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

*** 87,96 ****
--- 87,99 ----
       * @exception IllegalArgumentException if {@code size <= 0}
       * @since  1.1
       */
      public PushbackInputStream(InputStream in, int size) {
          super(in);
+         if (in == null) {
+             throw new NullPointerException();
+         } 
          if (size <= 0) {
              throw new IllegalArgumentException("size <= 0");
          }
          this.buf = new byte[size];
          this.pos = size;