Fix ConcurrentModificationException when iterating through conne… (#922)

Fix ConcurrentModificationException when iterating through connection…
TooTallNate · Aug 12, 2019 · 8fcd4d1 · 8fcd4d1
2 parents dc080e0 + fc30bf2
commit 8fcd4d1
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/main/java/org/java_websocket/server/WebSocketServer.java b/src/main/java/org/java_websocket/server/WebSocketServer.java
@@ -279,7 +279,9 @@ public void stop() throws IOException , InterruptedException {
 	 * @since 1.3.8
 	 */
 	public Collection<WebSocket> getConnections() {
-		return Collections.unmodifiableCollection( new ArrayList<WebSocket>(connections) );
+		synchronized (connections) {
+			return Collections.unmodifiableCollection( new ArrayList<WebSocket>(connections) );
+		}
 	}
 
 	public InetSocketAddress getAddress() {