“NullPointerException”The number passed in the api is zzRefill is a null pointer.

[Cici-Musse-Lee]

The file path is org.zkoss.json.parser.Yylex.
In our test case, pass reader1=null into the function whose api is JSONParser0.parse(). Inside this api, the zzRefill function in Yylen will be called and a null pointer exception will be generated when it is called.
source code：

private boolean zzRefill() throws java.io.IOException{
        /*first:make room (if you can)*/
        if(zzStartRead＞0){
        System.arraycopy(zzBuffer,zzStartRead,
                                      zzBuffer,0,
                                      zzEndRead-zzStartRead);

            /*translate stored positions */
             zzEndRead-=zzStartRead;
             zzCurrentPos-=zzStartRead;
             zzMarkedPos-=zzStartRead;
             zzStartRead = 0;
    }

        /*is the buffer big enough?*/
        if (zzCurrentPos >zzBuffer.length){
             /*if not:blow it up */
             char newBuffer[]=new char[zzCurrentPos*2];
             System.arraycopy(zzBuffer,0,newBuffer,0,zzBuffer.length);
             zzBuffer = newBuffer;
     }
        /*finally:fill the buffer with new input */
        int numRead zzReader.read (zzBuffer,zzEndRead,zzBuffer.length-zzEndRead);

        if (numRead > 0){
             zzEndRead+=numRead;
             return false;
     }
}

test code：

    public void test_parse 3_18()throws java.io.IOException,org.zkoss.json.parser.ParseException,NoSuchField

        java.io.Reader reader1 = null;
        org.zkoss.json.parser.JSONParser JSONParser0 = new org.zkoss.]son.parser.JSONParser();
        JSONParser0.parse(reader1);