Add missing protected instance variable for BC.
@@ -19,6 +19,7 @@ package org.apache.log4j.helpers;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Objects;
+import java.util.Vector;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
@@ -33,6 +34,9 @@ public class AppenderAttachableImpl implements AppenderAttachable {
private final ConcurrentMap<String, Appender> appenders = new ConcurrentHashMap<>();
+ /** Array of appenders. TODO */
+ protected Vector appenderList;
+
@Override
public void addAppender(final Appender newAppender) {
if (newAppender != null) {
