diff --git a/jetty-client/src/main/java/org/eclipse/jetty/client/LeakTrackingConnectionPool.java b/jetty-client/src/main/java/org/eclipse/jetty/client/LeakTrackingConnectionPool.java
index 4c1c3ef314b1..5ef4e22428e2 100644
--- a/jetty-client/src/main/java/org/eclipse/jetty/client/LeakTrackingConnectionPool.java
+++ b/jetty-client/src/main/java/org/eclipse/jetty/client/LeakTrackingConnectionPool.java
@@ -90,6 +90,6 @@ protected void released(Connection connection)
 
     protected void leaked(LeakDetector.LeakInfo leakInfo)
     {
-        LOG.info("Connection " + leakInfo.getResourceDescription() + " leaked at:", leakInfo.getStackFrames());
+        LOG.info("Connection {} leaked at:", leakInfo.getResourceDescription(), leakInfo.getStackFrames());
     }
 }
diff --git a/jetty-client/src/main/java/org/eclipse/jetty/client/RequestNotifier.java b/jetty-client/src/main/java/org/eclipse/jetty/client/RequestNotifier.java
index 805ca6b5b395..3bfe89e92a75 100644
--- a/jetty-client/src/main/java/org/eclipse/jetty/client/RequestNotifier.java
+++ b/jetty-client/src/main/java/org/eclipse/jetty/client/RequestNotifier.java
@@ -62,7 +62,7 @@ private void notifyQueued(Request.QueuedListener listener, Request request)
         }
         catch (Throwable x)
         {
-            LOG.info("Exception while notifying listener " + listener, x);
+            LOG.info("Exception while notifying listener {}", listener, x);
         }
     }
 
@@ -92,7 +92,7 @@ private void notifyBegin(Request.BeginListener listener, Request request)
         }
         catch (Throwable x)
         {
-            LOG.info("Exception while notifying listener " + listener, x);
+            LOG.info("Exception while notifying listener {}", listener, x);
         }
     }
 
@@ -122,7 +122,7 @@ private void notifyHeaders(Request.HeadersListener listener, Request request)
         }
         catch (Throwable x)
         {
-            LOG.info("Exception while notifying listener " + listener, x);
+            LOG.info("Exception while notifying listener {}", listener, x);
         }
     }
 
@@ -152,7 +152,7 @@ private void notifyCommit(Request.CommitListener listener, Request request)
         }
         catch (Throwable x)
         {
-            LOG.info("Exception while notifying listener " + listener, x);
+            LOG.info("Exception while notifying listener {}", listener, x);
         }
     }
 
@@ -194,7 +194,7 @@ private void notifyContent(Request.ContentListener listener, Request request, By
         }
         catch (Throwable x)
         {
-            LOG.info("Exception while notifying listener " + listener, x);
+            LOG.info("Exception while notifying listener {}", listener, x);
         }
     }
 
@@ -224,7 +224,7 @@ private void notifySuccess(Request.SuccessListener listener, Request request)
         }
         catch (Throwable x)
         {
-            LOG.info("Exception while notifying listener " + listener, x);
+            LOG.info("Exception while notifying listener {}", listener, x);
         }
     }
 
@@ -254,7 +254,7 @@ private void notifyFailure(Request.FailureListener listener, Request request, Th
         }
         catch (Throwable x)
         {
-            LOG.info("Exception while notifying listener " + listener, x);
+            LOG.info("Exception while notifying listener {}", listener, x);
         }
     }
 }
diff --git a/jetty-client/src/main/java/org/eclipse/jetty/client/ResponseNotifier.java b/jetty-client/src/main/java/org/eclipse/jetty/client/ResponseNotifier.java
index 1d3f959f10d1..bd3c78c21476 100644
--- a/jetty-client/src/main/java/org/eclipse/jetty/client/ResponseNotifier.java
+++ b/jetty-client/src/main/java/org/eclipse/jetty/client/ResponseNotifier.java
@@ -56,7 +56,7 @@ private void notifyBegin(Response.BeginListener listener, Response response)
         }
         catch (Throwable x)
         {
-            LOG.info("Exception while notifying listener " + listener, x);
+            LOG.info("Exception while notifying listener {}", listener, x);
         }
     }
 
