type)) {
+					qualifierFound = true;
+					if (!checkQualifier(bdHolder, annotation, typeConverter)) {
+						fallbackToMeta = true;
+					}
+					else {
+						checkMeta = false;
+					}
 				}
-			}
-			if (checkMeta) {
-				boolean foundMeta = false;
-				for (Annotation metaAnn : type.getAnnotations()) {
-					Class<? extends Annotation> metaType = metaAnn.annotationType();
-					if (isQualifier(metaType)) {
-						qualifierFound = true;
-						foundMeta = true;
-						// Only accept fallback match if @Qualifier annotation has a value...
-						// Otherwise, it is just a marker for a custom qualifier annotation.
-						if ((fallbackToMeta && ObjectUtils.isEmpty(AnnotationUtils.getValue(metaAnn))) ||
-								!checkQualifier(bdHolder, metaAnn, typeConverter)) {
-							return false;
+				if (checkMeta) {
+					boolean foundMeta = false;
+					for (Annotation metaAnn : type.getAnnotations()) {
+						Class<? extends Annotation> metaType = metaAnn.annotationType();
+						if (isQualifier(metaType)) {
+							qualifierFound = true;
+							foundMeta = true;
+							// Only accept fallback match if @Qualifier annotation has a value...
+							// Otherwise, it is just a marker for a custom qualifier annotation.
+							if ((fallbackToMeta && ObjectUtils.isEmpty(AnnotationUtils.getValue(metaAnn))) ||
+									!checkQualifier(bdHolder, metaAnn, typeConverter)) {
+								return false;
+							}
 						}
 					}
-				}
-				if (fallbackToMeta && !foundMeta) {
-					return false;
+					if (fallbackToMeta && !foundMeta) {
+						return false;
+					}
 				}
 			}
 		}

Diff for: spring-context/src/test/java/org/springframework/context/annotation/configuration/BeanMethodQualificationTests.java

@@ -18,6 +18,7 @@
 
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
+import java.util.Optional;
 
 import org.junit.jupiter.api.Test;
 
@@ -85,20 +86,26 @@ void scopedProxy() {
 	@Test
 	void primary() {
 		AnnotationConfigApplicationContext ctx =
-				new AnnotationConfigApplicationContext(PrimaryConfig.class, StandardPojo.class);
+				new AnnotationConfigApplicationContext(PrimaryConfig.class, StandardPojo.class, ConstructorPojo.class);
 		StandardPojo pojo = ctx.getBean(StandardPojo.class);
 		assertThat(pojo.testBean.getName()).isEqualTo("interesting");
 		assertThat(pojo.testBean2.getName()).isEqualTo("boring");
+		ConstructorPojo pojo2 = ctx.getBean(ConstructorPojo.class);
+		assertThat(pojo2.testBean.getName()).isEqualTo("interesting");
+		assertThat(pojo2.testBean2.getName()).isEqualTo("boring");
 		ctx.close();
 	}
 
 	@Test
 	void fallback() {
 		AnnotationConfigApplicationContext ctx =
-				new AnnotationConfigApplicationContext(FallbackConfig.class, StandardPojo.class);
+				new AnnotationConfigApplicationContext(FallbackConfig.class, StandardPojo.class, ConstructorPojo.class);
 		StandardPojo pojo = ctx.getBean(StandardPojo.class);
 		assertThat(pojo.testBean.getName()).isEqualTo("interesting");
 		assertThat(pojo.testBean2.getName()).isEqualTo("boring");
+		ConstructorPojo pojo2 = ctx.getBean(ConstructorPojo.class);
+		assertThat(pojo2.testBean.getName()).isEqualTo("interesting");
+		assertThat(pojo2.testBean2.getName()).isEqualTo("boring");
 		ctx.close();
 	}
 
@@ -233,7 +240,7 @@ public static TestBean testBean1() {
 
 		@Bean @Qualifier("interesting")
 		public static TestBean testBean1x() {
-			return new TestBean("interesting");
+			return new TestBean("");
 		}
 
 		@Bean @Boring @Primary
@@ -245,7 +252,7 @@ public TestBean testBean2(TestBean testBean1) {
 
 		@Bean @Boring
 		public TestBean testBean2x() {
-			return new TestBean("boring");
+			return new TestBean("");
 		}
 	}
 
@@ -259,7 +266,7 @@ public static TestBean testBean1() {
 
 		@Bean @Qualifier("interesting") @Fallback
 		public static TestBean testBean1x() {
-			return new TestBean("interesting");
+			return new TestBean("");
 		}
 
 		@Bean @Boring
@@ -271,7 +278,7 @@ public TestBean testBean2(TestBean testBean1) {
 
 		@Bean @Boring @Fallback
 		public TestBean testBean2x() {
-			return new TestBean("boring");
+			return new TestBean("");
 		}
 	}
 
@@ -283,6 +290,19 @@ static class StandardPojo {
 		@Autowired @Boring TestBean testBean2;
 	}
 
+	@Component @Lazy
+	static class ConstructorPojo {
+
+		TestBean testBean;
+
+		TestBean testBean2;
+
+		ConstructorPojo(@Qualifier("interesting") TestBean testBean, @Boring TestBean testBean2) {
+			this.testBean = testBean;
+			this.testBean2 = testBean2;
+		}
+	}
+
 	@Qualifier
 	@Retention(RetentionPolicy.RUNTIME)
 	public @interface Boring {
@@ -323,11 +343,15 @@ public TestBean testBean2(@Lazy TestBean testBean1) {
 	@InterestingPojo
 	static class CustomPojo {
 
-		@Autowired(required=false) TestBean plainBean;
+		TestBean plainBean;
 
 		@InterestingNeed TestBean testBean;
 
 		@InterestingNeedWithRequiredOverride(required=false) NestedTestBean nestedTestBean;
+
+		public CustomPojo(Optional<TestBean> plainBean) {
+			this.plainBean = plainBean.orElse(null);
+		}
 	}
 
 	@Bean(defaultCandidate=false) @Lazy @Qualifier("interesting")