Merge pull request #9052 from strattonw:issue-3269

* pr/9052:
  Polish "Fix configuration properties output for actuator"
  Fix configuration properties output for actuator

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/ConfigurationPropertiesReportEndpoint.java

@@ -17,6 +17,7 @@
 package org.springframework.boot.actuate.endpoint;
 
 import java.util.ArrayList;
+import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
@@ -57,6 +58,7 @@ import org.springframework.util.StringUtils;
  *
  * @author Christian Dupuis
  * @author Dave Syer
+ * @author Stephane Nicoll
  */
 @ConfigurationProperties(prefix = "endpoints.configprops")
 public class ConfigurationPropertiesReportEndpoint
@@ -334,10 +336,13 @@ public class ConfigurationPropertiesReportEndpoint
 			// If there's a setter, we assume it's OK to report on the value,
 			// similarly, if there's no setter but the package names match, we assume
 			// that its a nested class used solely for binding to config props, so it
-			// should be kosher. This filter is not used if there is JSON metadata for
-			// the property, so it's mainly for user-defined beans.
-			return (setter != null) || ClassUtils.getPackageName(parentType)
-					.equals(ClassUtils.getPackageName(type));
+			// should be kosher. Lists and Maps are also auto-detected by default since
+			// that's what the metadata generator does. This filter is not used if there
+			// is JSON metadata for the property, so it's mainly for user-defined beans.
+			return (setter != null)
+					|| ClassUtils.getPackageName(parentType).equals(ClassUtils.getPackageName(type))
+					|| Map.class.isAssignableFrom(type)
+					|| Collection.class.isAssignableFrom(type);
 		}
 
 		private AnnotatedMethod findSetter(BeanDescription beanDesc,
@@ -354,5 +359,4 @@ public class ConfigurationPropertiesReportEndpoint
 		}
 
 	}
-
 }

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/ConfigurationPropertiesReportEndpointSerializationTests.java

@@ -17,6 +17,8 @@
 package org.springframework.boot.actuate.endpoint;
 
 import java.net.InetAddress;
+import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
@@ -33,11 +35,13 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Import;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.entry;
 
 /**
  * Tests for {@link ConfigurationPropertiesReportEndpoint} serialization.
  *
  * @author Dave Syer
+ * @author Stephane Nicoll
  */
 public class ConfigurationPropertiesReportEndpointSerializationTests {
 
@@ -195,6 +199,32 @@ public class ConfigurationPropertiesReportEndpointSerializationTests {
 		assertThat(map.get("address")).isEqualTo("192.168.1.10");
 	}
 
+	@Test
+	@SuppressWarnings("unchecked")
+	public void testInitializedMapAndList() throws Exception {
+		this.context.register(InitializedMapAndListPropertiesConfig.class);
+		EnvironmentTestUtils.addEnvironment(this.context, "foo.map.entryOne:true",
+				"foo.list[0]:abc");
+		this.context.refresh();
+		ConfigurationPropertiesReportEndpoint report = this.context
+				.getBean(ConfigurationPropertiesReportEndpoint.class);
+		Map<String, Object> properties = report.invoke();
+		assertThat(properties).containsKeys("foo");
+		Map<String, Object> nestedProperties = (Map<String, Object>) properties
+				.get("foo");
+		assertThat(nestedProperties).containsOnlyKeys("prefix", "properties");
+		assertThat(nestedProperties.get("prefix")).isEqualTo("foo");
+		Map<String, Object> propertiesMap = (Map<String, Object>) nestedProperties
+				.get("properties");
+		assertThat(propertiesMap).containsOnlyKeys("bar", "name", "map", "list");
+		Map<String, Object> map = (Map<String, Object>) propertiesMap
+				.get("map");
+		assertThat(map).containsOnly(entry("entryOne", true));
+		List<String> list = (List<String>) propertiesMap
+				.get("list");
+		assertThat(list).containsExactly("abc");
+	}
+
 	@Configuration
 	@EnableConfigurationProperties
 	public static class Base {
@@ -290,6 +320,18 @@ public class ConfigurationPropertiesReportEndpointSerializationTests {
 
 	}
 
+	@Configuration
+	@Import(Base.class)
+	public static class InitializedMapAndListPropertiesConfig {
+
+		@Bean
+		@ConfigurationProperties(prefix = "foo")
+		public InitializedMapAndListProperties foo() {
+			return new InitializedMapAndListProperties();
+		}
+
+	}
+
 	public static class Foo {
 
 		private String name = "654321";
@@ -393,4 +435,20 @@ public class ConfigurationPropertiesReportEndpointSerializationTests {
 
 	}
 
+	public static class InitializedMapAndListProperties extends Foo {
+
+		private Map<String, Boolean> map = new HashMap<String, Boolean>();
+
+		private List<String> list = new ArrayList<String>();
+
+		public Map<String, Boolean> getMap() {
+			return this.map;
+		}
+
+		public List<String> getList() {
+			return this.list;
+		}
+
+	}
+
 }