Check factory method metadata to avoid NPE in devtools condition

Closes gh-6056

spring-boot-devtools/src/main/java/org/springframework/boot/devtools/autoconfigure/DevToolsDataSourceAutoConfiguration.java

@@ -140,6 +140,8 @@ public class DevToolsDataSourceAutoConfiguration {
 			BeanDefinition dataSourceDefinition = context.getRegistry()
 					.getBeanDefinition(dataSourceBeanNames[0]);
 			if (dataSourceDefinition instanceof AnnotatedBeanDefinition
+					&& ((AnnotatedBeanDefinition) dataSourceDefinition)
+							.getFactoryMethodMetadata() != null
 					&& ((AnnotatedBeanDefinition) dataSourceDefinition)
 							.getFactoryMethodMetadata().getDeclaringClassName()
 							.startsWith(DataSourceAutoConfiguration.class.getName())) {

spring-boot-devtools/src/test/java/org/springframework/boot/devtools/autoconfigure/AbstractDevToolsDataSourceAutoConfigurationTests.java

@@ -26,6 +26,7 @@ import javax.sql.DataSource;
 import org.junit.Test;
 
 import org.springframework.beans.BeansException;
+import org.springframework.beans.factory.annotation.AnnotatedGenericBeanDefinition;
 import org.springframework.beans.factory.config.BeanPostProcessor;
 import org.springframework.boot.autoconfigure.jdbc.DataSourceProperties;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
@@ -72,6 +73,20 @@ public class AbstractDevToolsDataSourceAutoConfigurationTests {
 		}
 	}
 
+	@Test
+	public void emptyFactoryMethodMetadataIgnored() {
+		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
+
+		DataSource dataSource = mock(DataSource.class);
+		AnnotatedGenericBeanDefinition beanDefinition = new AnnotatedGenericBeanDefinition(
+				dataSource.getClass());
+		context.registerBeanDefinition("dataSource", beanDefinition);
+		context.register(DataSourcePropertiesConfiguration.class);
+		context.register(DevToolsDataSourceAutoConfiguration.class);
+		context.refresh();
+		context.close();
+	}
+
 	protected final Statement configureDataSourceBehaviour(DataSource dataSource)
 			throws SQLException {
 		Connection connection = mock(Connection.class);