Clarify BeanFactory#containsBean Javadoc

Previously, #containsBean Javadoc advertised that a true return value
indicates that a call to #getBean for the same name would succeed.

This is actually not the case, and has never been.  The semantics
of #containsBean have always been to indicate whether a bean definition
with the given name is definied or a singleton instance with the given
name has been registered.

The Javadoc now reflects this accurately.

Issue: SPR-8690

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2010 the original author or authors.
+ * Copyright 2002-2011 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.
@@ -181,12 +181,19 @@ public interface BeanFactory {
 	Object getBean(String name, Object... args) throws BeansException;
 
 	/**
-	 * Does this bean factory contain a bean with the given name? More specifically,
-	 * is {@link #getBean} able to obtain a bean instance for the given name?
-	 * <p>Translates aliases back to the corresponding canonical bean name.
-	 * Will ask the parent factory if the bean cannot be found in this factory instance.
+	 * Does this bean factory contain a bean definition or externally registered singleton
+	 * instance with the given name?
+	 * <p>If the given name is an alias, it will be translated back to the corresponding
+	 * canonical bean name.
+	 * <p>If this factory is hierarchical, will ask any parent factory if the bean cannot
+	 * be found in this factory instance.
+	 * <p>If a bean definition or singleton instance matching the given name is found,
+	 * this method will return {@code true} whether the named bean definition is concrete
+	 * or abstract, lazy or eager, in scope or not. Therefore, note that a {@code true}
+	 * return value from this method does not necessarily indicate that {@link #getBean}
+	 * will be able to obtain an instance for the same name.
 	 * @param name the name of the bean to query
-	 * @return whether a bean with the given name is defined
+	 * @return whether a bean with the given name is present
 	 */
 	boolean containsBean(String name);
 

org.springframework.beans/src/test/java/org/springframework/beans/factory/DefaultListableBeanFactoryTests.java

@@ -16,14 +16,17 @@
 
 package org.springframework.beans.factory;
 
+import static org.hamcrest.CoreMatchers.is;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNotSame;
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertSame;
+import static org.junit.Assert.assertThat;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
+import static org.springframework.beans.factory.support.BeanDefinitionBuilder.rootBeanDefinition;
 
 import java.lang.reflect.Field;
 import java.net.MalformedURLException;
@@ -74,7 +77,6 @@ import org.springframework.beans.factory.support.RootBeanDefinition;
 import org.springframework.beans.factory.xml.ConstructorDependenciesBean;
 import org.springframework.beans.factory.xml.DependenciesBean;
 import org.springframework.beans.propertyeditors.CustomNumberEditor;
-import org.springframework.core.LocalVariableTableParameterNameDiscoverer;
 import org.springframework.core.MethodParameter;
 import org.springframework.core.convert.converter.Converter;
 import org.springframework.core.convert.support.DefaultConversionService;
@@ -2154,6 +2156,15 @@ public class DefaultListableBeanFactoryTests {
 		assertEquals("user1", bean.getUserName());
 	}
 
+	@Test
+	public void testContainsBeanReturnsTrueEvenForAbstractBeanDefinition() {
+		DefaultListableBeanFactory bf = new DefaultListableBeanFactory();
+		bf.registerBeanDefinition("abs",
+				rootBeanDefinition(TestBean.class).setAbstract(true).getBeanDefinition());
+		assertThat(bf.containsBean("abs"), is(true));
+		assertThat(bf.containsBean("bogus"), is(false));
+	}
+
 
 	public static class NoDependencies {