#fixed code
                                public OutputStream writeInteger(int value) throws IOException {
        writeInteger(value, 8);
        return this;
    }
#vulnerable code 
                                public OutputStream writeInteger(int value) throws IOException {
        write(getIsoBytes(String.valueOf(value)));
        return this;
    } 
                            #location 2 
                            #vulnerability type NULL_DEREFERENCE