problems loading applicationcontext

[andrea_z]

Hi,
I have a problem when start my web application.
It seem Tomcat 5.0.27 not load applicationcontext.

The file web.xml is very simple:

  <servlet>
		<servlet-name>example</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<load-on-startup>2</load-on-startup>
  </servlet>

  <servlet>
    <servlet-name>context</servlet-name>
    <servlet-class>org.springframework.web.context.ContextLoaderServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>

My servlet-context.xml is:

<!--
  - Application context definition for "example" DispatcherServlet.
  -->

<beans>
	<bean name="/test" class="web.XmlController"/>
</beans>

My applicationContext.xml is:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http&#58;//www.springframework.org/dtd/spring-beans.dtd">
<beans>

	<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="locations">
			<list>
				<value>/properties/jdbc.properties</value>
			</list>
		</property>
	</bean>

  <bean id="myDataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName"><value>$&#123;jdbc.driverClassName&#125;</value></property>
    <property name="url"><value>$&#123;jdbc.url&#125;</value></property>
    <property name="username"><value>$&#123;jdbc.username&#125;</value></property>
    <property name="password"><value>$&#123;jdbc.password&#125;</value></property>
  </bean>

  <bean id="trasferimentiDao" class="dao.impl.jdbc.JdbcTrasferimentiDao">
    <property name="dataSource">
      <ref bean="myDataSource"/>
    </property>
  </bean>

  <bean id="listeManager" class="domain.logic.ListeImpl">
    <property name="trasferimentiDao"><ref bean="trasferimentiDao"/></property>
  </bean>

</beans>

My business class is:

public class ListeImpl implements Liste {

  private TrasferimentiDao trasferimentiDao;

  public void setTrasferimentiDao(TrasferimentiDao trasferimentiDao) {
    this.trasferimentiDao = trasferimentiDao;
  }

  /**
   * Stored Procedure LISTA_TRASFERIMENTI
   * @return
   */
  public Collection ListaTrasferimenti()  throws DataAccessException {
    List output = new ArrayList();
    System.out.println("Iniezione: " + trasferimentiDao);
    List trasferimenti = (List) trasferimentiDao.getTrasferimenti();
    Iterator i = trasferimenti.iterator();
    while (i.hasNext()) {
    // do something
    ........
    return output;
  }
}

Application returns a nullPointerException on variable trasferimentiDao.
I verified that trasferimentiDao is null.
Why trasferimentiDao si null?

If I build a unit test:

public class ListeTest  extends junit.framework.TestCase {
  private ApplicationContext applicationContext;
  private Liste listeManager;

  protected void setUp() {
    applicationContext = new FileSystemXmlApplicationContext("/WEB-INF/applicationContext.xml");
    listeManager = (Liste) applicationContext.getBean("listeManager");
  }

  public void ListaTrasferimentiTest(){
    Collection c = listeManager.ListaTrasferimenti();
  }
}

In above test trasferimentiDao is loaded and all run is OK.

Thanks in advance for any suggest.
Andrea

[katentim]

Try re-naming servlet-context.xml to example-context.xml.

Or changing your web.xml:

<servlet>
  <servlet-name>example</servlet-name>
  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  <init-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/servlet-context.xml</param-value>
  </init-param>
  <load-on-startup>2</load-on-startup>
</servlet>

See DispatcherServlet initialization parameters for details.

[andrea_z]

Thanks for your suggest.
According to what it is written on LanguageReference document:

...The default BeanFactory used by the DispatcherServlet is the XmlBeanFactory and the
DispatcherServlet will on initialization look for a file named [servlet-name]-servlet.xml in the WEB-INF
directory of your web application.....


