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Questions tagged [backing-beans]

118 questions
91
votes
4 answers

How to provide a file download from a JSF backing bean?

Is there any way of providing a file download from a JSF backing bean action method? I have tried a lot of things. Main problem is that I cannot figure how to get the OutputStream of the response in order to write the file content to. I know how to…
zmeda
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61
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11 answers

Difference between managed bean and backing bean

I came across the terms "managed bean" and "backing bean" in several forums. Many people think both are the same. But, there seems to be a slight difference. Can any one help me to understand the exact difference between these two terms?
Krishna
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46
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1 answer

Making Distinctions Between Different Kinds of JSF Managed-Beans

I recently read this article from Neil Griffin Making Distinctions Between Different Kinds of JSF Managed-Beans and it got me thinking about the distinction between different beans in my own application. To quickly summarise the gist: Model…
Laurens
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10
votes
2 answers

Passing the backing bean as a parameter to a Facelet include

I have a Facelet that might be used in different applications. I don't to copy it, but reuse it. I need to pass the backing bean that will manage the view as a parameter, as some logic may vary according to the application where it is used in. I…
Deibys
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10
votes
1 answer

JPA Entity as JSF Bean?

Does it make sense to use Entities as JSF Backing Beans? @Entity @ManagedBean @ViewScoped public class User { private String firstname; private String lastname; @EJB private UserService service; public void submit() { …
Kayser
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8
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2 answers

Conversion Error setting value '52' for 'null Converter'

I'm new to JSF and I have been trying to store data from a form that uses a h:selectOneMenu to get the category of a product. The h:selectOneMenu is being populated from the DB, however, when trying to store a product in the DB, I am getting an…
lv10
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5
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3 answers

How to (or should you) avoid long methods/classes in jsf

I'm mostly working with legacy code in a JSF based project and there are lots of quite long classes and methods in backing beans. This is constantly bugging me but when I look for what can be done, most of the time all I can come up is to divide a…
SelimOber
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5
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4 answers

Calling a managed bean method when some button is clicked

I am new to JSF and want to have a button, which when clicked, will call a method of the backing bean. Is this possible or I have to use AJAX or something? I tried things like But they…
onlinenaman
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4
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5 answers

Injecting EJB3.0 Beans into JSF2.0 Backing Beans... Impossible?

I'm working on a JSF project on Weblogic 11g, and our initial design is calling for JSF Backing Beans to invoke EJB3.0 beans to perform business logic and data access calls. The @EJB annotation doesn't seem to work in my project when I try to inject…
bakoyaro
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4
votes
1 answer

ViewScope constructor called twice, not sure why

I've seen the other questions regarding calling a bean constructor and ViewScope, and I'm still having difficulty. The problem I'm seeing involves two specific pages in my application. The first is a dataTable (for now it is filled with randomly…
Sean
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4
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1 answer

Backing bean organization in JSF

I have been thinking about this for a while now and have yet to come up with a best practice for how to organize my beans/classes in a JSF project for the presentation tier. Obviously there are many factors that come into play, but I would like to…
bhouse
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3
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1 answer

set itemDisabled from backing bean method for each item in list

I have a radiobutton list and would like to disable some items according to the outcome of a backing bean method.
glasspill
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3
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3 answers

JSF 1.2 when invoke bean method by h:commandButton, it does not works all the time

Recently, I have met a really weird problem. It is as follows: In the save page of a typical CRUD workflow, clicking the h:commandButton to call the save method in backing end bean does not work all the time. Sometimes, it works as I expected…
Bo Ye
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3
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1 answer

JSF property transfer from backing bean A to backing bean B

I'm getting deeper into JSF 2.0 at the moment and lacking a bit of understanding about the "transport" of managed bean properties from one view to the other. I searched a bit but haven't found a really good example, so if anyone could point me to a…
Christian Seifert
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3
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1 answer

invoke method of @facescomponent of composite component

I need to invoke a method of backing component(@facescomponent) of composite component. I see others do this in articles but none of them has ever worked for me. this how I invoke:
lazyCoding
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