how to initiate hashtable and linklist

[pradeep gamage]

I am developing project by using Spring 3.0, JSF 2 . so what my requirement is when application load at first time load the some data to HashTable and ArrayList(whatever Collection). this is my web.xml file
<?xml version="1.0" encoding="UTF-8"?> <web-app id="WebApp_ID" version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <display-name>mytesting</display-name> <context-param> <param-name>log4jConfigLocation</param-name> <param-value>META-INF/properties/log4j.properties</param-value> </context-param> <listener> <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class> </listener> <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/user-config.xml /WEB-INF/user-security.xml</param-value> </context-param> <context-param> <param-name>javax.faces.DEFAULT_SUFFIX</param-name> <param-value>.xhtml</param-value> </context-param> <context-param> <description>State saving method: 'client' or 'server' (=default). See JSF Specification 2.5.2</description> <param-name>javax.faces.STATE_SAVING_METHOD</param-name> <param-value>server</param-value> </context-param> <context-param> <param-name>javax.servlet.jsp.jstl.fmt.localizationContext</param-name> <param-value>resources.application</param-value> </context-param> <context-param> <param-name>org.richfaces.skin</param-name> <param-value>ruby</param-value> </context-param> <context-param> <param-name>primefaces.PRIVATE_CAPTCHA_KEY</param-name> <param-value>6LeJTGCGHBNnbjgfh5t78O3ljniqYTNS1</param-value> </context-param> <context-param> <param-name>primefaces.PUBLIC_CAPTCHA_KEY</param-name> <param-value>6LeJT8QSsfasfdasfdsfsdfsX7wv0cGiTD6P</param-value> </context-param> <filter> <filter-name>springSecurityFilterChain</filter-name> <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class> </filter> <filter-mapping> <filter-name>springSecurityFilterChain</filter-name> <url-pattern>/*</url-pattern> <dispatcher>FORWARD</dispatcher> <dispatcher>REQUEST</dispatcher> </filter-mapping> <listener> <listener-class>org.springframework.security.web.session.HttpSessionEventPublisher</listener-class> </listener> <listener> <listener-class>com.sun.faces.config.ConfigureListener</listener-class> </listener> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <servlet> <servlet-name>Faces Servlet</servlet-name> <servlet-class>javax.faces.webapp.FacesServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet> <servlet-name>Resource Servlet</servlet-name> <servlet-class>org.primefaces.resource.ResourceServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>Faces Servlet</servlet-name> <url-pattern>/faces/*</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>Resource Servlet</servlet-name> <url-pattern>/primefaces_resource/*</url-pattern> </servlet-mapping> <session-config> <session-timeout>30</session-timeout> </session-config> <welcome-file-list> <welcome-file>faces/index.xhtml</welcome-file> </welcome-file-list> <persistence-unit-ref> <description>Persistence Unit for Registration</description> <persistence-unit-ref-name>persistence/BankPU</persistence-unit-ref-name> <persistence-unit-name>bankPU</persistence-unit-name> </persistence-unit-ref> </web-app>

how i can use init param to load some data to HashTable or ArrayList. give me your valuable comment..

Thanks in Advance

[Sagar Rohankar]

Using web.xml:
http://wiki.metawerx.net/wiki/Web.xml.InitParam

Using spring app context:
http://static.springsource.org/spring/docs/3.0.x/reference/xsd-config.html#xsd-config-body-schemas-util-list

[pradeep gamage]

Thank you for valuable link.what I want is when application load at first time load the some data to HashTable and ArrayList from database table. how i can manage it?
Thanks in advance..........

[Sagar Rohankar]

May be Serlvet context listener helps:
http://download.oracle.com/javaee/6/api/javax/servlet/ServletContextListener.html

[Mark Spritzler]

Sagar Rohankar wrote:May be Serlvet context listener helps:
http://download.oracle.com/javaee/6/api/javax/servlet/ServletContextListener.html

Sorry Sagar. How do you even know if they have a web application?

For a Spring application, and for some simple task like what is needed here, a ContextListener is way overkill.

So an init-method is just a method that runs right after an object gets instantiated and all its dependencies and properties have been set.

<bean id="mark" class="com.something.SomeClass" init-method="someMethod">
    <constructor-arg ref="dataSource"/>
</bean>

public class SomeClass {
    
    private Map<String, Something> aMap = new HashMap<String, Something>();
    public SomeClass(DataSource dataSource) {
        this.dataSource = dataSource;
    }

    public void someMethod() {
        // Have code that uses the DataSource and goes to the database to load data, then put that data into the Map here
    }
}

SomeClass will be instantiated by Spring, the dataSource dependency will be injected, any properties will be set, then the someMethod method will be called.

That is how init-method works.

Mark

[pradeep gamage]

I have solved my problem by using spring. i have add spring bean to execute when application loading time.

<bean id="orderManageCollections" class="Qualified class name" scope="singleton" lazy-init="false" init-method="method name that should be run when application loading time"></bean>

[Sagar Rohankar]

Mark Spritzler wrote:

Sagar Rohankar wrote:May be Serlvet context listener helps:
http://download.oracle.com/javaee/6/api/javax/servlet/ServletContextListener.html

Sorry Sagar. How do you even know if they have a web application?

Well, I guess that from the web.xml posted!

Definitely, for init-method

[Mark Spritzler]

Sagar Rohankar wrote:Well, I guess that from the web.xml posted!

DOH!. See how much I pay attention to the details. ;)

Mark

[pradeep gamage]

Thanks all valuable posts................