src/java.base/share/classes/com/sun/java/util/jar/pack/ClassReader.java

*** 63,73 ****
      ClassReader(Class cls, InputStream in) throws IOException {
          this.pkg = cls.getPackage();
          this.cls = cls;
          this.verbose = pkg.verbose;
          this.in = new DataInputStream(new FilterInputStream(in) {
!             public int read(byte b[], int off, int len) throws IOException {
                  int nr = super.read(b, off, len);
                  if (nr >= 0)  inPos += nr;
                  return nr;
              }
              public int read() throws IOException {
--- 63,73 ----
      ClassReader(Class cls, InputStream in) throws IOException {
          this.pkg = cls.getPackage();
          this.cls = cls;
          this.verbose = pkg.verbose;
          this.in = new DataInputStream(new FilterInputStream(in) {
!             public int read(byte[] b, int off, int len) throws IOException {
                  int nr = super.read(b, off, len);
                  if (nr >= 0)  inPos += nr;
                  return nr;
              }
              public int read() throws IOException {