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POAutowiring doesn't work in Spring
 

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  1. POAutowiring doesn't work in Spring
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    <p>I'm trying to write web application using wicket + hibernate + spring. And like all guys I'd like to use @Autowired annotation. First of all, here is my applicationContext.xml:</p> <pre><code>&lt;beans default-autowire="autodetect" 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:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd"&gt; &lt;context:annotation-config/&gt; &lt;bean id="placeholderConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"&gt; &lt;property name="ignoreUnresolvablePlaceholders" value="false"/&gt; &lt;property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE"/&gt; &lt;property name="ignoreResourceNotFound" value="false"/&gt; &lt;property name="locations"&gt; &lt;list&gt; &lt;value&gt;classpath*:/application.properties&lt;/value&gt; &lt;/list&gt; &lt;/property&gt; &lt;/bean&gt; &lt;bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"&gt; //connection... &lt;/bean&gt; &lt;tx:annotation-driven transaction-manager="txManager"/&gt; &lt;!-- setup transaction manager --&gt; &lt;bean id="txManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"&gt; &lt;property name="sessionFactory"&gt; &lt;ref bean="sessionFactory"/&gt; &lt;/property&gt; &lt;/bean&gt; &lt;!-- hibernate session factory --&gt; &lt;bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"&gt; //some hibernate stuff &lt;/bean&gt; //wicket app bean &lt;bean id="wicketApplication" class="com.team.wicket.ShopApp" scope="singleton"/&gt; //DAO beans &lt;bean id="userDAO" class="com.team.wicket.daoImpl.UserDAOImpl" scope="singleton"/&gt; &lt;bean id="contactDAO" class="com.team.wicket.daoImpl.ContactDAOImpl" scope="singleton"/&gt; </code></pre> <p></p> <p>here is web.xml:</p> <pre><code> &lt;display-name&gt;wicket-spring-hibernate&lt;/display-name&gt; &lt;context-param&gt; &lt;param-name&gt;contextConfigLocation&lt;/param-name&gt; &lt;param-value&gt;classpath:applicationContext.xml&lt;/param-value&gt; &lt;/context-param&gt; &lt;listener&gt; &lt;listener-class&gt;org.springframework.web.context.ContextLoaderListener&lt;/listener-class&gt; &lt;/listener&gt; &lt;filter&gt; &lt;filter-name&gt;opensessioninview&lt;/filter-name&gt; &lt;filter-class&gt;org.springframework.orm.hibernate3.support.OpenSessionInViewFilter&lt;/filter-class&gt; &lt;/filter&gt; &lt;filter&gt; &lt;filter-name&gt;wicket-spring-hibernate&lt;/filter-name&gt; &lt;filter-class&gt;org.apache.wicket.protocol.http.WicketFilter&lt;/filter-class&gt; &lt;init-param&gt; &lt;param-name&gt;applicationFactoryClassName&lt;/param-name&gt; &lt;param-value&gt;org.apache.wicket.spring.SpringWebApplicationFactory&lt;/param-value&gt; &lt;/init-param&gt; &lt;init-param&gt; &lt;param-name&gt;applicationClassName&lt;/param-name&gt; &lt;param-value&gt;com.mycompany.WicketApplication&lt;/param-value&gt; &lt;/init-param&gt; &lt;/filter&gt; &lt;filter-mapping&gt; &lt;filter-name&gt;opensessioninview&lt;/filter-name&gt; &lt;url-pattern&gt;/*&lt;/url-pattern&gt; &lt;/filter-mapping&gt; &lt;filter-mapping&gt; &lt;filter-name&gt;wicket-spring-hibernate&lt;/filter-name&gt; &lt;url-pattern&gt;/*&lt;/url-pattern&gt; &lt;/filter-mapping&gt; &lt;/web-app&gt; </code></pre> <p>Actually I need to use @Autowired only with userDAO and contactDAO beans. The code of UserDAOImpl and ContactDAOImpl starts with @Service annotation:</p> <pre><code>@Service public class ContactDAOImpl implements ContactDAO { .... public ContactDAOImpl() { System.out.println("contactDAO created"); } @Service public class UserDAOImpl implements UserDAO { ... public UserDAOImpl() { System.out.println("UserDAO created"); } </code></pre> <p>As you can see I've added System.out to the default construstors of the classes because I wanted to be sure that spring creates beans. And it really creates beans every time I start application so the problem must be with autowiring. And finally here is the class where autowiring fails:</p> <pre><code>public class UserSession extends AuthenticatedWebSession { @Autowired @Qualifier("userDAO") private UserDAO userDAO; private User user; public UserSession(Request request) { super(request); } @Override public boolean authenticate(String username, String password) { User user = userDAO.getUser(username, password); if (user != null) { setUser(user); return true; } return false; } @Override public Roles getRoles() { Roles roles = new Roles(); if (isSignedIn()) { roles.add(Roles.USER); } return roles; } public User getUser() { return user; } public void setUser(User user) { this.user = user; } } </code></pre> <p>when authenticate() tries to call getUser(...) it gives a NullPointerException. From debuging I know that UserDAO is not initialized (it is just null) and I also know that Spring creates UserDAO and ContactDAO beans. So what I'm doing wrong? Thanks.</p>
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    1. USAndrey Yaskulsky
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    1. COWhy the @Qualifier? Your beans does not seem to be qualified.
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      1. POAutowiring doesn't work in Spring
      1. USEdwin Dalorzo
 

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