src/java.base/share/classes/java/net/URLClassLoader.java

*** 50,59 ****
--- 50,60 ----
  import java.util.jar.JarFile;
  import java.util.jar.Manifest;
  
  import jdk.internal.misc.JavaNetAccess;
  import jdk.internal.misc.SharedSecrets;
+ import jdk.internal.perf.PerfCounter;
  import sun.misc.Resource;
  import sun.misc.URLClassPath;
  import sun.net.www.ParseUtil;
  import sun.security.util.SecurityConstants;
  
*** 457,474 ****
          java.nio.ByteBuffer bb = res.getByteBuffer();
          if (bb != null) {
              // Use (direct) ByteBuffer:
              CodeSigner[] signers = res.getCodeSigners();
              CodeSource cs = new CodeSource(url, signers);
!             sun.misc.PerfCounter.getReadClassBytesTime().addElapsedTimeFrom(t0);
              return defineClass(name, bb, cs);
          } else {
              byte[] b = res.getBytes();
              // must read certificates AFTER reading bytes.
              CodeSigner[] signers = res.getCodeSigners();
              CodeSource cs = new CodeSource(url, signers);
!             sun.misc.PerfCounter.getReadClassBytesTime().addElapsedTimeFrom(t0);
              return defineClass(name, b, 0, b.length, cs);
          }
      }
  
      /**
--- 458,475 ----
          java.nio.ByteBuffer bb = res.getByteBuffer();
          if (bb != null) {
              // Use (direct) ByteBuffer:
              CodeSigner[] signers = res.getCodeSigners();
              CodeSource cs = new CodeSource(url, signers);
!             PerfCounter.getReadClassBytesTime().addElapsedTimeFrom(t0);
              return defineClass(name, bb, cs);
          } else {
              byte[] b = res.getBytes();
              // must read certificates AFTER reading bytes.
              CodeSigner[] signers = res.getCodeSigners();
              CodeSource cs = new CodeSource(url, signers);
!             PerfCounter.getReadClassBytesTime().addElapsedTimeFrom(t0);
              return defineClass(name, b, 0, b.length, cs);
          }
      }
  
      /**