added first cut of getBean(Class) lookup method

org.springframework.beans/src/main/java/org/springframework/beans/factory/BeanFactory.java

@@ -149,6 +149,15 @@ public interface BeanFactory {
 	 */
 	<T> T getBean(String name, Class<T> requiredType) throws BeansException;
 
+	/**
+	 * Return the bean instance that uniquely matches the given object type, if any.
+	 * @param requiredType type the bean must match; can be an interface or superclass.
+	 * {@literal null} is disallowed.
+	 * @return bean matching required type
+	 * @throws NoSuchBeanDefinitionException if there is not exactly one matching bean found
+	 */
+	<T> T getBean(Class<T> requiredType) throws BeansException;
+
 	/**
 	 * Return an instance, which may be shared or independent, of the specified bean.
 	 * <p>Allows for specifying explicit constructor arguments / factory method arguments,

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

@@ -242,6 +242,19 @@ public class DefaultListableBeanFactory extends AbstractAutowireCapableBeanFacto
 	// Implementation of ListableBeanFactory interface
 	//---------------------------------------------------------------------
 
+	public <T> T getBean(Class<T> requiredType) throws BeansException {
+		String[] beanNames = getBeanNamesForType(requiredType);
+		if (beanNames.length == 1) {
+			return getBean(beanNames[0], requiredType);
+		}
+		else if (beanNames.length == 0 && getParentBeanFactory() != null) {
+			return getParentBeanFactory().getBean(requiredType);
+		}
+		else {
+			throw new NoSuchBeanDefinitionException(requiredType, "expected single bean but found " + beanNames.length);
+		}
+	}
+
 	@Override
 	public boolean containsBeanDefinition(String beanName) {
 		return this.beanDefinitionMap.containsKey(beanName);

org.springframework.beans/src/main/java/org/springframework/beans/factory/support/StaticListableBeanFactory.java

@@ -112,6 +112,16 @@ public class StaticListableBeanFactory implements ListableBeanFactory {
 		return (T) bean;
 	}
 
+	public <T> T getBean(Class<T> requiredType) throws BeansException {
+		String[] beanNames = getBeanNamesForType(requiredType);
+		if (beanNames.length == 1) {
+			return getBean(beanNames[0], requiredType);
+		}
+		else {
+			throw new NoSuchBeanDefinitionException(requiredType, "expected single bean but found " + beanNames.length);
+		}
+	}
+
 	public Object getBean(String name, Object... args) throws BeansException {
 		if (args != null) {
 			throw new UnsupportedOperationException(

org.springframework.beans/src/test/java/org/springframework/beans/factory/xml/AbstractBeanFactoryTests.java

@@ -64,7 +64,7 @@ public abstract class AbstractBeanFactoryTests extends TestCase {
 
 	public void testGetBeanWithNullArg() {
 		try {
-			getBeanFactory().getBean(null);
+			getBeanFactory().getBean((String) null);
 			fail("Can't get null bean");
 		}
 		catch (IllegalArgumentException ex) {

org.springframework.context/src/main/java/org/springframework/context/support/AbstractApplicationContext.java

@@ -892,6 +892,10 @@ public abstract class AbstractApplicationContext extends DefaultResourceLoader
 		return getBeanFactory().getBean(name, requiredType);
 	}
 
+	public <T> T getBean(Class<T> requiredType) throws BeansException {
+		return getBeanFactory().getBean(requiredType);
+	}
+
 	public Object getBean(String name, Object... args) throws BeansException {
 		return getBeanFactory().getBean(name, args);
 	}

org.springframework.context/src/main/java/org/springframework/jndi/support/SimpleJndiBeanFactory.java

@@ -118,6 +118,10 @@ public class SimpleJndiBeanFactory extends JndiLocatorSupport implements BeanFac
 		}
 	}
 
