Support injecting a list of Spring beans

This is now possible due to the existence of
Arc's `@All`

Fixes: quarkusio#5668

extensions/spring-di/deployment/pom.xml

@@ -28,6 +28,11 @@
             <artifactId>quarkus-junit5-internal</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>

extensions/spring-di/deployment/src/main/java/io/quarkus/spring/di/deployment/SpringDIProcessor.java

@@ -76,6 +76,7 @@ public class SpringDIProcessor {
     private static final DotName CDI_NAMED_ANNOTATION = DotNames.NAMED;
     private static final DotName CDI_INJECT_ANNOTATION = DotNames.INJECT;
     private static final DotName CDI_PRODUCES_ANNOTATION = DotNames.PRODUCES;
+    private static final DotName QUARKUS_ALL_ANNOTATION = DotNames.ALL;
     private static final DotName MP_CONFIG_PROPERTY_ANNOTATION = DotName.createSimple(ConfigProperty.class.getName());
 
     @BuildStep
@@ -384,6 +385,14 @@ Set<AnnotationInstance> getAnnotationsToAdd(
                                 Collections.singletonList((AnnotationValue.createStringValue("value", value)))));
                     }
                 }
+
+                // in Spring List<SomeBean> means that all instances of SomeBean should be injected
+                if (fieldInfo.type().name().equals(DotNames.LIST)) {
+                    annotationsToAdd.add(create(
+                            QUARKUS_ALL_ANNOTATION,
+                            target,
+                            Collections.emptyList()));
+                }
             } else if (fieldInfo.hasAnnotation(SPRING_VALUE_ANNOTATION)) {
                 final AnnotationInstance annotation = fieldInfo.annotation(SPRING_VALUE_ANNOTATION);
                 addSpringValueAnnotations(target, annotation, true, annotationsToAdd);
@@ -418,6 +427,13 @@ Set<AnnotationInstance> getAnnotationsToAdd(
                         CDI_INJECT_ANNOTATION,
                         target,
                         Collections.emptyList()));
+                // in Spring List<SomeBean> means that all instances of SomeBean should be injected
+                if (methodInfo.returnType().name().equals(DotNames.LIST)) {
+                    annotationsToAdd.add(create(
+                            QUARKUS_ALL_ANNOTATION,
+                            target,
+                            Collections.emptyList()));
+                }
             }
 
             // add method parameter conversion annotations

extensions/spring-di/deployment/src/test/java/io/quarkus/spring/di/deployment/ListOfBeansTest.java

@@ -0,0 +1,94 @@
+package io.quarkus.spring.di.deployment;
+
+import static org.assertj.core.api.AssertionsForInterfaceTypes.assertThat;
+
+import java.util.List;
+
+import javax.inject.Inject;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+import org.springframework.stereotype.Repository;
+
+import io.quarkus.arc.All;
+import io.quarkus.test.QuarkusUnitTest;
+
+public class ListOfBeansTest {
+
+    @RegisterExtension
+    static final QuarkusUnitTest config = new QuarkusUnitTest()
+            .withApplicationRoot((jar) -> jar
+                    .addClasses(Foo.class, ServiceAlpha.class, ServiceBravo.class, Service.class,
+                            Converter.class, ConverterAlpha.class, ConverterBravo.class));
+
+    @Inject
+    Foo foo;
+
+    @Test
+    public void testInjection() {
+        assertThat(foo.services).hasSize(2).extractingResultOf("ping").containsExactlyInAnyOrder("alpha", "bravo");
+        assertThat(foo.converters).hasSize(2).extractingResultOf("pong").containsExactlyInAnyOrder("alpha", "bravo");
+    }
+
+    @org.springframework.stereotype.Service
+    public static class Foo {
+
+        @Autowired
+        List<Service> services;
+
+        final List<Converter> converters;
+
+        Foo(@All List<Converter> converters) {
+            this.converters = converters;
+        }
+
+    }
+
+    public interface Service {
+
+        String ping();
+    }
+
+    public interface Converter {
+
+        String pong();
+    }
+
+    @Component
+    public static class ServiceAlpha implements Service {
+
+        public String ping() {
+            return "alpha";
+        }
+    }
+
+    @Component
+    public static class ServiceBravo implements Service {
+
+        public String ping() {
+            return "bravo";
+        }
+    }
+
+    @org.springframework.stereotype.Service
+    public static class ConverterAlpha implements Converter {
+
+        @Override
+        public String pong() {
+            return "alpha";
+        }
+
+    }
+
+    @Repository
+    public static class ConverterBravo implements Converter {
+
+        @Override
+        public String pong() {
+            return "bravo";
+        }
+
+    }
+}