@@ -79,7 +79,7 @@ private boolean notifyHeader(Response.HeaderListener listener, Response response
         }
         catch (Throwable x)
         {
-            LOG.info("Exception while notifying listener " + listener, x);
+            LOG.info("Exception while notifying listener {}", listener, x);
             return false;
         }
     }
@@ -101,7 +101,7 @@ private void notifyHeaders(Response.HeadersListener listener, Response response)
         }
         catch (Throwable x)
         {
-            LOG.info("Exception while notifying listener " + listener, x);
+            LOG.info("Exception while notifying listener {}", listener, x);
         }
     }
 
@@ -121,7 +121,7 @@ private void notifyBeforeContent(Response.DemandedContentListener listener, Resp
         }
         catch (Throwable x)
         {
-            LOG.info("Exception while notifying listener " + listener, x);
+            LOG.info("Exception while notifying listener {}", listener, x);
         }
     }
 
@@ -156,7 +156,7 @@ private void notifyContent(Response.DemandedContentListener listener, Response r
         }
         catch (Throwable x)
         {
-            LOG.info("Exception while notifying listener " + listener, x);
+            LOG.info("Exception while notifying listener {}", listener, x);
         }
     }
 
@@ -177,7 +177,7 @@ private void notifySuccess(Response.SuccessListener listener, Response response)
         }
         catch (Throwable x)
         {
-            LOG.info("Exception while notifying listener " + listener, x);
+            LOG.info("Exception while notifying listener {}", listener, x);
         }
     }
 
@@ -198,7 +198,7 @@ private void notifyFailure(Response.FailureListener listener, Response response,
         }
         catch (Throwable x)
         {
-            LOG.info("Exception while notifying listener " + listener, x);
+            LOG.info("Exception while notifying listener {}", listener, x);
         }
     }
 
@@ -219,7 +219,7 @@ private void notifyComplete(Response.CompleteListener listener, Result result)
         }
         catch (Throwable x)
         {
-            LOG.info("Exception while notifying listener " + listener, x);
+            LOG.info("Exception while notifying listener {}", listener, x);
         }
     }
 
diff --git a/jetty-http2/http2-client/src/main/java/org/eclipse/jetty/http2/client/HTTP2ClientSession.java b/jetty-http2/http2-client/src/main/java/org/eclipse/jetty/http2/client/HTTP2ClientSession.java
index e8a2b9197d45..d708fca63fbb 100644
--- a/jetty-http2/http2-client/src/main/java/org/eclipse/jetty/http2/client/HTTP2ClientSession.java
+++ b/jetty-http2/http2-client/src/main/java/org/eclipse/jetty/http2/client/HTTP2ClientSession.java
@@ -154,7 +154,7 @@ private Stream.Listener notifyPush(IStream stream, IStream pushStream, PushPromi
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
             return null;
         }
     }
diff --git a/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/HTTP2Session.java b/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/HTTP2Session.java
index 9169fd2cb0bb..4c065da0e048 100644
--- a/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/HTTP2Session.java
+++ b/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/HTTP2Session.java
@@ -1165,7 +1165,7 @@ protected Stream.Listener notifyNewStream(Stream stream, HeadersFrame frame)
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
             return null;
         }
     }
@@ -1178,7 +1178,7 @@ protected void notifySettings(Session session, SettingsFrame frame)
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
         }
     }
 
@@ -1190,7 +1190,7 @@ protected void notifyPing(Session session, PingFrame frame)
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
         }
     }
 
@@ -1202,7 +1202,7 @@ protected void notifyReset(Session session, ResetFrame frame)
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
         }
     }
 
@@ -1214,7 +1214,7 @@ protected void notifyClose(Session session, GoAwayFrame frame, Callback callback
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
         }
     }
 
@@ -1226,7 +1226,7 @@ protected boolean notifyIdleTimeout(Session session)
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
             return true;
         }
     }
@@ -1239,7 +1239,7 @@ protected void notifyFailure(Session session, Throwable failure, Callback callba
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
         }
     }
 
