<rich:paint2D> - data too large?

[poschd]

Hi everyone,

I am facing a problem with <rich:paint2D> (using Seam and Hibernate), which might be caused by a big data object.

What I need to do is to visualize a database table, so I basically pass an entity bean (let's call it DataBean) to my paint()-method. DataBean has a member variable, which is a list usually consisting of up to 100 elements.

// data bean
public class DataBean {
 // ...
 List<ChildElements> childElements; // usually has up to 100 elements
 // ...
}

In order to test the 2D painting I have copied some simple code into a DataBeanPainter bean. Notice that the example code is completely unrelated to my DataBean:

// DataBeanPainter.paint()
public void paint(Graphics2D g, Object obj) {
 g.setBackground(Color.WHITE);
 g.setColor(Color.BLACK);
 g.drawRect(0, 0, 100, 100);
 g.drawLine(5, 5, 100 - 5, 100 - 5);
 g.drawChars(new String("Ajax4JSF").toCharArray(), 0, 8, 40, 15);
 g.drawChars(new String("mediaOutput").toCharArray(), 0, 11, 5, 45);
}

That's how I use the <rich:paint2D>-tag:

<rich:paint2D data="#{dataBeanHome.instance}"
 paint="#{dataBeanPainter.paint}" width="100" height="100"
 format="gif" cacheable="false"/>

The result is: nothing... RichFaces does generate an < img >-tag, but my browser cannot show this image. However, if I pass a DataBean with an empty list or no data at all, the < img >-tag contains different code and everything works perfectly fine. (Somehow this appears very strange to me, because the image should always be the same, regardless of the data...)

I'm afraid the problem is caused by the "big" list in my DataBean. The RichFaces documentation says to avaid big objects, but is 100 elements really too big? Can anyone give me more information on this issue or has any other suggestions?

[nbelaevski]

Hi,

Check the length of generated URI. It should be not longer than allowed limit (~2K is IE limit).

[poschd]

Yes, the URI is ~8K when passing a "filled" DataBean object. Is there any way to work around this limitation?

[ilya_shaikovsky]

Is there any way to work around this limitation?

no, as written in tld doc -

IMPORTANT: Since serialized data stored in URI, avoid using big objects

and the limitation is not from RF but from browser.

[poschd]

I have now updated my RichFaces libraries from 3.3.1 to 3.3.2SR1, because I thought this could be a problem related to https://jira.jboss.org/jira/browse/RF-3529, but nothing has changed. I am using Firefox, by the way, but the code doesn't work with Internet Explorer neither.

[poschd]

"ilya_shaikovsky" wrote:

Is there any way to work around this limitation?

no, as written in tld doc -

IMPORTANT: Since serialized data stored in URI, avoid using big objects

and the limitation is not from RF but from browser.

I know that it's not an RF limitation, but I would not have expected that <rich:paint2D> doesn't work for any big objects...

[poschd]

So, I am about to despair. I simply cannot think of any (clean) ways to place each child element at a unique position within a table.

Using <rich:dataTable> won't work because there are multiple child elements per row. Is there a way to iterate through my child elements to rerender <h:output> values within my table for each child element?

Can anyone please help out?

[ilya_shaikovsky]

just nest iteration components like:

<rich:column>
 <a4j:repeat value="#{tableVarVariable.childElements}" var="childVar">
 <some:output value="#{childVar.value}"/>
 </a4j:repeat>
<rich:column>

[nbelaevski]

You can use map to store required data, and then have map key as "data".

[poschd]

Hi,

since I cannot solve this problem using <rich:paint2D> I decided to open a new thread.

Thank you for all your helpful answers and effort.

Best Regards,

Daniel