Re: lew? 2 qq

I do not know this word "qq".

beelzibub @ bawston school for idiots wrote:
1 why not just catch the error then write it to std.err [sic] so if your
program does dump there is written for you to debug by?

This is a good question. Logging utilities are much more flexible. stderr is just one channel, and not an especially good one for things like Web servers. Everyone writes to the same channel, and the logging overhead to stderr is incurred with every call; that can have an adverse impact on performance. Furthermore, it is inflexible: you have to invent your own formats, disentangle all the output from multiple sources, disentangle important output from less so, and you can't selectively suppress some log output and not other.

With a library such as log4j, you have very good control. You can suppress logging output "below" a certain level of granularity for most stuff most of the time; that means you might log only "SEVERE" or "ERROR" level messages in production. All less critical messages ("WARNING", "DEBUG", etc.) not only are not emitted, they have negligible impact on production performance. Only messages that are emitted cause overhead.

Furthermore, you can have different parts of the system log at different levels. For example, if one web service class is troublesome, you crank up its logging level to DEBUG but leave everyone else ERROR only.

Not only that, you can log each program, each class, even each method to separate outputs should you choose. You can even simultaneously log to multiple outputs, such as the stdout stream and a named log file. You can even log to a database. But wait, there's more. Logging is configurable at deployment time via an external resource file, so you don't even have to hard-code all that control. This includes formatting and built-in handling of multiple threads.

Logging is as superior to System.err output (or, shudder, System.out) as a Ferrari is to a VW.

2 my program runs fine but the spinners(i have 3), when you clik to advance one it goes way up, almost infinite.

Congratulations.

BTW, how close to infinite do you have to get to be "almost" there?

--
Lew
.

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