@@ -1254,7 +1254,7 @@ protected void notifyHeaders(IStream stream, HeadersFrame frame)
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
         }
     }
 
diff --git a/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/HTTP2Stream.java b/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/HTTP2Stream.java
index d31d716d66ef..b25b3cfdc4bc 100644
--- a/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/HTTP2Stream.java
+++ b/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/HTTP2Stream.java
@@ -708,7 +708,7 @@ private void notifyNewStream(Stream stream)
             }
             catch (Throwable x)
             {
-                LOG.info("Failure while notifying listener " + listener, x);
+                LOG.info("Failure while notifying listener {}", listener, x);
             }
         }
     }
@@ -724,7 +724,7 @@ private void notifyBeforeData(Stream stream)
             }
             catch (Throwable x)
             {
-                LOG.info("Failure while notifying listener " + listener, x);
+                LOG.info("Failure while notifying listener {}", listener, x);
             }
         }
         else
@@ -744,7 +744,7 @@ private void notifyDataDemanded(Stream stream, DataFrame frame, Callback callbac
             }
             catch (Throwable x)
             {
-                LOG.info("Failure while notifying listener " + listener, x);
+                LOG.info("Failure while notifying listener {}", listener, x);
                 callback.failed(x);
             }
         }
@@ -766,7 +766,7 @@ private void notifyReset(Stream stream, ResetFrame frame, Callback callback)
             }
             catch (Throwable x)
             {
-                LOG.info("Failure while notifying listener " + listener, x);
+                LOG.info("Failure while notifying listener {}", listener, x);
                 callback.failed(x);
             }
         }
@@ -787,7 +787,7 @@ private boolean notifyIdleTimeout(Stream stream, Throwable failure)
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
             return true;
         }
     }
@@ -803,7 +803,7 @@ private void notifyFailure(Stream stream, FailureFrame frame, Callback callback)
             }
             catch (Throwable x)
             {
-                LOG.info("Failure while notifying listener " + listener, x);
+                LOG.info("Failure while notifying listener {}", listener, x);
                 callback.failed(x);
             }
         }
@@ -824,7 +824,7 @@ private void notifyClosed(Stream stream)
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
         }
     }
 
diff --git a/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/parser/BodyParser.java b/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/parser/BodyParser.java
index 2c06fd20e90e..7b3b41d59640 100644
--- a/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/parser/BodyParser.java
+++ b/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/parser/BodyParser.java
@@ -109,7 +109,7 @@ protected void notifyData(DataFrame frame)
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
         }
     }
 
@@ -121,7 +121,7 @@ protected void notifyHeaders(HeadersFrame frame)
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
         }
     }
 
@@ -133,7 +133,7 @@ protected void notifyPriority(PriorityFrame frame)
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
         }
     }
 
@@ -145,7 +145,7 @@ protected void notifyReset(ResetFrame frame)
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
         }
     }
 
@@ -157,7 +157,7 @@ protected void notifySettings(SettingsFrame frame)
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
         }
     }
 
@@ -169,7 +169,7 @@ protected void notifyPushPromise(PushPromiseFrame frame)
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
         }
     }
 
@@ -181,7 +181,7 @@ protected void notifyPing(PingFrame frame)
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
         }
     }
 
@@ -193,7 +193,7 @@ protected void notifyGoAway(GoAwayFrame frame)
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
         }
     }
 
@@ -205,7 +205,7 @@ protected void notifyWindowUpdate(WindowUpdateFrame frame)
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
         }
     }
 
@@ -224,7 +224,7 @@ private void notifyConnectionFailure(int error, String reason)
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
         }
     }
 
@@ -242,7 +242,7 @@ private void notifyStreamFailure(int streamId, int error, String reason)
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
         }
     }
 
diff --git a/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/parser/Parser.java b/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/parser/Parser.java
index a04c81c42b71..371dfb3c6df5 100644
--- a/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/parser/Parser.java
+++ b/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/parser/Parser.java
@@ -247,7 +247,7 @@ protected void notifyConnectionFailure(int error, String reason)
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
         }
     }
 
diff --git a/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/parser/PrefaceParser.java b/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/parser/PrefaceParser.java
index 0dc6a052d3d0..ea38a7fb1c72 100644
--- a/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/parser/PrefaceParser.java
+++ b/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/parser/PrefaceParser.java
@@ -82,7 +82,7 @@ protected void notifyConnectionFailure(int error, String reason)
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
         }
     }
 }
diff --git a/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/parser/ServerParser.java b/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/parser/ServerParser.java
index 21aaf5aa6cde..a18835c98fe3 100644
--- a/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/parser/ServerParser.java
+++ b/jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/parser/ServerParser.java
@@ -143,7 +143,7 @@ private void notifyPreface()
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
         }
     }
 
