How to call an ArrayList stored in applicationScope from another class

Question

I want to call an ArrayList stored in applicationScope from another class

I have a class, something like this that stores a bounch of data in a public variable names AL_data, the method getAllData just store the data in AL_data

public class Application implements Serializable{

    private static final long serialVersionUID = 1L;
    public ArrayList<District> AL_data;

    public Application(){
        try {
            getAllData();
        } catch (NotesException e) {
            e.printStackTrace();
        }
    }
}

And I have set the class as a managed bean in faces-config using applicationScope

<managed-bean>
    <managed-bean-name>App</managed-bean-name>
    <managed-bean-class>com.utils.Application</managed-bean-class>
    <managed-bean-scope>application</managed-bean-scope>
</managed-bean>

I also have another class that I want to use to read the applications scope

public class actions {

    private static Map<String, Object> applicationScope() {
        FacesContext context = FacesContext.getCurrentInstance();
        return (Map<String, Object>) context.getApplication().getVariableResolver().resolveVariable(context,"applicationScope");
    }

    public Vector<String> getDataForCurrentUser() {

        try {

            // how do I access the AL_data arraylist stored in applicationscope
    // ArrayList m = (ArrayList) this.applicationScope();


        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

and I have set this class as a manages bean using sessionScope.

<managed-bean>
    <managed-bean-name>Actions</managed-bean-name>
    <managed-bean-class>com.utils.actions</managed-bean-class>
    <managed-bean-scope>session</managed-bean-scope>
</managed-bean>

I would like to know how I can call the application scope class and access it's public properties, or how I can return my ArrayList.

thanks

Thomas

Answer 1

Add a public method to your application scoped bean that other Java classes can use to access the instance of that bean:

public static Application get() {
    FacesContext context = FacesContext.getCurrentInstance();
    return (Application) context.getApplication().getVariableResolver().resolveVariable("App");
}

You can then use that method to get to the instance of the application scoped bean from your Actions class and then access the methods and variables of that bean:

public class actions {

public Vector<String> getDataForCurrentUser() {
        // Access the AL_data arraylist stored in the App application scoped bean
        ArrayList<District>  m = Application.get().AL_data;
}