Reinstate devtools debug logging with opt-out

Reinstate `web` logging when devtools is in use, making use of the new
logging groups support. Devtools now also logs an `INFO` message
informing that properties defaults are offers an easy way to disable
them.

Closes gh-14450

spring-boot-project/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/env/DevToolsPropertyDefaultsPostProcessor.java

@@ -20,7 +20,10 @@ import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
 
+import org.apache.commons.logging.Log;
+
 import org.springframework.boot.SpringApplication;
+import org.springframework.boot.devtools.logger.DevToolsLogFactory;
 import org.springframework.boot.devtools.restart.Restarter;
 import org.springframework.boot.env.EnvironmentPostProcessor;
 import org.springframework.core.Ordered;
@@ -28,7 +31,6 @@ import org.springframework.core.annotation.Order;
 import org.springframework.core.env.ConfigurableEnvironment;
 import org.springframework.core.env.Environment;
 import org.springframework.core.env.MapPropertySource;
-import org.springframework.core.env.PropertySource;
 
 /**
  * {@link EnvironmentPostProcessor} to add properties that make sense when working at
@@ -42,33 +44,40 @@ import org.springframework.core.env.PropertySource;
 @Order(Ordered.LOWEST_PRECEDENCE)
 public class DevToolsPropertyDefaultsPostProcessor implements EnvironmentPostProcessor {
 
+	private static final Log logger = DevToolsLogFactory
+			.getLog(DevToolsPropertyDefaultsPostProcessor.class);
+
+	private static final String ENABLED = "spring.devtools.add-properties";
+
 	private static final Map<String, Object> PROPERTIES;
 
 	static {
-		Map<String, Object> devToolsProperties = new HashMap<>();
-		devToolsProperties.put("spring.thymeleaf.cache", "false");
-		devToolsProperties.put("spring.freemarker.cache", "false");
-		devToolsProperties.put("spring.groovy.template.cache", "false");
-		devToolsProperties.put("spring.mustache.cache", "false");
-		devToolsProperties.put("server.servlet.session.persistent", "true");
-		devToolsProperties.put("spring.h2.console.enabled", "true");
-		devToolsProperties.put("spring.resources.cache.period", "0");
-		devToolsProperties.put("spring.resources.chain.cache", "false");
-		devToolsProperties.put("spring.template.provider.cache", "false");
-		devToolsProperties.put("spring.mvc.log-resolved-exception", "true");
-		devToolsProperties.put("server.error.include-stacktrace", "ALWAYS");
-		devToolsProperties.put("server.servlet.jsp.init-parameters.development", "true");
-		devToolsProperties.put("spring.reactor.stacktrace-mode.enabled", "true");
-		PROPERTIES = Collections.unmodifiableMap(devToolsProperties);
+		Map<String, Object> properties = new HashMap<>();
+		properties.put("spring.thymeleaf.cache", "false");
+		properties.put("spring.freemarker.cache", "false");
+		properties.put("spring.groovy.template.cache", "false");
+		properties.put("spring.mustache.cache", "false");
+		properties.put("server.servlet.session.persistent", "true");
+		properties.put("spring.h2.console.enabled", "true");
+		properties.put("spring.resources.cache.period", "0");
+		properties.put("spring.resources.chain.cache", "false");
+		properties.put("spring.template.provider.cache", "false");
+		properties.put("spring.mvc.log-resolved-exception", "true");
+		properties.put("server.error.include-stacktrace", "ALWAYS");
+		properties.put("server.servlet.jsp.init-parameters.development", "true");
+		properties.put("spring.reactor.stacktrace-mode.enabled", "true");
+		properties.put("logging.level.web", "debug");
+		PROPERTIES = Collections.unmodifiableMap(properties);
 	}
 
 	@Override
 	public void postProcessEnvironment(ConfigurableEnvironment environment,
 			SpringApplication application) {
 		if (isLocalApplication(environment) && canAddProperties(environment)) {
-			PropertySource<?> propertySource = new MapPropertySource("refresh",
-					PROPERTIES);
-			environment.getPropertySources().addLast(propertySource);
+			logger.info("Devtools property and logging defaults active! Set '" + ENABLED
+					+ "' to 'false' to disable");
+			environment.getPropertySources()
+					.addLast(new MapPropertySource("devtools", PROPERTIES));
 		}
 	}
 
@@ -77,7 +86,10 @@ public class DevToolsPropertyDefaultsPostProcessor implements EnvironmentPostPro
 	}
 
 	private boolean canAddProperties(Environment environment) {
-		return isRestarterInitialized() || isRemoteRestartEnabled(environment);
+		if (environment.getProperty(ENABLED, Boolean.class, true)) {
+			return isRestarterInitialized() || isRemoteRestartEnabled(environment);
+		}
+		return false;
 	}
 
 	private boolean isRestarterInitialized() {

spring-boot-project/spring-boot-devtools/src/main/resources/META-INF/additional-spring-configuration-metadata.json

@@ -19,6 +19,12 @@
         "reason": "Remote debug is no longer supported.",
         "level": "error"
       }
+    },
+    {
+      "name": "spring.devtools.add-properties",
+      "type": "java.lang.Boolean",
+      "description": "Whether to enable devtool property defaults.",
+      "defaultValue": true
     }
   ]
-}
+}

spring-boot-project/spring-boot-docs/src/main/asciidoc/using-spring-boot.adoc

@@ -783,6 +783,16 @@ For example, Thymeleaf offers the `spring.thymeleaf.cache` property. Rather than
 to set these properties manually, the `spring-boot-devtools` module automatically applies
 sensible development-time configuration.
 
+Because you need more information about web requests while developing Spring MVC and
+Spring WebFlux applications, developer tools will enable `DEBUG` logging for the `web`
+logging group. This will give you information about the incoming request, which handler is
+processing it, the response outcome, etc. If you wish to log all request details
+(including potentially sensitive information), you can turn on the
+`spring.http.log-request-details` configuration property.
+
+NOTE: If you don't want property defaults to be applied you can set
+`spring.devtools.add-properties` to `false` in your `application.properties`.
+
 TIP: For a complete list of the properties that are applied by the devtools, see
 {sc-spring-boot-devtools}/env/DevToolsPropertyDefaultsPostProcessor.{sc-ext}[DevToolsPropertyDefaultsPostProcessor].