Forums

Re: Push via messaging vs pull via polling..
Within an imbedded space pull architectures are considered superior simply because a call for example to query a service layer takes a certain ammount of time and therefore an answer can be arrived at a predictable momemt in time. Also with this load on the service can be calculated in advance, all of it makes a poll architecture better in environments which operates on strict time/load constraints. For interactive applications this can be bad from a user's perspective. Simply because an user may judge system to be slow and un unresponsive while waiting for an answer. — 

Re: Uncatchable error loading image from URL
Those are good questions. Should getImage check for existence first, or is that our responsibility as developers? I can answer the latter question, however. Recall that, when you send an URL request to a server, Java uses the URLConnection class. This abstract class has an InputStream to represent data sent by the server, which is anything that is not a header. However, what happens when an image isn't present? If HTTP is used, an appropriate header is returned (likely 404). But it's well possible the image is read directly from the inputstream, which will simply contain 0 bytes, resulting in an empty image. On the other hand, trying to open a stream to an archive that doesn't exist, or to an archive entry that doesn't exist, is likely to cause an IOException instead, because no stream to such a resource can be made. Rather than returning an empty stream, an exception occurs somewhere during execution. — 

to work with jt harness and java ireless toolkit.
I'm new to java, and I'm setting up a java tck lab environment. I found that to test the midlets, we require a jtharness, me framework,cq3g test suite,javahelp 3.0 and sun java wireless toolkit. Now I don't know how to integrate jtharness with wireless toolkit. so that i can have harness as my server and wtk as my clint end. Or is there any other easy way to set a java tck server .PLs do give me your suggestions, I'm breaking my head with google and my friends to find a soln. —