src/jdk.jdi/share/classes/com/sun/tools/jdi/EventSetImpl.java

@@ -423,11 +423,11 @@
             super(evt, evt.requestID);
             this.classSignature = evt.signature;
         }
 
         public String className() {
-            String name = classSignature;
+            String name = classSignature.substring(1, classSignature.length() - 1);
             int index = name.indexOf(".");  // check if it's a hidden class
             if (index < 0) {
                 name = name.replace('/', '.');
             } else {
                 // the class name of a hidden class is <binary-name> + "/" + <suffix>