在响应已经提交Tomcat Spring MVC后无法调用senderror（）

Question

如果我在控制器类中返回一个Employee对象，我会收到来自REST服务的响应。但是如果我试图返回一个List，那么我经常会收到这个错误：

错误：在提交响应后无法调用senderror（） （还附上图片） 我正在使用Eclipse，tomcat，maven和Spring REST服务。

这是我的Controller类代码片段，它正在返回Employee，一切都很好，我可以在浏览器上看到我的JSON数据。但是当我将Employee更改为List作为我的新返回类型时，我收到以下错误，我的Eclipse也会挂起几分钟。我认为我的问题可能与JSON转换器有关。请帮忙。

@Controller
@RequestMapping("/emp")
public class EMPController {

@Autowired
EmployeeService empservice;
@RequestMapping("byname3/{name}")
@ResponseBody
public Employee getByName(@PathVariable String name) {
    System.out.println("Inside getByName()..successfully..EMPController");
    .....
    ......

我的dispatcher-servlet.xml

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
       http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">


    <context:component-scan base-package="com.spice.controller" />
    <context:component-scan base-package="com.spice.daoImpl" />
    <context:component-scan base-package="com.spice.serviceImpl " />

    <mvc:annotation-driven />   <!-- tHIS HELPS IN AUTOMATIC JSON-TO-JAVA AND VICE VERSA CONVERTUION -->

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"></property>
        <property name="url" value="jdbc:oracle:thin:@localhost:1521:xe"></property>
        <property name="username" value="tiwari"></property>
        <property name="password" value="tiwari"></property>
    </bean>

    <bean id="mysessionFactory"
        class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <!-- eARLIER i WAS USING org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean -->
        <!-- BUT THIS LEADS TO SOME CACHE PROVIDER CLASS NOT FOUND EXCEPTION -->
        <!-- ALSO THIS AnnotationSessionFactoryBean IS NOW REPLACED BY LocalSessionFactoryBean -->
        <property name="dataSource" ref="dataSource"></property>

         <property name="annotatedClasses">
            <list>
                <value>com.spice.beans.Employee</value>
                <value>com.spice.beans.Address</value>
            </list>
        </property>


        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.OracleDialect</prop>
                <prop key="hibernate.hbm2ddl.auto">update</prop>
                <prop key="hibernate.show_sql">true</prop>
            </props>
        </property>
    </bean>

    <tx:annotation-driven transaction-manager="transactionManager" /> 

    <bean id="transactionManager"  
        class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <!-- THIS CLASS IS COMPATIBLE WITH ABOVE VERSIONS OF SPRING AND HIBERNATE  -->  
        <property name="sessionFactory" ref="mysessionFactory" />  
    </bean>

</beans>

Answer 1

  

错误：在提交响应后无法调用senderror（）   （也附在图片上）

此错误是另一个错误的后果。服务器遇到了应用程序的主要异常，因此它试图调用HttpServletResponse＃sendError（），它依次抛出IllegalStateException。