Java 在SpringMVC中获取错误

我得到以下错误

java.lang.IllegalStateException: **Neither BindingResult nor plain target object for bean name 'course' available as request attribute**
    at org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:144)
    at 

Jsp:

徖

<context:annotation-config />
 <context:component-scan base-package="com.spring" />

<mvc:annotation-driven />
<mvc:resources location="/WEB-INF/" mapping="/**" />


<bean id="jspViewResolver"
    class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="viewClass"
        value="org.springframework.web.servlet.view.JstlView" />
    <property name="prefix" value="/WEB-INF/view/" />
    <property name="suffix" value=".jsp" />
</bean>

<bean id="messageSource"
    class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
    <property name="basename" value="resources/messages" />
    <property name="defaultEncoding" value="UTF-8" />
</bean>

<bean id="propertyConfigurer"
    class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"
    p:location="/WEB-INF/jdbc.properties" />

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
    destroy-method="close" p:driverClassName="${jdbc.driverClassName}"
    p:url="${jdbc.databaseurl}" p:username="${jdbc.username}" p:password="${jdbc.password}" />

<tx:annotation-driven />
<bean id="transactionManager"
    class="org.springframework.orm.hibernate4.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory" />
</bean>

<!-- Hibernate SessionFactory -->
<bean id="sessionFactory"
    class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="packagesToScan">
        <list>
            <value>com.spring.model</value>
        </list>
    </property>
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${jdbc.dialect}</prop>
            <prop key="hibernate.hbm2ddl.auto">update</prop>
            <prop key="hibernate.show_sql">true</prop>
            <!-- <prop key="hibernate.format_sql">true</prop>
            <prop key="hibernate.use_sql_comments">true</prop> -->
        </props>
    </property>
</bean>

com.spring.model
${jdbc.dial}
更新
真的

您与JSP文件中的正确URL不匹配。 更改JSP文件上的此行：

<form:form commandName="course" action="addCourse" method="POST"> 

用于：

---

我只是在我的控制器中添加以下代码

第二件事是，您必须首先将index.jsp文件重定向到其他文件

@RequestMapping(method = RequestMethod.GET)
public String addEmployee(@ModelAttribute("a") A a, Model model,HttpServletRequest request) 
{

    return "addEmployee";
}

正如在文章中所说，加载jsp本身时可能会发生错误，并且 更多的过度绑定可能会失败，原因如下

可以通过BindingResult接口检查绑定结果， 扩展Errors接口：请参阅getBindingResult（）方法。 缺少的字段和属性访问异常将转换为 FieldErrors，在Errors实例中收集，使用以下 错误代码：

---

因此，请检查您可能遗漏的任何类型不匹配或字段，由于我曾亲自面对过这个问题

请解释什么时候会出现错误，以及StackTracened stacktrace是什么来理解这个问题的。我只是使用spring mvc和hibernate将值存储在数据库中。有一个课程名称的输入，我使用courseServise将其添加到数据库中。不知道stacttrace。您是否在spring应用程序上下文中定义了bean？Andreas Hartmann是的，我定义了它。

<context:annotation-config />
 <context:component-scan base-package="com.spring" />

<mvc:annotation-driven />
<mvc:resources location="/WEB-INF/" mapping="/**" />


<bean id="jspViewResolver"
    class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="viewClass"
        value="org.springframework.web.servlet.view.JstlView" />
    <property name="prefix" value="/WEB-INF/view/" />
    <property name="suffix" value=".jsp" />
</bean>

<bean id="messageSource"
    class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
    <property name="basename" value="resources/messages" />
    <property name="defaultEncoding" value="UTF-8" />
</bean>

<bean id="propertyConfigurer"
    class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"
    p:location="/WEB-INF/jdbc.properties" />

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
    destroy-method="close" p:driverClassName="${jdbc.driverClassName}"
    p:url="${jdbc.databaseurl}" p:username="${jdbc.username}" p:password="${jdbc.password}" />

<tx:annotation-driven />
<bean id="transactionManager"
    class="org.springframework.orm.hibernate4.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory" />
</bean>

<!-- Hibernate SessionFactory -->
<bean id="sessionFactory"
    class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="packagesToScan">
        <list>
            <value>com.spring.model</value>
        </list>
    </property>
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${jdbc.dialect}</prop>
            <prop key="hibernate.hbm2ddl.auto">update</prop>
            <prop key="hibernate.show_sql">true</prop>
            <!-- <prop key="hibernate.format_sql">true</prop>
            <prop key="hibernate.use_sql_comments">true</prop> -->
        </props>
    </property>
</bean>

<form:form commandName="course" action="addCourse" method="POST"> 

<form:form commandName="course" action="/addCourse" method="POST">

@RequestMapping(value="/addCourse",method= RequestMethod.POST) 

@RequestMapping(value="addCourse",method= RequestMethod.POST)

@RequestMapping(method = RequestMethod.GET)
public String addEmployee(@ModelAttribute("a") A a, Model model,HttpServletRequest request) 
{

    return "addEmployee";
}

> Missing field error: "required" 
> Type mismatch error: "typeMismatch"
> Method invocation error: "methodInvocation"