I have a java program using an external library. The main program uses log4j
to log its messages and the library uses java.util.logging
.
My problem is that log messages from the external library and the main program are mixed in the console.
I would like to redirect all log messages from the external library to a file. I tried to do that with a logging.properties
file:
handlers= java.util.logging.FileHandler
.level= INFO
java.util.logging.FileHandler.pattern = foo.log
java.util.logging.FileHandler.formatter = java.util.logging.XMLFormatter
This file is initialized with:
System.setProperty("java.util.logging.config.file", "logging.properties");
Unfortunately, log messages from the external library keep appearing in the console.
Should I use something like slf4j
to intercept log messages from java.util.logging
?
Thank you for your time.
Here's some code from one of my programs. This also does automatic rotation. The config class is my own that's read from a properties files. You can just replace that with your own values.
Logger rootLogger = Logger.getLogger("");
logHandler = new FileHandler(config.getLogFile(),
config.getLogRotateSize()*1024*1024,
config.getLogRotateCount(), false);
logHandler.setFormatter(new SimpleFormatter());
logHandler.setLevel(Level.INFO);
rootLogger.removeHandler(rootLogger.getHandlers()[0]);
rootLogger.setLevel(Level.INFO);
rootLogger.addHandler(logHandler);
Note this is for a stand-alone program. Any application server has it's own logging configuration tools. The program can also change the formatter and levels on the fly if a dynamic debug mode is desired.
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