Clarify Javadoc of ConditionalOn annotations

Closes gh-14681

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/ConditionalOnBean.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2018 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.
@@ -24,13 +24,14 @@ import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
 import org.springframework.beans.factory.BeanFactory;
-import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Conditional;
 
 /**
- * {@link Conditional} that only matches when the specified bean classes and/or names are
+ * {@link Conditional} that only matches when beans of the specified classes and/or with
- * already contained in the {@link BeanFactory}. When placed on a {@code @Bean} method,
+ * the specified names are already contained in the {@link BeanFactory}.
- * the bean class defaults to the return type of the factory method:
+ * <p>
+ * When placed on a {@code @Bean} method, the bean class defaults to the return type of
+ * the factory method:
  *
  * <pre class="code">
  * &#064;Configuration
@@ -61,15 +62,15 @@ import org.springframework.context.annotation.Conditional;
 public @interface ConditionalOnBean {
 
 	/**
-	 * The class type of bean that should be checked. The condition matches when all of
+	 * The class types of beans that should be checked. The condition matches when beans
-	 * the classes specified are contained in the {@link ApplicationContext}.
+	 * of all classes specified are contained in the {@link BeanFactory}.
 	 * @return the class types of beans to check
 	 */
 	Class<?>[] value() default {};
 
 	/**
-	 * The class type names of bean that should be checked. The condition matches when all
+	 * The class type names of beans that should be checked. The condition matches when
-	 * of the classes specified are contained in the {@link ApplicationContext}.
+	 * beans of all classes specified are contained in the {@link BeanFactory}.
 	 * @return the class type names of beans to check
 	 */
 	String[] type() default {};
@@ -77,15 +78,15 @@ public @interface ConditionalOnBean {
 	/**
 	 * The annotation type decorating a bean that should be checked. The condition matches
 	 * when all of the annotations specified are defined on beans in the
-	 * {@link ApplicationContext}.
+	 * {@link BeanFactory}.
 	 * @return the class-level annotation types to check
 	 */
 	Class<? extends Annotation>[] annotation() default {};
 
 	/**
 	 * The names of beans to check. The condition matches when all of the bean names
-	 * specified are contained in the {@link ApplicationContext}.
+	 * specified are contained in the {@link BeanFactory}.
-	 * @return the name of beans to check
+	 * @return the names of beans to check
 	 */
 	String[] name() default {};
 

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/ConditionalOnMissingBean.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2018 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.
@@ -24,12 +24,11 @@ import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
 import org.springframework.beans.factory.BeanFactory;
-import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Conditional;
 
 /**
- * {@link Conditional} that only matches when the specified bean classes and/or names are
+ * {@link Conditional} that only matches when no beans of the specified classes and/or
- * not already contained in the {@link BeanFactory}.
+ * with the specified names are already contained in the {@link BeanFactory}.
  * <p>
  * When placed on a {@code @Bean} method, the bean class defaults to the return type of
  * the factory method:
@@ -64,21 +63,21 @@ import org.springframework.context.annotation.Conditional;
 public @interface ConditionalOnMissingBean {
 
 	/**
-	 * The class type of bean that should be checked. The condition matches when each
+	 * The class types of beans that should be checked. The condition matches when no bean
-	 * class specified is missing in the {@link ApplicationContext}.
+	 * of each class specified is contained in the {@link BeanFactory}.
 	 * @return the class types of beans to check
 	 */
 	Class<?>[] value() default {};
 
 	/**
-	 * The class type names of bean that should be checked. The condition matches when
+	 * The class type names of beans that should be checked. The condition matches when no
-	 * each class specified is missing in the {@link ApplicationContext}.
+	 * bean of each class specified is contained in the {@link BeanFactory}.
 	 * @return the class type names of beans to check
 	 */
 	String[] type() default {};
 
 	/**
-	 * The class type of beans that should be ignored when identifying matching beans.
+	 * The class types of beans that should be ignored when identifying matching beans.
 	 * @return the class types of beans to ignore
 	 * @since 1.2.5
 	 */
@@ -95,15 +94,15 @@ public @interface ConditionalOnMissingBean {
 	/**
 	 * The annotation type decorating a bean that should be checked. The condition matches
 	 * when each annotation specified is missing from all beans in the
-	 * {@link ApplicationContext}.
+	 * {@link BeanFactory}.
 	 * @return the class-level annotation types to check
 	 */
 	Class<? extends Annotation>[] annotation() default {};
 
 	/**
 	 * The names of beans to check. The condition matches when each bean name specified is
-	 * missing in the {@link ApplicationContext}.
+	 * missing in the {@link BeanFactory}.
-	 * @return the name of beans to check
+	 * @return the names of beans to check
 	 */
 	String[] name() default {};
 

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/ConditionalOnSingleCandidate.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2018 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.
@@ -23,11 +23,10 @@ import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
 import org.springframework.beans.factory.BeanFactory;
-import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Conditional;
 
 /**
- * {@link Conditional} that only matches when the specified bean class is already
+ * {@link Conditional} that only matches when a bean of the specified class is already
  * contained in the {@link BeanFactory} and a single candidate can be determined.
  * <p>
  * The condition will also match if multiple matching bean instances are already contained
@@ -49,8 +48,8 @@ import org.springframework.context.annotation.Conditional;
 public @interface ConditionalOnSingleCandidate {
 
 	/**
-	 * The class type of bean that should be checked. The condition match if the class
+	 * The class type of bean that should be checked. The condition matches if a bean of
-	 * specified is contained in the {@link ApplicationContext} and a primary candidate
+	 * the class specified is contained in the {@link BeanFactory} and a primary candidate
 	 * exists in case of multiple instances.
 	 * <p>
 	 * This attribute may <strong>not</strong> be used in conjunction with
@@ -60,8 +59,8 @@ public @interface ConditionalOnSingleCandidate {
 	Class<?> value() default Object.class;
 
 	/**
-	 * The class type name of bean that should be checked. The condition matches if the
+	 * The class type name of bean that should be checked. The condition matches if a bean
-	 * class specified is contained in the {@link ApplicationContext} and a primary
+	 * of the class specified is contained in the {@link BeanFactory} and a primary
 	 * candidate exists in case of multiple instances.
 	 * <p>
 	 * This attribute may <strong>not</strong> be used in conjunction with