DefaultListableBeanFactory defensively handles BeanDefinition access in getBean(Class)

Issue: SPR-10542
(cherry picked from commit 9d3d6d5)

Author: jhoeller

spring-beans/src/main/java/org/springframework/beans/factory/support/DefaultListableBeanFactory.java

@@ -261,7 +261,7 @@ public <T> T getBean(Class<T> requiredType) throws BeansException {
 		if (beanNames.length > 1) {
 			ArrayList<String> autowireCandidates = new ArrayList<String>();
 			for (String beanName : beanNames) {
-				if (getBeanDefinition(beanName).isAutowireCandidate()) {
+				if (!containsBeanDefinition(beanName) || getBeanDefinition(beanName).isAutowireCandidate()) {
 					autowireCandidates.add(beanName);
 				}
 			}

spring-context/src/test/java/org/springframework/context/support/GenericApplicationContextTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2010 the original author or authors.
+ * Copyright 2002-2014 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,7 +18,11 @@
 
 import org.junit.Test;
 
+import org.springframework.beans.factory.NoUniqueBeanDefinitionException;
 import org.springframework.beans.factory.support.DefaultListableBeanFactory;
+import org.springframework.beans.factory.support.RootBeanDefinition;
+
+import static org.junit.Assert.*;
 
 /**
  * @author Juergen Hoeller
@@ -28,9 +32,27 @@ public class GenericApplicationContextTests {
 
 	@Test
 	public void nullBeanRegistration() {
-			DefaultListableBeanFactory bf = new DefaultListableBeanFactory();
-			bf.registerSingleton("nullBean", null);
-			new GenericApplicationContext(bf).refresh();
+		DefaultListableBeanFactory bf = new DefaultListableBeanFactory();
+		bf.registerSingleton("nullBean", null);
+		new GenericApplicationContext(bf).refresh();
+	}
+
+	@Test
+	public void getBeanForClass() {
+		GenericApplicationContext ac = new GenericApplicationContext();
+		ac.registerBeanDefinition("testBean", new RootBeanDefinition(String.class));
+		ac.refresh();
+
+		assertSame(ac.getBean("testBean"), ac.getBean(String.class));
+		assertSame(ac.getBean("testBean"), ac.getBean(CharSequence.class));
+
+		try {
+			assertSame(ac.getBean("testBean"), ac.getBean(Object.class));
+			fail("Should have thrown NoUniqueBeanDefinitionException");
+		}
+		catch (NoUniqueBeanDefinitionException ex) {
+			// expected
+		}
 	}
 
 }