Tutorial Form Issue : ConcurrentModificationException on commit

Vaadin 6 / 7 / 8 Framework Data Binding
1

Hy all of you,

I’m following this tuto https://vaadin.com/tutorial/-/chapter/interaction.form.html.

As I want to save, I have a ConcurrentModificationException issue.
I’ve checked to pass the app, to setWriteThrough(false) and other stuff.

Unfortunately I have the following issue :


| Error 2012-02-22 10:49:23,581 ["http-bio-8080"-exec-3]
 ERROR vaadin.Application  - Terminal error:
Message: null
    Line | Method
->>  532 | receiveEvent        in com.vaadin.event.ListenerMethod
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|    164 | fireEvent           in com.vaadin.event.EventRouter
|   1219 | fireEvent . . . . . in com.vaadin.ui.AbstractComponent
|    550 | fireClick           in com.vaadin.ui.Button
|    217 | changeVariables . . in     ''
|   1451 | changeVariables     in com.vaadin.terminal.gwt.server.AbstractCommunicationManager
|   1399 | handleVariableBurst in     ''
|   1318 | handleVariables     in     ''
|    763 | doHandleUidlRequest in     ''
|    296 | handleUidlRequest   in com.vaadin.terminal.gwt.server.CommunicationManager
|    501 | service . . . . . . in com.vaadin.terminal.gwt.server.AbstractApplicationServlet
|    193 | service             in com.vaadin.grails.terminal.gwt.server.GrailsAwareApplicationServlet
|    886 | runTask . . . . . . in java.util.concurrent.ThreadPoolExecutor$Worker
|    908 | run                 in     ''
^    662 | run . . . . . . . . in java.lang.Thread

Caused by ConcurrentModificationException: null
->>  761 | checkForComodification in java.util.LinkedList$ListItr
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|    696 | next                in     ''
|    336 | commit . . . . . .  in com.vaadin.ui.Form
|     89 | buttonClick         in org.electionpro.ui.customer.CustomerForm$$ENPeII3k
|    512 | receiveEvent . . .  in com.vaadin.event.ListenerMethod
|    164 | fireEvent           in com.vaadin.event.EventRouter
|   1219 | fireEvent . . . . . in com.vaadin.ui.AbstractComponent
|    550 | fireClick           in com.vaadin.ui.Button
|    217 | changeVariables . . in     ''
|   1451 | changeVariables     in com.vaadin.terminal.gwt.server.AbstractCommunicationManager
|   1399 | handleVariableBurst in     ''
|   1318 | handleVariables     in     ''
|    763 | doHandleUidlRequest in     ''
|    296 | handleUidlRequest   in com.vaadin.terminal.gwt.server.CommunicationManager
|    501 | service . . . . . . in com.vaadin.terminal.gwt.server.AbstractApplicationServlet
|    193 | service             in com.vaadin.grails.terminal.gwt.server.GrailsAwareApplicationServlet
|    886 | runTask . . . . . . in java.util.concurrent.ThreadPoolExecutor$Worker
|    908 | run                 in     ''
^    662 | run . . . . . . . . in java.lang.Thread

I tried to syncrhonized the code in the ButtonEvent,

I also tried to set final the application in the class since the commit is in an event.

Thanks for your help

2

Well,

I forgot to precise some little points. I made additionnal tests :

  • I’m working with grails 2.x and its latest vaadin plugins
  • I downloaded the entire tutorial project and put it in a grails projest and the commit aspect is working well

My problem is probably coming from the persistance aspect.
In the project I’m working on, the datas are stored and the model is designed by groovy domain classes.
When I create a new instance and make save, it appears in the list but not in the database. In an another part, when I make a save, no changes appears in the list above.
Should I override the commit() method in order ta handle the groovy aspects?

regards

3

Maybe,

The getBean method available in the grails plugin could be a worlaround? http://grails.org/plugin/vaadin

4

Well,

I made ssome additionnal tests : https://vaadin.com/forum/-/message_boards/view_message/54053#_19_message_1165769

The “persist” aspect doesn’t seems to be well configured in my project.

Thanks in advance for your help.

regards