Victor Mote wrote: > OK, here is a related question that does not appear to be an FAQ (per my > review of FOP, Batik, and Cocoon lists). If I try: > ge = GraphicsEnvironment.getLocalGraphicsEnvironment(); > > in a headless environment, I get a runtime error that halts the JVM.
This is interesting, but you'll probably get more and better answers on comp.lang.java or a more specialized Java forum. > There > does not seem to be a way to catch the error and skip the offending code > (which is all I really need to do). It looks like 1.4 will throw a > HeadlessException, and also gives a GraphicsEnvironment.isHeadless() method, > both of which are helpful. However, in 1.3, I don't see a clean way to > detect this -- I could probably do something klunky like looking at the > $TERM variable & trying to figure it out from there. I'd go for the DISPLAY environment variable: if it's not set, you are most probably running headless. There is a slight possibility you are on a system which would connect to a local X server anyway, so just to be really, really sure open a socket to localhost:6000, and perhaps emulate XOpenDisplay if there is something listening there. I'm not sure why you take this trouble, can't you control or at least reliably determine the run time environment in advance? You can install PJA in case you encounter a headless Java 1.3 environment. > On a related note, what are our criteria > for determining support of various Java platforms? There is a rule of thumb to support older environments up to two years after the next major upgrade was available, perhaps with slight restrictions. It depends on how much inconvenience this brings to users of more recent versions, and on how much users of older versions complain. There are people stuck with MS Java or IMB's 1.1.8 JRE on OS/390 USS, but they never showed up in person when it came to discussions about dropping Java 1.1 support. J.Pietschmann --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, email: [EMAIL PROTECTED]
