Struts 使用 DynaValidatorForm 的项目给出 HTTP 状态 500 错误 - "Resources cannot be null"

Question

我正在学习 Struts 并且我已经使用 maven + hibernate + Struts 创建了一个项目。当我运行项目 JSP 加载但是当我提交数据时，出现以下错误 -

HTTP Status 500 - java.lang.IllegalArgumentException: Resources cannot be null.

我已经尽力了，但我找不到问题所在。下面是我的源代码。

Web.xml :-

<web-app version="2.5" 
xmlns="http://java.sun.com/xml/ns/javaee" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

<welcome-file-list>
    <welcome-file>Customer.jsp</welcome-file>
</welcome-file-list>

<servlet>
    <servlet-name>action</servlet-name>
    <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>

    <init-param>
        <param-name>config</param-name>
        <param-value>/WEB-INF/struts-config.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
    <servlet-name>action</servlet-name>
    <url-pattern>*.do</url-pattern>
</servlet-mapping>

Struts-config.xml:-

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC       "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN"        "http://jakarta.apache.org/struts/dtds/struts-config_1_3.dtd">

<struts-config>
    <form-beans>
        <form-bean name="customerActionForm" type="org.apache.struts.validator.DynaValidatorForm">
            <form-property name="name" type="java.lang.String"></form-property>
            <form-property name="age" type="java.lang.String"></form-property>
            <form-property name="contactNo" type="java.lang.String"></form-property>
            <form-property name="email" type="java.lang.String"></form-property>
        </form-bean>
</form-beans>

<action-mappings>
    <action path="/register" name="customerActionForm" parameter="parameter" type="com.openarc.struts.action.CustomerAction" input="Customer.jsp">
        <forward name="success" path="index.jsp"></forward>
    </action>
</action-mappings>

<message-resources parameter="errors"/>

errors.properties（之前用于验证器框架）

label.name = Name
label.age = Age
label.contactNo = Contact Number
label.email = Email

Customer.jsp :-

<body>
    <html:form action="register">
        <table>
            <tr>
                <td><bean:message key="label.name"/> </td>
                <td><html:text property="name"></html:text></td>
            </tr>
            <tr>
                <td><bean:message key="label.age"/> </td>
                <td><html:text property="age"></html:text></td>
            </tr>
            <tr>
                <td><bean:message key="label.contactNo"/> </td>
                <td><html:text property="contactNo"></html:text></td>
            </tr>
            <tr>
                <td><bean:message key="label.email"/> </td>
                <td><html:text property="email"></html:text></td>
            </tr>
            <tr>
                <td></td>
                <td><html:submit property="parameter" value="Create Customer"></html:submit> </td>
            </tr>
        </table>
    </html:form>
</body>

CustomerAction.java:-

public class CustomerAction extends DispatchAction{

    public ActionForward createCustomer(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {
        DynaActionForm dynaForm = (DynaActionForm)form;

        Customer customer = new Customer();
        customer.setCustomerId(1);
        customer.setName(dynaForm.getString("name"));
        customer.setAge(Short.parseShort(dynaForm.getString("age")));
        customer.setContactNo(dynaForm.getString("contactNo"));
        customer.setEmail(dynaForm.getString("email"));

        CustomerDAO customerDAO = new CustomerDAO();
        customerDAO.createCustomer(customer);

        return mapping.findForward("success");
    }
}

CustomerDAO.java:-

public class CustomerDAO {

    public Customer createCustomer(Customer customer){
        Transaction transaction = null;
        try{
            Session session = HibernateUtil.openSession();
            transaction = session.beginTransaction();
            session.save(customer);
            session.flush();
            transaction.commit();
            session.close();
        }catch(Exception e){
            transaction.rollback();
            e.printStackTrace();
        }finally{
            HibernateUtil.closeSession();
        }
        return customer;
    }
}

HibernateUtil.java :-

public class HibernateUtil {
    private static final SessionFactory SESSIONFACTORY = createSessionFactory();
    private static final ThreadLocal<Session> THREADLOCAL = new ThreadLocal<Session>();

    private static SessionFactory createSessionFactory() {
        try{
            return new Configuration().configure().buildSessionFactory();
        }catch(HibernateException e){
             System.err.println("Initial SessionFactory creation failed." + e);
             throw new ExceptionInInitializerError(e);
        }
    }

    public static Session openSession(){
        Session session = THREADLOCAL.get();
        if(session == null){
            session = SESSIONFACTORY.openSession();
            THREADLOCAL.set(session);
        }
        return session;
    }

    public static void closeSession(){
        Session session = THREADLOCAL.get();
        if(session.isOpen()){
            session.close();
            THREADLOCAL.remove();
        }
    }
}

我在网上搜索时似乎是一个著名的错误，但我找不到我的代码到底有什么问题。任何帮助将不胜感激。

Answer 1

在struts-config.xml的内容下方添加插件。希望它能解决您的问题。

<plug-in className="org.apache.struts.validator.ValidatorPlugIn">
<set-property
property="pathnames"
value="/org/apache/struts/validator/validator-rules.xml,
/WEB-INF/validation.xml"/>
</plug-in>

并且不要忘记在 /WEB-INF/validation.xml

中初始化 validation.xml 文件

Struts 使用 DynaValidatorForm 的项目给出 HTTP 状态 500 错误 - "Resources cannot be null"

Struts project with DynaValidatorForm gives HTTP status 500 error - "Resources cannot be null"

java

hibernate

jsp

struts