I have a 3rd-party developed big complex application full of java.util.logging.Logger#finer() calls.
Normally I use log4j and sl4j for logging, and I don't know very much of java.util.logging, even less about all the configuration details and possibilities.
Every single google about "java.util.logging" points to a full explanation about streams handlers, formatters, levels. Everyone assumes I really care about all this stuff (it is a reasonable assumption actually). But I couldn't care less.
I'm not really interested in separating logs per file, or file rotation, zipping, email, remote log etc. I'm also not concerned about log level and message formatting thrills.
All I want to do is to run this application with all available log messages spitting to stdout.
Is there an easy simple direct way to do this?
Something like jvmargs -Djava.util.logging.level=FINEST -Djava.util.logging.to=stdout.
Or maybe some simple file dropped into some location in the classpath?
All I want to do is to run this application with all available log messages spitting to stdout
Don't do this in production but it is the fast, easy, hacky way:
Edit the logging.properties file located in java/conf. E.G. /usr/lib/jvm/default-java/conf/logging.properties
That file is setup to attach a ConsoleHandler to the root logger which is what you want to do this. You just need to adjust the levels to see the output. This is a global change so be aware.
Edit that file and:
.level= INFO -> .level=ALLjava.util.logging.ConsoleHandler.level = INFO to java.util.logging.ConsoleHandler.level = ALLThe recommended way:
Most JVMs are not in your control (production/dev server) so you can instead copy that file to a location you own and use the java.util.logging.config.file system property.
E.G. -Djava.util.logging.config.file=/home/myuser/myapp/logging.properties
That way you are free to make changes that are local to your program and not global to the machine.