diff --git a/jetty-ee9/jetty-ee9-webapp/src/test/java/org/eclipse/jetty/ee9/webapp/ClassMatcherTest.java b/jetty-ee9/jetty-ee9-webapp/src/test/java/org/eclipse/jetty/ee9/webapp/ClassMatcherTest.java
index 7a2af34c4a5..a0891442f9b 100644
--- a/jetty-ee9/jetty-ee9-webapp/src/test/java/org/eclipse/jetty/ee9/webapp/ClassMatcherTest.java
+++ b/jetty-ee9/jetty-ee9-webapp/src/test/java/org/eclipse/jetty/ee9/webapp/ClassMatcherTest.java
@@ -30,6 +30,7 @@ import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.is;
 import static org.hamcrest.Matchers.notNullValue;
 import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
 public class ClassMatcherTest
@@ -212,15 +213,15 @@ public class ClassMatcherTest
     {
         // jar from JVM classloader
         URI modString = TypeUtil.getLocationOfClass(String.class);
-        // System.err.println(modString);
+        assertNotNull(modString);
 
         // a jar from maven repo jar
         URI locJunit = TypeUtil.getLocationOfClass(Test.class);
-        // System.err.println(locJunit);
+        assertNotNull(locJunit);
 
         // class file
         URI locTest = TypeUtil.getLocationOfClass(ClassMatcherTest.class);
-        // System.err.println(locTest);
+        assertNotNull(locTest);
 
         ClassMatcher pattern = new ClassMatcher();
 
@@ -235,7 +236,7 @@ public class ClassMatcherTest
         pattern.exclude("jrt:/java.base/");
 
         // Add jar for individual class and classes directory
-        pattern.exclude(locJunit.toString(), locTest.toString());
+        pattern.exclude(locJunit.toASCIIString(), locTest.toASCIIString());
 
         assertThat(pattern.match(String.class), is(false));
         assertThat(pattern.match(Test.class), is(false));