diff --git a/jetty-http2/http2-server/src/main/java/org/eclipse/jetty/http2/server/HTTP2ServerConnection.java b/jetty-http2/http2-server/src/main/java/org/eclipse/jetty/http2/server/HTTP2ServerConnection.java
index 9bcf82d4bd0c..d5a6d24ab380 100644
--- a/jetty-http2/http2-server/src/main/java/org/eclipse/jetty/http2/server/HTTP2ServerConnection.java
+++ b/jetty-http2/http2-server/src/main/java/org/eclipse/jetty/http2/server/HTTP2ServerConnection.java
@@ -151,7 +151,7 @@ private void notifyAccept(ISession session)
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
         }
     }
 
diff --git a/jetty-http2/http2-server/src/main/java/org/eclipse/jetty/http2/server/HTTP2ServerSession.java b/jetty-http2/http2-server/src/main/java/org/eclipse/jetty/http2/server/HTTP2ServerSession.java
index 3f91042fd305..2385500dc71f 100644
--- a/jetty-http2/http2-server/src/main/java/org/eclipse/jetty/http2/server/HTTP2ServerSession.java
+++ b/jetty-http2/http2-server/src/main/java/org/eclipse/jetty/http2/server/HTTP2ServerSession.java
@@ -172,7 +172,7 @@ private Map<Integer, Integer> notifyPreface(Session session)
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
             return null;
         }
     }
diff --git a/jetty-io/src/main/java/org/eclipse/jetty/io/AbstractConnection.java b/jetty-io/src/main/java/org/eclipse/jetty/io/AbstractConnection.java
index bc07b02f145b..f49cc8cfaff6 100644
--- a/jetty-io/src/main/java/org/eclipse/jetty/io/AbstractConnection.java
+++ b/jetty-io/src/main/java/org/eclipse/jetty/io/AbstractConnection.java
@@ -220,7 +220,7 @@ private void onOpened(Listener listener)
         }
         catch (Throwable x)
         {
-            LOG.info("Failure while notifying listener " + listener, x);
+            LOG.info("Failure while notifying listener {}", listener, x);
         }
     }
 
