Cleanup a few compiler warnings and improve some javadocs.

archaius2-api/src/main/java/com/netflix/archaius/api/Config.java

@@ -135,14 +135,26 @@ default boolean instrumentationEnabled() {
 
     /**
      * Get the property as a list.  Depending on the underlying implementation the list
-     * may be derived from a comma delimited string or from an actual list structure.
-     * @param key
-     * @return
+     * may be derived from a comma-delimited string or from an actual list structure.
+     * @deprecated Use {@link #getList(String, Class)} instead.
      */
     List<?> getList(String key);
-
+
+    /**
+     * Get the property as a list.  Depending on the underlying implementation the list
+     * may be derived from a comma-delimited string or from an actual list structure.
+     */
     <T> List<T> getList(String key, Class<T> type);
-
+
+    /**
+     * Get the property as a list.  Depending on the underlying implementation the list
+     * may be derived from a comma-delimited string or from an actual list structure.
+     * This method is inherently unsafe and should be used with caution. The type of the list may change
+     * depending on whether the key is defined or not, because the parser can't know the type of the defaultValue's
+     * elements.
+     * @deprecated Use {@link #getList(String, Class)} instead.
+     */
+    @Deprecated
     List<?> getList(String key, List<?> defaultValue);
 
     /**

archaius2-api/src/main/java/com/netflix/archaius/api/PropertyContainer.java

@@ -26,6 +26,7 @@
  * of Property are non-blocking and optimize updating property values 
  * in the background so as not to incur any overhead during hot call
  * paths.
+ * @deprecated Use {@link Property} instead.
  */
 @Deprecated
 public interface PropertyContainer {

archaius2-api/src/main/java/com/netflix/archaius/api/PropertyFactory.java

@@ -15,16 +15,20 @@
  */
 package com.netflix.archaius.api;
 
+import java.lang.reflect.Type;
+
 /**
  * Factory of Property objects.
  * 
  * @see Property
- * @deprecated Deprecated in favor of using PropertyRepository
+ * @deprecated Deprecated in favor of {@link PropertyRepository}
  */
 @Deprecated
 public interface PropertyFactory extends PropertyRepository {
     /**
-     * Create a property for the property name.  
+     * Create a property for the property name.
+     * @deprecated Use {@link PropertyRepository#get(String, Type)} instead.
      */
+    @Deprecated
     PropertyContainer getProperty(String propName);
 }

archaius2-commons-configuration/src/main/java/com/netflix/archaius/commons/CommonsToConfig.java

@@ -18,7 +18,6 @@
 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;
-import java.util.function.BiConsumer;
 
 import org.apache.commons.configuration.AbstractConfiguration;
 import org.apache.commons.lang.StringUtils;
@@ -59,16 +58,18 @@ public Iterator<String> getKeys() {
 
     @Override
     public <T> List<T> getList(String key, Class<T> type) {
-        List value = config.getList(key);
+        List<?> value = config.getList(key);
         if (value == null) {
             return notFound(key);
         }
-;
-        List<T> result = new ArrayList<T>();
+
+        List<T> result = new ArrayList<>();
         for (Object part : value) {
             if (type.isInstance(part)) {
-                result.add((T)part);
+                //noinspection unchecked
+                result.add((T) part);
             } else if (part instanceof String) {
+                //noinspection deprecation
                 result.add(getDecoder().decode(type, (String) part));
             } else {
                 throw new UnsupportedOperationException(
@@ -79,8 +80,8 @@ public <T> List<T> getList(String key, Class<T> type) {
     }
 
     @Override
-    public List getList(String key) {
-        List value = config.getList(key);
+    public List<?> getList(String key) {
+        List<?> value = config.getList(key);
         if (value == null) {
             return notFound(key);
         }
@@ -89,28 +90,24 @@ public List getList(String key) {
 
     @Override
     public String getString(String key, String defaultValue) {
-        List value = config.getList(key);
+        List<?> value = config.getList(key);
         if (value == null) {
             return notFound(key, defaultValue != null ? getStrInterpolator().create(getLookup()).resolve(defaultValue) : null);
         }
-        List<String> interpolatedResult = new ArrayList<>();
-        for (Object part : value) {
-            if (part instanceof String) {
-                interpolatedResult.add(getStrInterpolator().create(getLookup()).resolve(part.toString()));
-            } else {
-                throw new UnsupportedOperationException(
-                        "Property values other than String not supported");
-            }
-        }
-        return StringUtils.join(interpolatedResult, getListDelimiter());
+        return interpolateAndConcat(value);
     }
 
     @Override
     public String getString(String key) {
-        List value = config.getList(key);
+        List<?> value = config.getList(key);
         if (value == null) {
             return notFound(key);
         }
+        return interpolateAndConcat(value);
+    }
+
+
+    private String interpolateAndConcat(List<?> value) {
         List<String> interpolatedResult = new ArrayList<>();
         for (Object part : value) {
             if (part instanceof String) {