Use of default value for for properties using the Key Expansion mechanism

owner/src/main/java/org/aeonbits/owner/PropertiesInvocationHandler.java

@@ -80,6 +80,10 @@ private boolean equals(Method a, Method b) {
     private Object resolveProperty(Method method, Object... args) {
         String key = expandKey(method);
         String value = propertiesManager.getProperty(key);
+        if (value == null && !isFeatureDisabled(method, VARIABLE_EXPANSION)) {
+            String unexpandedKey = key(method);
+            value = propertiesManager.getProperty(unexpandedKey);
+        }
         if (value == null)
             return null;
         Object result = convert(method, method.getReturnType(), format(method, expandVariables(method, value), args));

owner/src/test/java/org/aeonbits/owner/variableexpansion/KeyExpansionTest.java

@@ -131,4 +131,23 @@ public void testKeyExpansionFromAnotherKeyWithImportOverriding() {
         assertNull("mypass2", cfg.password()); // expansion is disabled on method level
     }
 
+    @Sources("classpath:org/aeonbits/owner/variableexpansion/KeyExpansionExample.xml")
+    public interface UseOfDefaultValueIfNotFound extends Config {
+
+        @DefaultValue("dev")
+        String env();
+
+        @Config.Key("servers.${env}.nonDefinedInSourceKey")
+        @Config.DefaultValue("wantedValue")
+        String undefinedPropInSource();
+
+    }
+
+    @Test
+    public void testKeyExpansionAndDefaultValue() {
+        UseOfDefaultValueIfNotFound cfg = ConfigFactory.create(UseOfDefaultValueIfNotFound.class);
+
+        assertEquals("dev", cfg.env());
+        assertEquals("wantedValue", cfg.undefinedPropInSource());
+    }
 }