Gracefully ignore placeholder exceptions

Update BeanTypeRegistry to gracefully ignore LoadBeanClassException and
BeanDefinitionStoreException exceptions in the same way as
DefaultListableBeanFactory.doGetBeanNamesForType() does.

Fixes gh-1955

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

@@ -24,8 +24,12 @@ import java.util.LinkedHashSet;
 import java.util.Map;
 import java.util.Set;
 
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.springframework.beans.factory.BeanDefinitionStoreException;
 import org.springframework.beans.factory.BeanFactory;
 import org.springframework.beans.factory.BeanFactoryUtils;
+import org.springframework.beans.factory.CannotLoadBeanClassException;
 import org.springframework.beans.factory.FactoryBean;
 import org.springframework.beans.factory.ListableBeanFactory;
 import org.springframework.beans.factory.SmartInitializingSingleton;
@@ -54,7 +58,7 @@ import org.springframework.util.StringUtils;
  */
 abstract class BeanTypeRegistry {
 
-	public static long check;
+	static Log logger = LogFactory.getLog(BeanTypeRegistry.class);
 
 	static final String FACTORY_BEAN_OBJECT_TYPE = "factoryBeanObjectType";
 
@@ -239,6 +243,12 @@ abstract class BeanTypeRegistry {
 				this.beanTypes.put(name, this.beanFactory.getType(name));
 			}
 			else if (!this.beanFactory.isAlias(name)) {
+				addBeanTypeForNonAliasDefinition(name);
+			}
+		}
+
+		private void addBeanTypeForNonAliasDefinition(String name) {
+			try {
 				String factoryName = BeanFactory.FACTORY_BEAN_PREFIX + name;
 				RootBeanDefinition beanDefinition = (RootBeanDefinition) this.beanFactory
 						.getMergedBeanDefinition(name);
@@ -256,6 +266,21 @@ abstract class BeanTypeRegistry {
 					}
 				}
 			}
+			catch (CannotLoadBeanClassException ex) {
+				// Probably contains a placeholder
+				logIgnoredError("bean class loading failure for bean", name, ex);
+			}
+			catch (BeanDefinitionStoreException ex) {
+				// Probably contains a placeholder
+				logIgnoredError("unresolvable metadata in bean definition", name, ex);
+			}
+		}
+
+		private void logIgnoredError(String message, String name, Exception ex) {
+			if (BeanTypeRegistry.logger.isDebugEnabled()) {
+				BeanTypeRegistry.logger.debug("Ignoring " + message + " '" + name + "'",
+						ex);
+			}
 		}
 
 		private boolean requiresEagerInit(String factoryBeanName) {

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/condition/ConditionalOnBeanTests.java

@@ -19,11 +19,17 @@ package org.springframework.boot.autoconfigure.condition;
 import java.util.Date;
 
 import org.junit.Test;
+import org.springframework.beans.factory.support.BeanDefinitionRegistry;
+import org.springframework.beans.factory.support.RootBeanDefinition;
+import org.springframework.boot.test.EnvironmentTestUtils;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Import;
+import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
 import org.springframework.context.annotation.ImportResource;
+import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
+import org.springframework.core.type.AnnotationMetadata;
 import org.springframework.scheduling.annotation.EnableScheduling;
 
 import static org.junit.Assert.assertEquals;
@@ -116,6 +122,14 @@ public class ConditionalOnBeanTests {
 		assertFalse(this.context.containsBean("bar"));
 	}
 
+	@Test
+	public void withPropertyPlaceholderClassName() throws Exception {
+		EnvironmentTestUtils.addEnvironment(this.context, "mybeanclass=java.lang.String");
+		this.context.register(PropertySourcesPlaceholderConfigurer.class,
+				WithPropertyPlaceholderClassName.class, OnBeanClassConfiguration.class);
+		this.context.refresh();
+	}
+
 	@Configuration
 	@ConditionalOnBean(name = "foo")
 	protected static class OnBeanNameConfiguration {
@@ -189,4 +203,24 @@ public class ConditionalOnBeanTests {
 	@Import(OnBeanNameConfiguration.class)
 	protected static class CombinedXmlConfiguration {
 	}
+
+	@Configuration
+	@Import(WithPropertyPlaceholderClassNameRegistrar.class)
+	protected static class WithPropertyPlaceholderClassName {
+
+	}
+
+	protected static class WithPropertyPlaceholderClassNameRegistrar implements
+			ImportBeanDefinitionRegistrar {
+
+		@Override
+		public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata,
+				BeanDefinitionRegistry registry) {
+			RootBeanDefinition bd = new RootBeanDefinition();
+			bd.setBeanClassName("${mybeanclass}");
+			registry.registerBeanDefinition("mybean", bd);
+		}
+
+	}
+
 }