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

*** 423,433 ****
              super(evt, evt.requestID);
              this.classSignature = evt.signature;
          }
  
          public String className() {
!             String name = classSignature;
              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>
--- 423,433 ----
              super(evt, evt.requestID);
              this.classSignature = evt.signature;
          }
  
          public String className() {
!             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>