#vulnerable code 
                                public String body() {
        if (body == null) {
            if (servletRequest.getCharacterEncoding() != null) {
                try {
                    body = new String(bodyAsBytes(), servletRequest.getCharacterEncoding());
                } catch (UnsupportedEncodingException e) {
                    body = new String(bodyAsBytes());
                }
            } else {
                body = new String(bodyAsBytes());
            }
        }
        return body;
    } 
                            #location 7 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                public String body() {

        if (body == null) {
            body = StringUtils.toString(bodyAsBytes(), servletRequest.getCharacterEncoding());
        }

        return body;
    }