Enhance ConfigLoggingBundle to log a minimized Dropwizard configuration (with constructor default values excluded).

liftwizard-logging/liftwizard-bundle-logging-config/pom.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-  ~ Copyright 2020 Craig Motlin
+  ~ Copyright 2024 Craig Motlin
   ~
   ~ Licensed under the Apache License, Version 2.0 (the "License");
   ~ you may not use this file except in compliance with the License.
@@ -62,6 +62,11 @@
             <artifactId>jackson-core</artifactId>
         </dependency>
 
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-annotations</artifactId>
+        </dependency>
+
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>

liftwizard-logging/liftwizard-bundle-logging-config/src/main/java/io/liftwizard/dropwizard/bundle/config/logging/ConfigLoggingBundle.java

@@ -75,8 +75,14 @@ private static void logConfiguration(
             @Nonnull ObjectMapper objectMapper)
             throws JsonProcessingException
     {
-        String configurationString = objectMapper.writeValueAsString(configuration);
-        LOGGER.info("Inferred Dropwizard configuration:\n{}", configurationString);
+        ObjectMapper nonDefaultObjectMapper = objectMapper.copy();
+        nonDefaultObjectMapper.setMixInResolver(new JsonIncludeNonDefaultMixInResolver());
+
+        String configurationString = nonDefaultObjectMapper.writeValueAsString(configuration);
+        LOGGER.info("Dropwizard configuration (minimized):\n{}", configurationString);
+
+        String fullConfigurationString = objectMapper.writeValueAsString(configuration);
+        LOGGER.debug("Dropwizard configuration (full):\n{}", fullConfigurationString);
 
         Optional<Object> maybeDefaultConfiguration = ConfigLoggingBundle
                 .getConstructor(configuration)
@@ -89,7 +95,7 @@ private static void logConfiguration(
         if (LOGGER.isDebugEnabled())
         {
             String defaultConfigurationString = objectMapper.writeValueAsString(defaultConfiguration);
-            LOGGER.debug("Default Dropwizard configuration:\n{}", defaultConfigurationString);
+            LOGGER.debug("Dropwizard configuration default values:\n{}", defaultConfigurationString);
         }
     }
 

liftwizard-logging/liftwizard-bundle-logging-config/src/main/java/io/liftwizard/dropwizard/bundle/config/logging/JsonIncludeNonDefaultMixIn.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2024 Craig Motlin
+ *
+ * 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 io.liftwizard.dropwizard.bundle.config.logging;
+
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonInclude.Include;
+
+@JsonInclude(Include.NON_DEFAULT)
+public class JsonIncludeNonDefaultMixIn
+{
+}

liftwizard-logging/liftwizard-bundle-logging-config/src/main/java/io/liftwizard/dropwizard/bundle/config/logging/JsonIncludeNonDefaultMixInResolver.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2024 Craig Motlin
+ *
+ * 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 io.liftwizard.dropwizard.bundle.config.logging;
+
+import com.fasterxml.jackson.databind.introspect.ClassIntrospector.MixInResolver;
+
+public class JsonIncludeNonDefaultMixInResolver
+        implements MixInResolver
+{
+    @Override
+    public Class<?> findMixInClassFor(Class<?> cls)
+    {
+        return JsonIncludeNonDefaultMixIn.class;
+    }
+
+    @Override
+    public MixInResolver copy()
+    {
+        return this;
+    }
+}