Re: GWT and Hibernate

Juan,

All the issues I ran into were probably solvable. But here is the high level:

-- Since I was using the command pattern I initially returned a list of my parent abstract data object which all data objects inherit from. This created a very large code base, and in fact would get random errors in Dev Mode and alternate behavior compared to what was expected when I deployed. 

-- I do stateless sessions, each call to the server is atomic in nature. This is for scaling reasons, I test with multiple servers and will via scripts rotate a single client session to multiple servers to verify I can scale horizontally. I did not look into why, but Dozzer seemed to have issues with this (I would get persistence errors), my assumption it is caching something on the server.

-- Compile time, drove me nuts. I am impatient. :D

-- I have a fair number of database linkages all defined as lazy. Dozzer by default seemed to instantiate them or I ended up with errors when I serialized them for sending to the client.

Tim 

On Jul 9, 2013, at 10:42 AM, Juan Pablo Gardella <gardellajuanpablo@gmail.com> wrote:

I don't have issues with Dozzer. What kind of problems dou you have?

2013/7/9 Timothy Spear <n614cd@gmail.com>

I looked at Dozzer and ran into to many issues. Since I was going with the command pattern I converted all result sets to a simple <ArrayList<HashMap<String,String>>

For performance reasons, I do cap the amount of data I return. 

Much smaller code base (but does dramatically increase runtime error checking).

Tim

On Jul 9, 2013, at 10:30 AM, Juan Pablo Gardella <gardellajuanpablo@gmail.com> wrote:

I've used "detach solution" using a filter, so it is transparent for you. I put a sample using it: https://groups.google.com/forum/#!topic/google-web-toolkit/fkbowz5-5do

But I prefer using the DTO alternative (I am using Dozzer). As Ed said, perhaps you spent some time in the configuration, but I prefer this alternative instead sending the model. A DTO can adjust better to the UI than an entity. 

Juan

2013/7/9 Ed <post2edbras@gmail.com>

+1 For Karim solution.

I use Dozer now, but it costs a lot of time to put it all together, I even had to patch Dozer :(..

So I would go for the manual solution: you have full control, compose one dto that exists of several other domain objects. 

At the end the manual solution costs you almost the same as the "configuration" solution like I did, and don't forget the Reflection overhead that is certainly impacting your performance.

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