I have renamed servlet-context.xml to example-servlet.xml.
"example" is the name of DispatcherServlet.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http&#58;//www.springframework.org/dtd/spring-beans.dtd">

<!--
  - Application context definition for "example" DispatcherServlet.
  -->

<beans>
  <bean name="/test" class="web.XmlController"/>

  <bean id="xmlController" class="web.XmlController" >
    <property name="procedura"><ref bean="listeManager"/></property>
  </bean>
</beans>

public class XmlController implements Controller, InitializingBean {

  private Liste procedura;

  public void setProcedura(Liste procedura) {
    this.procedura = procedura;
  }

  public ModelAndView handleRequest(
    HttpServletRequest request,
    HttpServletResponse response)
    throws ServletException, IOException {
    String nomeProcedura = request.getParameter("procedura");
    System.out.println("nomeProcedura: "+nomeProcedura);
    if (nomeProcedura.equals("LISTA_TRASFERIMENTI")) {
      Liste procedura = new ListeImpl();
      Document document = procedura.xmlListaTrasferimenti();
      String strDocument = document.asXML();
      PrintWriter out = response.getWriter();
    }
    return new ModelAndView("/test.jsp");
  }


  public void afterPropertiesSet() throws Exception {
      if (procedura == null)
        throw new ApplicationContextException("Must set procedura bean property on " + getClass());
  }
}

But not run.
A piece of stack trace is :

INFO: Destroying singletons in factory {org.springframework.beans.factory.suppor
t.DefaultListableBeanFactory defining beans [/test,xmlController]; parent: org.s
pringframework.beans.factory.support.DefaultListableBeanFactory defining beans [
propertyConfigurer,myDataSource,trasferimentiDao,cartellaInfermieristicaDao,list
eManager,cartellaInfermieristicaManager]; root of BeanFactory hierarchy}
28-giu-2005 16.08.06 org.springframework.web.servlet.FrameworkServlet initServle
tBean
GRAVE: Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean wit
h name '/test' defined in ServletContext resource [/WEB-INF/example-servlet.xml]
: Initialization of bean failed; nested exception is org.springframework.context
.ApplicationContextException: Must set procedura bean property on class web.XmlC
ontroller
org.springframework.context.ApplicationContextException: Must set procedura bean
 property on class web.XmlController
        at web.XmlController.afterPropertiesSet(XmlController.java:73)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBean
Factory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:937)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBean
Factory.createBean(AbstractAutowireCapableBeanFactory.java:334)

Indicating that ApplicationContext is not loaded.
Katentim, have you any idea?
Thanks a lot.

[Asya]

I think you need to change

 <servlet>
    <servlet-name>context</servlet-name>
    <servlet-class>org.springframework.web.context.ContextLoaderServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>

to

 <servlet>
    <servlet-name>context</servlet-name>
    <servlet-class>org.springframework.web.context.ContextLoaderServlet</servlet-class>
	<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>/WEB-INF/applicationContext.xml</param-value>
		</init-param>    
<load-on-startup>1</load-on-startup>
  </servlet>

And make sure that location of applicationContext.xml is correct

[andrea_z]

Thanks Asya.
However, if I change example-servlet like below it worked,
otherwise it doesn't load the context.

<beans>

<!--	<bean name="/test" class="web.XmlController"/>-->

  <bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
    <property name="mappings">
      <props>
        <prop key="/test">xmlController</prop>
      </props>
    </property>
  </bean>

  <bean id="xmlController" class="web.XmlController" >
    <property name="listeManager"><ref bean="listeManager"/></property>
  </bean>
</beans>

Using this simple mappings, applicationContext is loaded correctly.
I don't understand this behaviour.
Someone has an idea of that?

[brenobarros]

Insert this tags, in your web.xml:


<web-app>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>
....
<servlet>
<servlet-name>SpringContextServlet</servlet-name>
<servlet-class>org.springframework.web.context.ContextLoade rServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
......
</web-pp>

[puppetmasta]

Insert this tags, in your web.xml:


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

Take note of the location of the applicationContext.xml. It is in WEB-INF/ which is the suggested location. In most application servers this isn't a problem since WEB-INF/ is on the classpath. In Tomcat it is NOT, only WEB-INF/classes and WEB-INF/lib are on the classpath and you will get context loading issues.

Not sure if this will solve your problem, but I thought I would make you aware in case this is affecting your app.