VM Arguments added in Run Configurations not saved

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Create a app engine java project, for instance, the guestbook sample project.
2. Choose Run As - Run Configurations, in VM Arguments panel, add some 
customised vm arguments, for instance 
-Drdbms.url=jdbc:mysql://localhost:3306/yourdatabase?user=username&password=pass
word
3. Click Apply then Run, it is fine but when running next time, the newly added 
vm arguments are not saved, we have to manually added it via Run Configurations 
every time trying to  run the web application with customised vm arguments.

What is the expected output? What do you see instead?
The newly added vm arguments should be auto-saved so developer doesn't need set 
it every time. I have tried in other project type like regular java project, 
which behave correctly (change saved even Eclipse is restarted). so I believe 
this is an issue specifically related to GAE project run  configuration setup.

What version of the product are you using? On what operating system?
OS: Mac Mountain Lion
Eclipse: Juno 4.2 SR 1
Google Plugin for Eclipse: 3.1.3.v201212122042-rel-r42
Google App Engine Java SDK: 1.7.4

Please provide any additional information below.

Original issue reported on code.google.com by york.ye....@gmail.com on 19 Jan 2013 at 11:29

[GoogleCodeExporter]

I have the same problem in a GWT project
Specs:
Google Plugin for Eclipse: 3.1.3.v201212122042-rel-r42
GWT Version: 2.5
Eclipse Version: 4.2.1
OS: Windows 7

For some reason even if I add the vm arg and then hit apply and run immediately 
it doesn't recognise the vm arg either

Original comment by xavierra...@gmail.com on 20 Feb 2013 at 10:52

[GoogleCodeExporter]

Does anyone know a workaround for this?

Original comment by mfelic...@gmail.com on 29 Jun 2013 at 7:48