Create a report based on Boot's autoconfiguration decisions

- Gather autoconfiguration conditional decisiions (true and false)
- Provide an actuator endpoint as one means to read the report
- Define @EnableAutConfigurationReport annotation to turn this feature on
- Tidy up autoconfig report a bit and log it if --debug=true

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/autoconfigure/EndpointAutoConfiguration.java

@@ -22,6 +22,7 @@ import java.util.Properties;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.actuate.endpoint.AutoConfigurationReportEndpoint;
 import org.springframework.boot.actuate.endpoint.BeansEndpoint;
 import org.springframework.boot.actuate.endpoint.DumpEndpoint;
 import org.springframework.boot.actuate.endpoint.Endpoint;
@@ -41,7 +42,9 @@ import org.springframework.boot.actuate.trace.InMemoryTraceRepository;
 import org.springframework.boot.actuate.trace.TraceRepository;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.report.AutoConfigurationReport;
 import org.springframework.boot.bind.PropertiesConfigurationFactory;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -54,9 +57,10 @@ import org.springframework.http.MediaType;
 /**
  * {@link EnableAutoConfiguration Auto-configuration} for common management
  * {@link Endpoint}s.
- * 
+ *
  * @author Dave Syer
  * @author Phillip Webb
+ * @author Greg Turnquist
  */
 @Configuration
 @ConditionalOnClass(MediaType.class)
@@ -128,6 +132,13 @@ public class EndpointAutoConfiguration {
 		return new DumpEndpoint();
 	}
 
+	@Bean
+	@ConditionalOnBean(AutoConfigurationReport.class)
+	@ConditionalOnMissingBean
+	public AutoConfigurationReportEndpoint autoConfigurationAuditEndpoint() {
+		return new AutoConfigurationReportEndpoint();
+	}
+
 	@Bean
 	@ConditionalOnMissingBean
 	public ShutdownEndpoint shutdownEndpoint() {
@@ -139,7 +150,6 @@ public class EndpointAutoConfiguration {
 
 		@Autowired
 		private ConfigurableEnvironment environment = new StandardEnvironment();
-
 		@Value("${spring.git.properties:classpath:git.properties}")
 		private Resource gitProperties;
 

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/autoconfigure/ErrorMvcAutoConfiguration.java

@@ -32,6 +32,7 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
+import org.springframework.boot.autoconfigure.condition.Outcome;
 import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
 import org.springframework.boot.autoconfigure.thymeleaf.ThymeleafAutoConfiguration.DefaultTemplateResolverConfiguration;
 import org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration;

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

@@ -0,0 +1,43 @@
+/*
+ * 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.boot.actuate.endpoint;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.report.AutoConfigurationReport;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+/**
+ * Endpoint to serve up autoconfiguration report if actuator is on the classpath.
+ *
+ * @author Greg Turnquist
+ */
+@ConfigurationProperties(name = "endpoints.autoconfigurationreport", ignoreUnknownFields = false)
+public class AutoConfigurationReportEndpoint extends AbstractEndpoint<AutoConfigurationReport> {
+
+	@Autowired
+	private AutoConfigurationReport autoConfigurationReport;
+
+	public AutoConfigurationReportEndpoint() {
+		super("/autoconfigurationreport");
+	}
+
+	@Override
+	public AutoConfigurationReport invoke() {
+		return this.autoConfigurationReport;
+	}
+
+}