Question

我在春季3有弹簧数据（jpa）。当我尝试从产品的db详细信息加载时，服务器会给出消息：HTTP Status 500 - 服务器遇到内部错误，导致无法完成此请求。我可以在db中写入数据（没问题）并显示所有产品但不能显示详细信息。我不知道发生了什么（我尝试在tomcat 7.042和VMware v 2.9上同样的结果）。这是我的代码：实体：

@Entity
@Table(name="product")
@NamedQuery(name="Product.findAll", query="SELECT p FROM Product p")
public class Product implements Serializable {
private static final long serialVersionUID = 1L;

@Id
public Long id;

private String author;

@Lob
private byte[] cover;

private String description;

private float price;

private String title;

private String year;

public Product() {
}

public Long getId() {
    return this.id;
}

public void setId(Long id) {
    this.id = id;
}

public String getAuthor() {
    return this.author;
}

public void setAuthor(String author) {
    this.author = author;
}

public byte[] getCover() {
    return this.cover;
}

public void setCover(byte[] cover) {
    this.cover = cover;
}

public String getDescription() {
    return this.description;
}

public void setDescription(String description) {
    this.description = description;
}

public float getPrice() {
    return this.price;
}

public void setPrice(float price) {
    this.price = price;
}

public String getTitle() {
    return this.title;
}

public void setTitle(String title) {
    this.title = title;
}

public String getYear() {
    return this.year;
}

public void setYear(String year) {
    this.year = year;
}

}

存储库接口：

public interface ProductRepository extends JpaRepository<Product,      Long>,PagingAndSortingRepository<Product, Long> {
@Query("SELECT p FROM Product p")
public Page<Product> takeAll( Pageable pageable);
@Query("select p from Product p where p.id = ?1")
public Product takeByTitle( Long id);

   }

DAO：

@Service
@Transactional
public class ProductDAO {
@Autowired
ProductRepository productRepository;

public Page<Product> showAllProducts(Pageable pageable){
return productRepository.takeAll(pageable);
}

public Product searchByDetails(Long id){
 return productRepository.takeByTitle(id);
}
}

端点：

@Component
@Transactional
public class ProductEndpoint {

@Autowired
ProductDAO productDAO;
public Page<Product> getAll(Pageable pageable){
return productDAO.showAllProducts(pageable);
}
public Product TakeDetails(Long id){
 return productDAO.searchByDetails(id);
}
}

控制器：

@Controller
@RequestMapping("/index")
public class IndexController {

@Autowired
ProductEndpoint productEndpoint;
  @RequestMapping(method = RequestMethod.GET)
 public String showHome(Model model, Pageable pageable){
Page<Product> product = productEndpoint.getAll(pageable);
model.addAttribute("product", product.getContent());
model.addAttribute("page", product.getTotalPages());
model.addAttribute("pageNumber", product.getNumber());
return "index";
 }

 @RequestMapping(value = "/{id}", method = RequestMethod.GET)
 public String showById(@RequestParam(value = "id")Long id, Model model){
model.addAttribute("product", productEndpoint.TakeDetails(id));
return "details";
 }
 }

  @Controller
  public class DetailsController {
@Autowired
ProductEndpoint productEndpoint;
@RequestMapping(value = "{id}", method = RequestMethod.GET)
public String showDetails(@PathVariable("id") Model model){
    model.addAttribute("product");
    return "details";
}

@RequestMapping(value = "/details/addtocart", method = RequestMethod.POST)
public String addToCart(){
return "redirect:/cart";
}
}

和index.html：

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
 <meta charset="utf-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
<title></title>
<meta name="description" content="HTML 5 CSS 3 Spring Form"/>
<meta name="viewport" content="width=device-width,initial-scale=1"/>
<script src="../../js/libs/ajax.js" th:src="@{/js/libs/ajax.js}"></script>
</head>
<body>
<div id="container" align="center">
  <form method="post">
<table border="1">
<tr>
  <td>#</td>
<td></td>
<td align="center"><b>TITLE</b></td>
<td ><b>PRICE</b></td>
<td ></td>
<td></td>
</tr>
<tr th:each="sb, poz : ${product}">
<td th:text="${poz.count}">1</td>
<td ><img th:src="${sb.cover}" alt="cover"/> </td>
<td th:text="${sb.title}"></td>
<td th:text="${sb.price}"></td>
<td><a th:href="@{/details(id=${sb.id})}" >DETAILS</a></td>
<td ><b><a th:href="@{/cart(orderId=${sb.title})}" >ADD TO CART</a></b></td>
    </tr>
    </table>
     </form>
    <footer>

    </footer>
</div>
</body>
   </html>

和details.html：

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="utf-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
<title></title>
<meta name="description" content="HTML 5 CSS 3 Spring Form"/>
<meta name="viewport" content="width=device-width,initial-scale=1"/>
    </head>
<body >
<div id="container" align="center">
    <header> </header>
 <form method="get" th:object="${product}">
    <table border="1">
    <tr th:each="sb : ${product}">
    <td><b>TITLE :</b></td>
    <td th:text="${sb.title}"></td>
    </tr>
    <tr>
    <td><b>AUTHORS :</b></td>
    <td th:text="${sb.author}"></td>
    </tr>
    <tr>
    <td><b>DESCRIPTION :</b></td>
    <td th:text="${sb.description}">D
    </td>
    </tr>
    <tr>
    <td colspan="2" align="center">
    </td>
    </tr>
    <tr>
    <td><b>PRICE :</b></td>
    <td th:text="${sb.price}">$ 39</td>
    </tr>
    </table>    
   </form>
  <p>
   <a th:href="@{/}">Return to home</a>
</p>    
    <footer>

    </footer>
</div>
<!--! end of #container -->

</body>
</html>

感谢您的帮助。

内部错误导致无法完成此请求

0 个答案: