CODEWITHSUNDEEP
javajsfservlets
mona
mona

Reputation: 6309

How to add a class to the application scope for a web application

Need to add a Java class (named HistoryBean in my project) to the ServletContext. I do not want to create new instance of the HistoryBean class in the different Servlets that I have inside my project. I want to get it from the ServletContext. Please help me with suggestions.

Upvotes: 0

Views: 310

Answers (2)

BalusC
BalusC

Reputation: 1109292

As you're using JSF, just register it as an application scoped bean.

@ManagedBean(eager=true)
@ApplicationScoped
public class HistoryBean {
    // ...
}

(note the eager=true, this autoconstructs the bean on webapp's startup without the need to reference it in some view or bean, you don't need a ServletContextListener for this)

This way it's not only available in JSF context the usual way as #{historyBean}, but it's in servlets also available as a servlet context attribute with the managed bean name as key as follows:

HistoryBean historyBean = (HistoryBean) getServletContext().getAttribute("historyBean");

Upvotes: 3

Bozho
Bozho

Reputation: 597264

You can do that in a ServletContextListener:

public void contextInitialized(ServletContextEvent e) {
     e.getServletContext().setAttribute("historyBean", new HistoryBean());
}

Register your listener with @WebListener or with <listener>..</listener> in web.xml.

Upvotes: 3

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