Hi, In a web application I'm trying to create thumbnail images on demand in response to HTTP requests. I thought I'd use Image.resize(...), only it throws No GfxEnv is active Errs.

So after reading the topic Font. width and "No GfxEnv is active" error I tried calling Desktop.bounds before each call to Image.resize().

It seems to work okay for a couple of requests but then they all fail with the same No GfxEnv is active Err. As it occurred to me that I don't know what's going on behind the scenes of Image.resize or Desktop.bounds I thought I'd ask for help!

Given each HTTP request is run in a different Actor, could it be a threading issue? If so, what would be the best way to get round it?

The current implementation of gfx and fwt in a JVM is backed by the SWT. The SWT is essentially a single threaded model, so there is really only thread that access to all the graphics engine. Probably the best way to try and handle is to make a call to Desktop.callAsync which will run your function on the UI thread. But in general accessing all the graphics stuff from HTTP requests can be very messy. I prototyped another version of gfx backed by AWT too, which is still messy but a little better for multi-threading.

Okay thanks, I'll give that a try. I thought threads had something to do with it.