src/java.base/share/classes/java/io/FilterInputStream.java

*** 57,69 ****
       *
       * @param   in   the underlying input stream, or <code>null</code> if
       *          this instance is to be created without an underlying stream.
       */
      protected FilterInputStream(InputStream in) {
-         if (in == null) {
-             throw new NullPointerException();
-         }
          this.in = in;
      }
  
      /**
       * Reads the next byte of data from this input stream. The value
--- 57,66 ----