Force factory method to be resolved

SPR-8891 is still in flux. It might settle down so we don't need
the hack, but for now this is needed to make the factory method
for converter beans available in time to select them by qualifier.

Author: Dave Syer

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/ConversionServiceDeducer.java

@@ -23,12 +23,15 @@
 import org.springframework.beans.factory.ListableBeanFactory;
 import org.springframework.beans.factory.NoSuchBeanDefinitionException;
 import org.springframework.beans.factory.annotation.BeanFactoryAnnotationUtils;
+import org.springframework.beans.factory.config.DependencyDescriptor;
+import org.springframework.beans.factory.support.DefaultListableBeanFactory;
 import org.springframework.boot.convert.ApplicationConversionService;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.core.convert.ConversionService;
 import org.springframework.core.convert.converter.Converter;
 import org.springframework.core.convert.converter.GenericConverter;
+import org.springframework.util.ReflectionUtils;
 
 /**
  * Utility to deduce the {@link ConversionService} to use for configuration properties
@@ -58,6 +61,9 @@ public ConversionService getConversionService() {
 
 	private static class Factory {
 
+		private static DependencyDescriptor DUMMY = new DependencyDescriptor(
+				ReflectionUtils.findField(Factory.class, "genericConverters"), false);
+
 		/**
 		 * A list of custom converters (in addition to the defaults) to use when
 		 * converting properties for binding.
@@ -85,6 +91,13 @@ private static <T> List<T> beans(BeanFactory beanFactory, Class<T> type,
 				return list;
 			}
 			ListableBeanFactory listable = (ListableBeanFactory) beanFactory;
+			if (listable instanceof DefaultListableBeanFactory) {
+				for (String name : listable.getBeanNamesForType(type)) {
+					// Force bean definition to resolve its factory method
+					((DefaultListableBeanFactory) listable).isAutowireCandidate(name,
+							DUMMY);
+				}
+			}
 			list.addAll(BeanFactoryAnnotationUtils
 					.qualifiedBeansOfType(listable, type, qualifier).values());
 			return list;