Bean Validation - New Article

Modify Article.java as shown below.

Article.java
private Integer articleNo;//Change int to Integer

@Size(min=2,max=10,message="The board code must be between 2 and 10 characters.")
private String boardCd;

@Size(min=1,max=60,message="The title must consist of 1 to 100 characters.")
private String title;

@Size(min=1,message="The content must consist of 2 characters.")
private String content;

//omit..

public Integer getArticleNo() {
    return articleNo;
}

public void setArticleNo(Integer articleNo) {
    this.articleNo = articleNo;
}
BbsController.java
@RequestMapping(value="/write", method=RequestMethod.GET)
public String writeForm(String boardCd, Model model) {
    String boardNm = boardService.getBoardNm(boardCd);
    model.addAttribute("boardNm", boardNm);
    model.addAttribute("article", new Article());
    return "bbs/write";
}

@RequestMapping(value="/write", method=RequestMethod.POST)
public String write(@Valid Article article, BindingResult bindingResult,
        Model model,
        MultipartHttpServletRequest mpRequest,
        Principal principal) throws Exception {
        
    if (bindingResult.hasErrors()) {
        String boardNm = boardService.getBoardNm(article.getBoardCd());
        model.addAttribute("boardNm", boardNm);
        return "bbs/write";
    }
    
    article.setEmail(principal.getName());
    boardService.addArticle(article);

    //..omit..

    return "redirect:/bbs/list?page=1&boardCd=" + article.getBoardCd();
}
write.jsp
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="sf" %>

<sf:form id="writeForm" action="write" method="post" enctype="multipart/form-data" 
        modelAttribute="article" onsubmit="return check();">
    <input type="hidden" name="articleNo" value="${param.articleNo }" />
    <input type="hidden" name="boardCd" value="${param.boardCd }" />
    <input type="hidden" name="page" value="${param.page }" />
    <input type="hidden" name="searchWord" value="${param.searchWord }" />
<sf:errors path="*" cssClass="error" />
<table id="write-form">
<tr>
    <td>Title</td>
    <td>
        <sf:input path="title" style="width: 90%" /><br />
        <sf:errors path="title" cssClass="error" />
    </td>
</tr>
<tr>
    <td colspan="2">
        <textarea name="content" rows="17" cols="50"></textarea><br />
        <sf:errors path="content" cssClass="error" />
    </td>
</tr>
<tr>
    <td>Attach File</td>
    <td><input type="file" name="attachFile" /></td>
</tr>
</table>
<div style="text-align: center; padding-bottom: 15px;">
    <input type="submit" value="Submit" />
    <input type="button" value="List" onclick="goList()" />
    <c:if test="${not empty param.articleNo }">
        <input type="button" value="Detailed view" onclick="goView()" />
    </c:if>
</div>
</sf:form>

On the post screen, click the Submit button without entering anything.
New article test 1
New article test 2

References