HTTP状态500 - 在第21行处理JSP页面/WEB-INF/views/addDepartment.jsp时发生异常[重复]

Question

我正在尝试从我的 spring mvc 应用程序的 addDepartment.jsp 页面中的数据库中删除一个部门。我尝试删除时确实收到此错误

org.apache.jasper.JasperException: An exception occurred processing JSP page /WEB-INF/views/addDepartment.jsp at line 21

18:                 </tr>
19:                 <tr>
20:                     <td><form:label path="departmentName">Department Name:</form:label></td>
21:                     <td><form:input path="departmentName" value="${department.departmentName}"/></td>
22:                 </tr>
23:                 
24:                 <tr>

这是 addDepartment.jsp 文件的第 21 行

21:                     <td><form:input path="departmentName" value="${department.departmentName}"/></td>

这是处理删除功能的视图控制器

@RequestMapping(value = "/deleteDepartment", method = RequestMethod.GET)
    public ModelAndView deleteCategory(@ModelAttribute("command")  Department department,
            BindingResult result) {
        departmentService.deleteDepartment(department.getDepartmentId());
        Map<String, Object> model = new HashMap<String, Object>();
        model.put("department",  departmentService.getDepartments());
        return new ModelAndView("addDepartment", model);
    }

这是错误的根本原因堆栈跟踪

java.lang.NumberFormatException: For input string: "departmentName"
    java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
    java.lang.Integer.parseInt(Integer.java:580)
    java.lang.Integer.parseInt(Integer.java:615)

这是处理从 addDepartment.jsp 文件中删除的代码视图

<c:forEach items="${departments}" var="department">
            <tr>
                <td><c:out value="${department.departmentId}"/></td>
                <td><c:out value="${department.departmentName}"/></td>
                <td align="center"><a href="editDepartment?departmentId=${department.departmentId}">Edit</a> | <a href="deleteDepartment?departmentId=${department.departmentId}">Delete</a></td>
            </tr>
        </c:forEach>

为什么我无法删除部门名称？

Answer 1

如果我错了，请纠正我，但异常与 deleteDepartment 代码无关，而是与 addDepartment.jsp 页面有关，那么您是如何将这两者联系在一起的？

在我看来，从 numberFormatException 来看，好像 java 正在尝试将 departmentName 值转换为整数。这当然没有意义，因为我想您将向该字段提供一个字符串。

我不完全确定问题出在您共享的代码中，但我感觉有些混淆了按部门 ID 或部门名称选择“部门”，以便将其删除。因此，会发生从字符串值到引发异常的数字值的转换。