春天的单身人士被召唤两次

Question

在我的春季申请中遇到一些问题.

我有非常简单的春豆,它们被注入各种其他春豆.在我发现调试时,它们被调用了两次,Constructor和@PostConstruct都被调用了两次.

我的应用程序没有前端技术.它仅用于与后端任务相关.

弹簧配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:lang="http://www.springframework.org/schema/lang" xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-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/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
        http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang.xsd">


    <context:component-scan base-package="com.green.integration" />

    <!-- ######################################################## -->
    <!-- EXPOSING SPRING BEAN VIA HTTPINVOKER SPRING REMOTING -->
    <!-- ######################################################## -->

    <bean name="/switch"
        class="org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter">
        <property name="service" ref="SwitchController" />
        <property name="serviceInterface"
            value="com.green.ISwitchController" />
    </bean>

    <!-- Load in application properties reference -->
    <bean id="applicationProperties"
        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location" value="classpath:application.properties" />
    </bean>


    <bean id="mongo" class="com.mongodb.Mongo">
        <constructor-arg value="${mongo.server}" />
        <constructor-arg value="${mongo.port}" />
    </bean>

    <bean id="morphia" class="com.google.code.morphia.Morphia">
    </bean>


</beans>

春豆类

@Repository
public class TransactionDAO extends BasicDAO<Transaction, ObjectId>  {
    private Datastore datastore;

    @Autowired
    public TransactionDAO(Mongo mongo, Morphia morphia) {
        super(mongo, morphia, "itransact");
        morphia.map(Transaction.class);
        // TO USE MONGO WITHOUT SECURITY
        this.datastore = morphia.createDatastore(mongo, "itransact");
        logger.debug("***** CONNECTED TO MONGODB SUCCESSFULLY *****");
        this.datastore.ensureIndexes();
        // this.datastore.ensureCaps();
    }
}

构造函数"TransactionDAO"被调用两次.

我试着看看调用堆栈的跟踪

Throwable t = new Throwable();
System.out.println(t.getStackTrace()[1].toString());

每次它显示以下内容

sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

Answer 1

我刚刚想出了问题,特别感谢@Juan Alberto给我提示这个问题.

描述:实际上我给了contextListner和dispatcher servlet的一个applicationContext.xml文件.因此,第一个bean正在初始化弹簧核心,第二个弹簧调度程序.

我现在将配置泄漏到applicationContext.xml和applicationContext-dispatcher.xml中,它们只有相关的配置,我的bean正在初始化一次.

有问题的配置

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>


<servlet>
    <servlet-name>remoting</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/applicationContext.xml</param-value>
    </init-param>
    <load-on-startup>0</load-on-startup>
</servlet>

解决了配置

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>


<servlet>
    <servlet-name>remoting</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/applicationContext-dispatcher.xml</param-value>
    </init-param>
    <load-on-startup>0</load-on-startup>
</servlet>

Answer 2

实际上你的问题是你可能在调度程序servlet中定义bean以及你的spring上下文,调度程序提供了一个不同的上下文但是它(我认为是一个子上下文)的主要上下文所以正确的方法就是让你的主上下文扫描您的"模型类",调度程序只扫描控制器.

我希望这可以帮助你.