diff --git a/jetty-jndi/src/main/java/org/eclipse/jetty/jndi/ContextFactory.java b/jetty-jndi/src/main/java/org/eclipse/jetty/jndi/ContextFactory.java
index 2dd88a89c85..498e1f5853a 100644
--- a/jetty-jndi/src/main/java/org/eclipse/jetty/jndi/ContextFactory.java
+++ b/jetty-jndi/src/main/java/org/eclipse/jetty/jndi/ContextFactory.java
@@ -259,7 +259,7 @@ public class ContextFactory implements ObjectFactory
     {
         synchronized (__contextMap)
         {
-            Dumpable.dumpObjects(out, indent, String.format("o.e.j.jndi.ContextFactory@", __contextMap.hashCode()), __contextMap);
+            Dumpable.dumpObjects(out, indent, String.format("o.e.j.jndi.ContextFactory@%x", __contextMap.hashCode()), __contextMap);
         }
     }
 }
diff --git a/pom.xml b/pom.xml
index b4894db16ef..8cc78b4e2f1 100644
--- a/pom.xml
+++ b/pom.xml
@@ -591,7 +591,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-pmd-plugin</artifactId>
-          <version>3.11.0</version>
+          <version>3.13.0</version>
         </plugin>
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>