Spring beans are initializing twice in Spring Web application

Question

We are working on Spring MVC project. We want to initialize all the beans at the time of deploying the EAR. Following is our web.xml file :

    <servlet>
    <servlet-name>Spring</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    </servlet>

    <servlet-mapping>
    <servlet-name>Spring</servlet-name>
    <url-pattern>/rest/*</url-pattern>
    </servlet-mapping>


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

   <listener>
 <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

Below is our Spring configuration file:

<context:component-scan base-package="com"></context:component-scan>
<context:annotation-config></context:annotation-config>
<mvc:annotation-driven></mvc:annotation-driven>

<!-- Switch on the Caching -->
<cache:annotation-driven />

<!-- Do the component scan path -->
<!-- <context:component-scan base-package="caching" /> -->
<bean id="ehcache"
    class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean"
    p:configLocation="WEB-INF/ehcache.xml" p:shared="true" /> <!-- Why changed to true? https://stackoverflow.com/a/16370326 -->

<bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheCacheManager"
    p:cacheManager-ref="ehcache" />

<!-- creating datasource -->
<bean id="dataSourceForFilters"
    class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="org.mariadb.jdbc.Driver" />
    <property name="url" value="jdbc:mariadb://ip:3306/demo" />
    <property name="username" value="remote" />
    <property name="password" value="password" />
</bean>
<bean id="dataSourceForData" class="org.springframework.jndi.JndiObjectFactoryBean">
    <property name="jndiName" value="java:/misoracle"></property>
</bean>

<!-- creating jdbctemplate and injecting datasource into it -->
<bean id="jdbcTemplateForFilters" class="org.springframework.jdbc.core.JdbcTemplate">
    <property name="dataSource" ref="dataSourceForFilters"></property>
</bean>
<bean id="jdbcTemplateForData" class="org.springframework.jdbc.core.JdbcTemplate">
    <property name="dataSource" ref="dataSourceForData"></property>
</bean>
<!-- end -->

<bean id="applicationContextProvider" class="com.providers.ApplicationContextProvider"></bean>

We are using component annotations(@Controller,@Service,@Repository) for defining beans.

While deploying the EAR into the server, Beans are initializing fine as per our requirement.

When we are hitting the application with URL pattern like 'IP:port/context-root/rest', Spring beans are initializing once again.

Why beans are initializing again, can someone please help ?

Questions seeking debugging help ("why isn't this code working?") must include the desired behavior, a specific problem or error and the shortest code necessary to reproduce it in the question itself. Questions without a clear problem statement are not useful to other readers. See: How to create a Minimal, Complete, and Verifiable example. — Mickael, Jul 27 '17 at 08:20
Share your spring-servlet.xml. And also share your project directory and error logs. — KayV, Jul 27 '17 at 08:38
It is loaded twice because you tell it to do so. Both the `ContextLoaderListener` and `Dispatcherservlet` load the `spring-servlet.xml` and thus everything is loaded twice. — M. Deinum, Jul 27 '17 at 10:44

score 1 · Accepted Answer · answered Jul 27 '17 at 10:56

Your web.xml mapping should be like this:

<servlet>
    <servlet-name>Spring</servlet-name>
    <servlet-class>
        org.springframework.web.servlet.DispatcherServlet
    </servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value></param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>Spring</servlet-name>
    <url-pattern>/rest/*</url-pattern>
</servlet-mapping>
<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/Spring-servlet.xml</param-value>
</context-param>

Thanks for your answer. Would you please explain how it was working earlier and how it is working now. — YogendraR, Jul 27 '17 at 14:52

Spring beans are initializing twice in Spring Web application

1 Answers1