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From Dave Newton <davelnew...@gmail.com>
Subject Re: Spring Injection Strange behaviour
Date Sat, 05 Sep 2015 13:27:16 GMT
Not sure, but if nothing else the action should be set to `prototype`
scope, as they're instantiated per-request.

Are you using the Struts 2 Spring plugin?

On Sat, Sep 5, 2015 at 8:47 AM, Chris <crispyoz@gmx.us> wrote:

> I'm trying to use the Spring plugin to inject a dependency into my action
> at runtime. This is the first time I've tried this with Struts2 so I may
> have missed something but I'm stumped because I can see the dependency is
> injected but then the object is later null when I need to use it. Here is
> my action class code:
>
> public class UserRegisterAction extends ActionSupport {
>     private User user = new User();
>
>     @Override
>     public String execute(){
>         getUserService().saveUser(user);
>         return "success";
>     }
>
>     public UserServiceImpl getUserService(){
>         return userService;
>     }
>
>     UserServiceImpl userService;
>     public void setUserService(UserServiceImpl us){
>         this.userService = us;
>     }
> }
>
> Using the debugger I can see that upon startup "setUserService is called
> and this.userService is set, so the injection appears to be working ok, but
> when the execute method is called when the page is submitted userService is
> null. I'm quite new to Struts but I don't understand how my userService is
> being null.
>
> Can anyone see what I am missing?
>
>
> My applicationContext:
>
>
> <?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:tx="
> http://www.springframework.org/schema/tx"
>        xsi:schemaLocation="http://www.springframework.org/schema/beans
> http://www.springframework.org/schema/beans/spring-beans.xsd
>        http://www.springframework.org/schema/tx
> http://www.springframework.org/schema/tx/spring-tx.xsd"
> default-autowire="byName">
>
>     <bean
> class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor"
> />
>
>     <bean
> class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor"/>
>
>     <bean id="entityManagerFactory"
> class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
>         <property name="dataSource" ref="dataSource" />
>         <property name="jpaVendorAdapter">
>             <bean
> class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
>                 <property name="databasePlatform"
> value="org.hibernate.dialect.MySQL5Dialect" />
>                 <property name="database" value="MYSQL" />
>                 <property name="showSql" value="true" />
>             </bean>
>         </property>
>     </bean>
>
>     <bean id="dataSource"
> class="org.springframework.jdbc.datasource.DriverManagerDataSource">
>         <property name="driverClassName" value="org.gjt.mm.mysql.Driver" />
>         <property name="url" value="jdbc:mysql://127.0.0.1:3306/baseapp"
> />
>         <property name="username" value="xxxxxx" />
>         <property name="password" value="xxxxxx" />
>     </bean>
>
>     <bean id="transactionManager"
> class="org.springframework.orm.jpa.JpaTransactionManager">
>         <property name="entityManagerFactory" ref="entityManagerFactory" />
>     </bean>
>
>     <tx:annotation-driven transaction-manager="transactionManager" />
>
>     <bean id="userService" class="com.xxxxx.service.UserServiceImpl"
> scope="prototype"/>
>
>     <bean id="userAction" class="com.xxxxxx.action.UserRegisterAction">
>         <property name="userService" ref="userService"/>
>     </bean>
>
> </beans>
>
>
> Web.xml:
>
> <?xml version="1.0" encoding="UTF-8"?>
> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
>          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>          xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
> http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
>          version="3.1">
>
>    <filter>
>         <filter-name>struts2</filter-name>
>
> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
>     </filter>
>
>     <filter-mapping>
>         <filter-name>struts2</filter-name>
>         <url-pattern>/*</url-pattern>
>     </filter-mapping>
>
>     <listener>
>
> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
>     </listener>
> </web-app>
>
>
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>


-- 
e: davelnewton@gmail.com
m: 908-380-8699
s: davelnewton_skype
t: @dave_newton <https://twitter.com/dave_newton>
b: Bucky Bits <http://buckybits.blogspot.com/>
g: davelnewton <https://github.com/davelnewton>
so: Dave Newton <http://stackoverflow.com/users/438992/dave-newton>

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