1 Reply Latest reply on Apr 25, 2013 8:38 AM by vata2999

    Integrating Seam in Vaadin application problem

    timkepp
    timkepp Mar 11, 2013 12:34 PM

      Hi all

      I'm a newbie in Seam and I'm trying to integrate Seam in a Vaadin application.

      I'm trying to get access to the application context in my UI class but Contexts.getApplicationContext() returns NULL.

      I don't know what I'm doing wrong. Could anybody help me?

       

      Thx

      Tim

       

       

      MyVaadinApplication.java:

      package com.me.ui.application;

import org.jboss.seam.ScopeType;
import org.jboss.seam.annotations.Create;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Scope;
import org.jboss.seam.contexts.Contexts;

import com.me.presenter.TestPresenter;
import com.vaadin.server.VaadinRequest;
import com.vaadin.ui.Label;
import com.vaadin.ui.UI;
import com.vaadin.ui.VerticalLayout;

@Scope (ScopeType.APPLICATION)
@Name("applicationBean")
public class MyVaadinApplication extends UI {

  @Override
  public void init(VaadinRequest request) {
    VerticalLayout layout = new VerticalLayout();
    layout.addComponent(new Label("some stuff"));
    setContent(layout);

    TestPresenter presenter = (TestPresenter) Contexts.getApplicationContext().get(TestPresenter.class); //--> NPE
  }

  @Create
  public void createPresenter() {
    //--> this is never reached
    TestPresenter presenter = (TestPresenter) Contexts.getApplicationContext().get(TestPresenter.class);
  }
}

       

      SeamApplicationServlet.java:

      package com.me.ui.application;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;

import com.vaadin.server.DeploymentConfiguration;
import com.vaadin.server.ServiceException;
import com.vaadin.server.SessionInitEvent;
import com.vaadin.server.SessionInitListener;
import com.vaadin.server.UIClassSelectionEvent;
import com.vaadin.server.UIProvider;
import com.vaadin.server.VaadinServlet;
import com.vaadin.server.VaadinServletService;
import com.vaadin.ui.UI;

public class SeamApplicationServlet extends VaadinServlet {
  private String applicationBean;
  private static final String APPLICATION_BEAN_NAME_PARAM = "applicationBean";

  @Override
  public void init(ServletConfig servletConfig) throws ServletException {
    super.init(servletConfig);

    applicationBean = servletConfig.getInitParameter(APPLICATION_BEAN_NAME_PARAM);

    if(applicationBean == null) {
      throw new ServletException("ApplicationBean not specified in servlet parameters");
    }
  }

  @Override
  protected VaadinServletService createServletService(DeploymentConfiguration deploymentConfiguration) {
    VaadinServletService service = super.createServletService(deploymentConfiguration);
    service.addSessionInitListener(new SessionInitListener() {
         @Override
        public void sessionInit(SessionInitEvent event) throws ServiceException {
          event.getSession().addUIProvider(new SeamProvider());
        }
      });

    return service;
  }

  private class SeamProvider extends UIProvider {
    @Override
    public Class<? extends UI> getUIClass(UIClassSelectionEvent uiClassSelectionEvent) {
      return MyVaadinApplication.class;
    }
  }
}

       

      web.xml:

      <?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
    <display-name>Vaadin Web Application</display-name>

    <context-param>
        <description>Vaadin production mode</description>
        <param-name>productionMode</param-name>
        <param-value>false</param-value>
    </context-param>

    <listener>
        <listener-class>org.jboss.seam.servlet.SeamListener</listener-class>
    </listener>

    <filter>
        <filter-name>Seam Filter</filter-name>
        <filter-class>org.jboss.seam.servlet.SeamFilter</filter-class>
    </filter>

     <filter-mapping>
        <filter-name>Seam Filter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <servlet>
        <servlet-name>Vaadin Application Servlet</servlet-name>
        <servlet-class>com.me.ui.application.SeamApplicationServlet</servlet-class>
        <init-param>
            <description>Vaadin application class to start</description>
            <param-name>applicationBean</param-name>
            <param-value>com.me.ui.application.MyVaadinApplication</param-value>
        </init-param>
    <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>Vaadin Application Servlet</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>
</web-app>

       

      component.xml:

      <?xml version="1.0" encoding="UTF-8"?>
<components xmlns="http://jboss.org/schema/seam/components"
          xmlns:core="http://jboss.org/schema/seam/core"
          xmlns:web="http://jboss.com/products/seam/web"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://jboss.org/schema/seam/core http://jboss.org/schema/seam/core-2.3.xsd
                  http://jboss.org/schema/seam/bpm http://jboss.org/schema/seam/bpm-2.3.xsd
                  http://jboss.org/schema/seam/components http://jboss.org/schema/seam/components-2.3.xsd">

  <component name="org.jboss.seam.core.init">
    <property name="debug">true</property>
  </component>

  <web:context-filter url-pattern="/MyVaadinApplication/*"/>

</components>