sunchao commented on a change in pull request #2341:
URL: https://github.com/apache/hadoop/pull/2341#discussion_r496095888
##########
File path:
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/ReflectionUtils.java
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@@ -124,15 +124,29 @@ private static void setJobConf(Object theObject,
Configuration conf) {
*/
@SuppressWarnings("unchecked")
public static <T> T newInstance(Class<T> theClass, Configuration conf) {
+ return newInstance(theClass, conf, EMPTY_ARRAY);
+ }
+
+ /** Create an object for the given class and initialize it from conf
+ *
+ * @param theClass class of which an object is created
+ * @param conf Configuration
+ * @param argTypes the types of the arguments
+ * @param values the values of the arguments
+ * @return a new object
+ */
+ @SuppressWarnings("unchecked")
+ public static <T> T newInstance(Class<T> theClass, Configuration conf,
+ Class<?>[] argTypes, Object ... values) {
Review comment:
One more thing we can do here is perhaps checking whether
`argTypes.length == values.length`, and throw `IllegalArgumentException` like:
"1 parameters are required but 0 arguments are provided". This will be more
informative than the default exception message.
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