+	public <T> T getBean(Class<T> requiredType) throws BeansException {
+		return getBean(requiredType.getSimpleName(), requiredType);
+	}
+
 	public Object getBean(String name, Object... args) throws BeansException {
 		if (args != null) {
 			throw new UnsupportedOperationException(

org.springframework.context/src/test/java/org/springframework/context/annotation/jsr330/SpringAtInjectTck.java

@@ -31,10 +31,7 @@ import org.atinject.tck.auto.accessories.SpareTire;
 
 import org.springframework.beans.factory.annotation.AnnotatedBeanDefinition;
 import org.springframework.beans.factory.config.BeanDefinition;
-import org.springframework.beans.factory.support.AutowireCandidateQualifier;
-import org.springframework.beans.factory.support.GenericBeanDefinition;
 import org.springframework.context.annotation.AnnotatedBeanDefinitionReader;
-import org.springframework.context.annotation.AnnotationConfigUtils;
 import org.springframework.context.annotation.Primary;
 import org.springframework.context.annotation.ScopeMetadata;
 import org.springframework.context.annotation.ScopeMetadataResolver;
@@ -71,59 +68,9 @@ public class SpringAtInjectTck {
 		bdr.registerBean(FuelTank.class);
 
 		ac.refresh();
-		Car car = ac.getBean("convertible", Car.class);
+		Car car = ac.getBean(Car.class);
 
 		return Tck.testsFor(car, false, true);
 	}
 
-	public static Test suiteX() {
-		GenericApplicationContext ac = new GenericApplicationContext();
-
-		GenericBeanDefinition carDef = new GenericBeanDefinition();
-		carDef.setScope(GenericBeanDefinition.SCOPE_PROTOTYPE);
-		carDef.setBeanClass(Convertible.class);
-		ac.registerBeanDefinition("car", carDef);
-
-		GenericBeanDefinition driversSeatDef = new GenericBeanDefinition();
-		driversSeatDef.setScope(GenericBeanDefinition.SCOPE_PROTOTYPE);
-		driversSeatDef.setBeanClass(DriversSeat.class);
-		driversSeatDef.addQualifier(new AutowireCandidateQualifier(Drivers.class));
-		ac.registerBeanDefinition("driversSeat", driversSeatDef);
-
-		GenericBeanDefinition seatDef = new GenericBeanDefinition();
-		seatDef.setBeanClass(Seat.class);
-		seatDef.setPrimary(true);
-		ac.registerBeanDefinition("seat", seatDef);
-
-		GenericBeanDefinition engineDef = new GenericBeanDefinition();
-		engineDef.setScope(GenericBeanDefinition.SCOPE_PROTOTYPE);
-		engineDef.setBeanClass(V8Engine.class);
-		ac.registerBeanDefinition("engine", engineDef);
-
-		GenericBeanDefinition spareDef = new GenericBeanDefinition();
-		spareDef.setScope(GenericBeanDefinition.SCOPE_PROTOTYPE);
-		spareDef.setBeanClass(SpareTire.class);
-		spareDef.addQualifier(new AutowireCandidateQualifier(Drivers.class));
-		ac.registerBeanDefinition("spare", spareDef);
-
-		GenericBeanDefinition cupholderDef = new GenericBeanDefinition();
-		cupholderDef.setBeanClass(Cupholder.class);
-		ac.registerBeanDefinition("cupholder", cupholderDef);
-
-		GenericBeanDefinition tireDef = new GenericBeanDefinition();
-		tireDef.setScope(GenericBeanDefinition.SCOPE_PROTOTYPE);
-		tireDef.setBeanClass(Tire.class);
-		tireDef.setPrimary(true);
-		ac.registerBeanDefinition("tire", tireDef);
-
-		GenericBeanDefinition fuelTankDef = new GenericBeanDefinition();
-		fuelTankDef.setBeanClass(FuelTank.class);
-		ac.registerBeanDefinition("fuelTank", fuelTankDef);
-
-		AnnotationConfigUtils.registerAnnotationConfigProcessors(ac);
-		ac.refresh();
-		Car car = ac.getBean("car", Car.class);
-		return Tck.testsFor(car, false, true);
-	}
-
 }