How to log

In JDeveloper this MUST be specified in "Java Options" run parameter
-Djava.util.logging.config.file=P:\progetti\Java\Servlets\myLogging.properties

[myLogging.properties]
############################################################
#  	Default Logging Configuration File
#
# You can use a different file by specifying a filename
# with the java.util.logging.config.file system property.  
# For example java -Djava.util.logging.config.file=myfile
############################################################

############################################################
#  	Global properties
############################################################
#LEVELS: INFO, WARNING
# "handlers" specifies a comma separated list of log Handler 
# classes.  These handlers will be installed during VM startup.
# Note that these classes must be on the system classpath.
# By default we only configure a ConsoleHandler, which will only
# show messages at the INFO and above levels.
handlers= java.util.logging.ConsoleHandler

# To also add the FileHandler, use the following line instead.
#handlers= java.util.logging.FileHandler, java.util.logging.ConsoleHandler

# Default global logging level.
# This specifies which kinds of events are logged across
# all loggers.  For any given facility this global level
# can be overriden by a facility specific level
# Note that the ConsoleHandler also has a separate level
# setting to limit messages printed to the console.
.level= INFO

############################################################
# Handler specific properties.
# Describes specific configuration info for Handlers.
############################################################

# default file output is in user's home directory.
java.util.logging.FileHandler.pattern = %h/java%u.log
java.util.logging.FileHandler.limit = 50000
java.util.logging.FileHandler.count = 1
java.util.logging.FileHandler.formatter = java.util.logging.XMLFormatter

# Limit the message that are printed on the console to INFO and above.
java.util.logging.ConsoleHandler.level = FINE
java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter


############################################################
# Facility specific properties.
# Provides extra control for each logger.
############################################################

# For example, set the com.xyz.foo logger to only log SEVERE
# messages:
hobbyModel.server.Servo.level = FINE
hobbyModel.server.SimpleTelnetServo.level = FINE

Place this two files in your classpath,
[commons-logging.properties]
org.apache.commons.logging.Log=org.apache.commons.logging.impl.SimpleLog

[simplelog.properties]
org.apache.commons.logging.simplelog.defaultlog=warn
#trace
#debug
#info
#warn
#error
#fatal

commons-logging-1.1.jar

log4j-1.2.13.jar

Log log = LogFactory.getLog(">");
log.error("Log prova");