How to access managed bean (JSF) from JSP

[Yasushi Okubo]

Hi, experts

I need to access properties like list etc initilalized in a managed bean (JSF): testBean from scriptlet section: <%>...</%> on JSP page.

TestBean has been defined in my face-config.xml as a session bean:

<managed-bean>
<managed-bean-name>testBean</managed-bean-name>
<managed-bean-class>org.test.TestBean</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
</managed-bean>

Is it possible to do so ? If so, please advsie me how to do so.

Thanks,
yasushi

Thanks,
yasushi

[Jeff Albertson]

In the interests of coding hygiene, I suggest that you avoid scriptlets. That's easy to do with JSF, but if you insist....

If the bean already exists, you can access it like any session-scoped attribute:

org.test.TestBean x = (org.test.TestBean) request.getSession().getAttribute("testBean");

(Note that there is nothing scriptlet-like about this code. This could be in any Java method.)

If the managed bean hasn't been created yet, this code wouldn't trigger its creation -- instead, getAttribute will return a null reference. To access a managed bean, triggering its creation when needed:

org.test.TestBean x = (org.test.TestBean) Util.getBean("testBean");
 
...
//In Util.java:
public static Object getBean(String expr){
    FacesContext context = FacesContext.getCurrentInstance();
    Application app = context.getApplication();
    ValueBinding binding = app.createValueBinding("#{" + expr + "}");
    Object value = binding.getValue(context);
    return value;
}

[Yasushi Okubo]

Thanks, I will try that.
yasushi

[Yasushi Okubo]

Hi, Jeff

It worked!

yasushi