RE: [flexcoders] Re: Using SpringBeanAdapter instead of FDS

[Valy Sivec]

Jeff, thanks for the info. I was under the impression that Adobe opened the HibernateAdapter code.  Am I wrong?Can you point me where I can find it?Thanks again,ValyJeff Vroom <[EMAIL PROTECTED]> wrote:                                       First off, on the original question about SpringBeanAdapter, if you can use FDS I recommend that you check
 out the Spring Flex Factory on the Adobe component exchange:     http://www.adobe.com/cfusion/exchange/index.cfm#loc=en_us&view=sn610&viewName=Adobe%20Exchange&avm=1     With this component, it
 just takes a few lines of XML to allow a Flex client to call a method on a spring component.       For the hibernate stuff, if you use a remote object to access hibernate you run into the challenges mentioned below when hibernate is using lazy loading of properties.  If however, you use Flex Data Management Services we solve those problems for you.  We also supply the Java source code for the hibernate assembler with FDS so you can see how we got around the lazy loading and “duplicate instance” problems with hibernate.   Basically we fetch all properties in the hibernate object before the session is closed (unless that property is marked
 as lazy in the FDMS configuration in which case only the id of that object must be available).     Jeff             From: [EMAIL PROTECTED]ups.com [mailto:[EMAIL PROTECTED]ups.com] On Behalf Of laidezmon Sent: Wednesday, September 20, 2006 10:18 AM To: [EMAIL PROTECTED]ups.com Subject: [flexcoders] Re: Using SpringBeanAdapter instead of FDS             I am developing an app that uses the remote object tied to a java/spring/hybernate app like you describe. This was a legacy
 app already written with a jsf front end, and for the most part, the flex stuff has gone over the business logic, pretty well. There have been a couple bumps in the road, but that could have something to do with the way I am implementing it. One of the things I have noticed, is you are not able to lazy load your hybernate objects, so an object with one to many or many to many relationships will error out. You must pass back to flex fully completed java objects when it asks for them. Also when you pass an object to flex, then edit it, and pass it back, I was getting hybernate duplicate object errors. The reason for this is that hybernate is still maintaining the instance of that object, and if you make a change to it, based on id, then it considers them as two objects of the same ID. you can either merge the two of them, delete the hybernate instance, or create a new object based off the flex object being passed, then
 set the hybernate object params to the flex object params using the getters and setters.   So its not completely seamless, but it shows some promise. Course I could be doing it totally wrong too. I know this way works but it might not be a best practice. This to me seems an area of flex sorely in need of better documentation. There are no tutorials or walkthroughs of anything beyond simple objects being passed to and from java, and usually not having anything to do with spring and hybernate connections. At least if there are some tutorials on passing complex objects (meaning an object with at least another object embedded in it) back and forth using spring/hybernate in either remote object or dataservices I have not found it and would love to see it.   --- In [EMAIL PROTECTED]ups.com, "dreuimar" <[EMAIL PROTECTED]> wrote: > > Hey everyone, >
  > I'm currently constructing an application that uses DataServices with > the Hibernate Assembler. I wanted to make the business logic > independent of the view (Flex) so that another application I write > with a web frontend (using Spring MVC) can use the same logic that > Flex uses. I was going to do this using Remote Objects with the > SpringBeanAdapter, but I'm worried about losing the ability for data > pushing, managed classes, etc. Can I still maintain many of the > options I had with FDS using the SpringBeanAdapter? >  > Brennan >                        
    
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