diff --git a/jetty-io/src/main/java/org/eclipse/jetty/io/NetworkTrafficSocketChannelEndPoint.java b/jetty-io/src/main/java/org/eclipse/jetty/io/NetworkTrafficSocketChannelEndPoint.java
index 272c0ecc0aca..97dd06bda8b5 100644
--- a/jetty-io/src/main/java/org/eclipse/jetty/io/NetworkTrafficSocketChannelEndPoint.java
+++ b/jetty-io/src/main/java/org/eclipse/jetty/io/NetworkTrafficSocketChannelEndPoint.java
@@ -84,7 +84,7 @@ public void onOpen()
             }
             catch (Throwable x)
             {
-                LOG.info("Exception while invoking listener " + listener, x);
+                LOG.info("Exception while invoking listener {}", listener, x);
             }
         }
     }
@@ -101,7 +101,7 @@ public void onClose(Throwable failure)
             }
             catch (Throwable x)
             {
-                LOG.info("Exception while invoking listener " + listener, x);
+                LOG.info("Exception while invoking listener {}", listener, x);
             }
         }
     }
@@ -117,7 +117,7 @@ public void notifyIncoming(ByteBuffer buffer, int read)
             }
             catch (Throwable x)
             {
-                LOG.info("Exception while invoking listener " + listener, x);
+                LOG.info("Exception while invoking listener {}", listener, x);
             }
         }
     }
@@ -132,7 +132,7 @@ public void notifyOutgoing(ByteBuffer view)
             }
             catch (Throwable x)
             {
-                LOG.info("Exception while invoking listener " + listener, x);
+                LOG.info("Exception while invoking listener {}", listener, x);
             }
         }
     }
diff --git a/jetty-io/src/main/java/org/eclipse/jetty/io/ssl/SslConnection.java b/jetty-io/src/main/java/org/eclipse/jetty/io/ssl/SslConnection.java
index b0768c7fddb0..e38c55ba7ab5 100644
--- a/jetty-io/src/main/java/org/eclipse/jetty/io/ssl/SslConnection.java
+++ b/jetty-io/src/main/java/org/eclipse/jetty/io/ssl/SslConnection.java
@@ -1394,7 +1394,7 @@ private void notifyHandshakeSucceeded(SSLEngine sslEngine) throws SSLException
                 }
                 catch (Throwable x)
                 {
-                    LOG.info("Exception while notifying listener " + listener, x);
+                    LOG.info("Exception while notifying listener {}", listener, x);
                 }
             }
         }
@@ -1412,7 +1412,7 @@ private void notifyHandshakeFailed(SSLEngine sslEngine, Throwable failure)
                 }
                 catch (Throwable x)
                 {
-                    LOG.info("Exception while notifying listener " + listener, x);
+                    LOG.info("Exception while notifying listener {}", listener, x);
                 }
             }
         }
diff --git a/jetty-util/src/main/java/org/eclipse/jetty/util/thread/Sweeper.java b/jetty-util/src/main/java/org/eclipse/jetty/util/thread/Sweeper.java
index 74fb5394ea1d..d825f95f3e08 100644
--- a/jetty-util/src/main/java/org/eclipse/jetty/util/thread/Sweeper.java
+++ b/jetty-util/src/main/java/org/eclipse/jetty/util/thread/Sweeper.java
@@ -143,7 +143,7 @@ public void run()
             }
             catch (Throwable x)
             {
-                LOG.info("Exception while sweeping " + sweepable, x);
+                LOG.info("Exception while sweeping {}", sweepable, x);
             }
         }
         activate();
diff --git a/jetty-websocket/websocket-javax-common/src/main/java/org/eclipse/jetty/websocket/javax/common/JavaxWebSocketContainer.java b/jetty-websocket/websocket-javax-common/src/main/java/org/eclipse/jetty/websocket/javax/common/JavaxWebSocketContainer.java
index 57a7548e078e..8ae9a48b1b10 100644
--- a/jetty-websocket/websocket-javax-common/src/main/java/org/eclipse/jetty/websocket/javax/common/JavaxWebSocketContainer.java
+++ b/jetty-websocket/websocket-javax-common/src/main/java/org/eclipse/jetty/websocket/javax/common/JavaxWebSocketContainer.java
@@ -194,7 +194,7 @@ public void notifySessionListeners(Consumer<JavaxWebSocketSessionListener> consu
             }
             catch (Throwable x)
             {
-                LOG.info("Exception while invoking listener " + listener, x);
+                LOG.info("Exception while invoking listener {}", listener, x);
             }
         }
     }
diff --git a/jetty-websocket/websocket-jetty-client/src/main/java/org/eclipse/jetty/websocket/client/WebSocketClient.java b/jetty-websocket/websocket-jetty-client/src/main/java/org/eclipse/jetty/websocket/client/WebSocketClient.java
index 9abdbbed8af8..4d686a92eb14 100644
--- a/jetty-websocket/websocket-jetty-client/src/main/java/org/eclipse/jetty/websocket/client/WebSocketClient.java
+++ b/jetty-websocket/websocket-jetty-client/src/main/java/org/eclipse/jetty/websocket/client/WebSocketClient.java
@@ -212,7 +212,7 @@ public void notifySessionListeners(Consumer<WebSocketSessionListener> consumer)
             }
             catch (Throwable x)
             {
-                LOG.info("Exception while invoking listener " + listener, x);
+                LOG.info("Exception while invoking listener {}", listener, x);
             }
         }
     }
diff --git a/jetty-websocket/websocket-jetty-server/src/main/java/org/eclipse/jetty/websocket/server/JettyWebSocketServerContainer.java b/jetty-websocket/websocket-jetty-server/src/main/java/org/eclipse/jetty/websocket/server/JettyWebSocketServerContainer.java
index 9609ba815ccc..78128a7a4bca 100644
--- a/jetty-websocket/websocket-jetty-server/src/main/java/org/eclipse/jetty/websocket/server/JettyWebSocketServerContainer.java
+++ b/jetty-websocket/websocket-jetty-server/src/main/java/org/eclipse/jetty/websocket/server/JettyWebSocketServerContainer.java
@@ -184,7 +184,7 @@ public void notifySessionListeners(Consumer<WebSocketSessionListener> consumer)
             }
             catch (Throwable x)
             {
-                LOG.info("Exception while invoking listener " + listener, x);
+                LOG.info("Exception while invoking listener {}", listener, x);
             }
         }
     }