[bs-130] Prevent double registration

* A simple check to see if it is already registered
fixed the original problem
* Also removed the need to have @ConfigurationProperties
on a bean class (unless you want to specify the target name
etc.)

[Fixes #50256421] [bs-130] When actuator app starts the
@ConfigurationProperties are registered with the bean
factory several times

spring-bootstrap-samples/spring-bootstrap-actuator-sample/src/main/resources/logging.properties

@@ -0,0 +1,6 @@
+handlers = java.util.logging.ConsoleHandler
+.level = INFO
+
+java.util.logging.ConsoleHandler.level = FINE
+sun.net.www.protocol.http.HttpURLConnection.level = ALL
+org.springframework.bootstrap.level = ALL

spring-bootstrap-samples/spring-bootstrap-actuator-sample/src/test/java/org/springframework/bootstrap/sample/service/ServiceBootstrapApplicationTests.java

@@ -50,7 +50,7 @@ public class ServiceBootstrapApplicationTests {
 										.run(ServiceBootstrapApplication.class);
 							}
 						});
-		context = future.get(10, TimeUnit.SECONDS);
+		context = future.get(30, TimeUnit.SECONDS);
 	}
 
 	@AfterClass

spring-bootstrap/src/main/java/org/springframework/bootstrap/context/annotation/EnableConfigurationPropertiesImportSelector.java

@@ -23,6 +23,7 @@ import org.springframework.beans.factory.support.BeanDefinitionBuilder;
 import org.springframework.beans.factory.support.BeanDefinitionRegistry;
 import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
 import org.springframework.context.annotation.ImportSelector;
+import org.springframework.core.annotation.AnnotationUtils;
 import org.springframework.core.type.AnnotationMetadata;
 import org.springframework.util.MultiValueMap;
 
@@ -64,8 +65,20 @@ public class EnableConfigurationPropertiesImportSelector implements ImportSelect
 							EnableConfigurationProperties.class.getName(), false);
 			List<Class<?>> types = collectClasses(attributes.get("value"));
 			for (Class<?> type : types) {
-				registry.registerBeanDefinition(type.getName(), BeanDefinitionBuilder
-						.genericBeanDefinition(type).getBeanDefinition());
+				String name = type.getName();
+				if (!registry.containsBeanDefinition(name)) {
+					registry.registerBeanDefinition(name, BeanDefinitionBuilder
+							.genericBeanDefinition(type).getBeanDefinition());
+					ConfigurationProperties properties = AnnotationUtils.findAnnotation(
+							type, ConfigurationProperties.class);
+					if (properties == null) {
+						BeanDefinitionBuilder builder = BeanDefinitionBuilder
+								.genericBeanDefinition(ConfigurationPropertiesHolder.class);
+						builder.addConstructorArgReference(name);
+						registry.registerBeanDefinition(name + ".HOLDER",
+								builder.getBeanDefinition());
+					}
+				}
 			}
 		}
 
@@ -83,4 +96,18 @@ public class EnableConfigurationPropertiesImportSelector implements ImportSelect
 
 	}
 
+	public static class ConfigurationPropertiesHolder {
+
+		private Object target;
+
+		public ConfigurationPropertiesHolder(Object target) {
+			this.target = target;
+		}
+
+		public Object getTarget() {
+			return this.target;
+		}
+
+	}
+
 }

spring-bootstrap/src/main/java/org/springframework/bootstrap/context/annotation/PropertySourcesBindingPostProcessor.java

