If a bean sees foo-bar and fooBar, prefer camel name

config/src/main/java/com/typesafe/config/impl/ConfigBeanImpl.java

@@ -33,9 +33,17 @@ public class ConfigBeanImpl {
         Map<String, AbstractConfigValue> configProps = new HashMap<String, AbstractConfigValue>();
         Map<String, String> originalNames = new HashMap<String, String>();
         for (Map.Entry<String, ConfigValue> configProp : config.root().entrySet()) {
-            String camelName = ConfigImplUtil.toCamelCase(configProp.getKey());
-            configProps.put(camelName, (AbstractConfigValue) configProp.getValue());
-            originalNames.put(camelName, configProp.getKey());
+            String originalName = configProp.getKey();
+            String camelName = ConfigImplUtil.toCamelCase(originalName);
+            // if a setting is in there both as some hyphen name and the camel name,
+            // the camel one wins
+            if (originalNames.containsKey(camelName) && originalName != camelName) {
+                // if we aren't a camel name to start with, we lose.
+                // if we are or we are the first matching key, we win.
+            } else {
+                configProps.put(camelName, (AbstractConfigValue) configProp.getValue());
+                originalNames.put(camelName, originalName);
+            }
         }
 
         BeanInfo beanInfo = null;

config/src/test/java/beanconfig/PreferCamelNamesConfig.java

@@ -0,0 +1,22 @@
+package beanconfig;
+
+
+public class PreferCamelNamesConfig {
+
+
+    private String fooBar;
+    private String bazBar;
+
+    public String getFooBar() {
+        return fooBar;
+    }
+    public void setFooBar(String v) {
+        this.fooBar = v;
+    }
+    public String getBazBar() {
+        return bazBar;
+    }
+    public void setBazBar(String v) {
+        this.bazBar = v;
+    }
+}

config/src/test/resources/beanconfig/beanconfig01.conf

@@ -62,5 +62,11 @@
       "shouldBeInt" : true,
       "should-be-boolean" : 42,
       "should-be-list" : "hello"
+    },
+    "preferCamelNames" : {
+      "foo-bar" : "no",
+      "fooBar" : "yes",
+      "baz-bar" : "no",
+      "bazBar" : "yes"
     }
 }

config/src/test/scala/com/typesafe/config/impl/ConfigBeanFactoryTest.scala

@@ -118,6 +118,15 @@ class ConfigBeanFactoryTest extends TestUtils {
         assertEquals(ConfigMemorySize.ofBytes(1000), beanConfig.getThousandBytes)
     }
 
+    @Test
+    def testPreferCamelNames() {
+        val beanConfig = ConfigBeanFactory.create(loadConfig().getConfig("preferCamelNames"), classOf[PreferCamelNamesConfig])
+        assertNotNull(beanConfig)
+
+        assertEquals("yes", beanConfig.getFooBar)
+        assertEquals("yes", beanConfig.getBazBar)
+    }
+
     private def loadConfig(): Config = {
         val configIs: InputStream = this.getClass().getClassLoader().getResourceAsStream("beanconfig/beanconfig01.conf")
         try {