@@ -20,6 +20,7 @@ import org.springframework.beans.BeansException;
 import org.springframework.beans.factory.BeanCreationException;
 import org.springframework.beans.factory.config.BeanPostProcessor;
 import org.springframework.bootstrap.bind.PropertiesConfigurationFactory;
+import org.springframework.bootstrap.context.annotation.EnableConfigurationPropertiesImportSelector.ConfigurationPropertiesHolder;
 import org.springframework.core.annotation.AnnotationUtils;
 import org.springframework.core.convert.ConversionService;
 import org.springframework.core.env.PropertySources;
@@ -68,19 +69,27 @@ public class PropertySourcesBindingPostProcessor implements BeanPostProcessor {
 			throws BeansException {
 		ConfigurationProperties annotation = AnnotationUtils.findAnnotation(
 				bean.getClass(), ConfigurationProperties.class);
-		if (annotation != null) {
+		Object target = bean;
+		if (annotation != null || bean instanceof ConfigurationPropertiesHolder) {
+			if (bean instanceof ConfigurationPropertiesHolder) {
+				target = ((ConfigurationPropertiesHolder) bean).getTarget();
+			}
 			PropertiesConfigurationFactory<Object> factory = new PropertiesConfigurationFactory<Object>(
-					bean);
+					target);
 			factory.setPropertySources(this.propertySources);
 			factory.setValidator(this.validator);
 			factory.setConversionService(this.conversionService);
-			factory.setIgnoreInvalidFields(annotation.ignoreInvalidFields());
-			factory.setIgnoreUnknownFields(annotation.ignoreUnknownFields());
-			String targetName = "".equals(annotation.value()) ? ("".equals(annotation
-					.name()) ? null : annotation.name()) : annotation.value();
+			String targetName = null;
+			if (annotation != null) {
+				factory.setIgnoreInvalidFields(annotation.ignoreInvalidFields());
+				factory.setIgnoreUnknownFields(annotation.ignoreUnknownFields());
+				targetName = "".equals(annotation.value()) ? (""
+						.equals(annotation.name()) ? null : annotation.name())
+						: annotation.value();
+			}
 			factory.setTargetName(targetName);
 			try {
-				bean = factory.getObject();
+				target = factory.getObject(); // throwaway
 			} catch (BeansException e) {
 				throw e;
 			} catch (Exception e) {

spring-bootstrap/src/test/java/org/springframework/bootstrap/context/annotation/EnableConfigurationPropertiesTests.java

@@ -0,0 +1,106 @@
+/*
+ * Copyright 2012-2013 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.bootstrap.context.annotation;
+
+import java.util.Collections;
+
+import org.junit.Test;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.env.MapPropertySource;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * @author Dave Syer
+ * 
+ */
+public class EnableConfigurationPropertiesTests {
+
+	private AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
+
+	@Test
+	public void testBasicPropertiesBinding() {
+		this.context.register(TestConfiguration.class);
+		this.context
+				.getEnvironment()
+				.getPropertySources()
+				.addFirst(
+						new MapPropertySource("test", Collections
+								.<String, Object> singletonMap("name", "foo")));
+		this.context.refresh();
+		assertEquals(1, this.context.getBeanNamesForType(TestProperties.class).length);
+		assertEquals("foo", this.context.getBean(TestProperties.class).getName());
+	}
+
+	@Test
+	public void testPropertiesBindingWithoutAnnotation() {
+		this.context.register(MoreConfiguration.class);
+		this.context
+				.getEnvironment()
+				.getPropertySources()
+				.addFirst(
+						new MapPropertySource("test", Collections
+								.<String, Object> singletonMap("name", "foo")));
+		this.context.refresh();
+		assertEquals(1, this.context.getBeanNamesForType(MoreProperties.class).length);
+		assertEquals("foo", this.context.getBean(MoreProperties.class).getName());
+	}
+
+	@Test
+	public void testBindingWithTwoBeans() {
+		this.context.register(MoreConfiguration.class, TestConfiguration.class);
+		this.context.refresh();
+		assertEquals(1, this.context.getBeanNamesForType(TestProperties.class).length);
+		assertEquals(1, this.context.getBeanNamesForType(MoreProperties.class).length);
+	}
+
+	@Configuration
+	@EnableConfigurationProperties(TestProperties.class)
+	protected static class TestConfiguration {
+	}
+
+	@Configuration
+	@EnableConfigurationProperties(MoreProperties.class)
+	protected static class MoreConfiguration {
+	}
+
+	@ConfigurationProperties
+	protected static class TestProperties {
+		private String name;
+
+		public String getName() {
+			return this.name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+	}
+
+	protected static class MoreProperties {
+		private String name;
+
+		public String getName() {
+			return this.name;
+		}
+
+		public void setName(String name) {
+			this.name = name;
+		}
+	}
+
+}