You have seen logging levels in log4j they have optimized number of java logging level and each of them fully describes what it does. Another flexibility of log4j is that you can change logging level of your java application without restarting your java application, by the way this you can do in java.util.logging API by using JMX if you have implemented that.
Log4j also provides flexibility to set logging level based on per class in its configuration file log4j.xml. You can either use log4j.properties file or log4j.xml for configuring java logging in your application while using log4j for logging in java. Also log4j is thread-safe. Log4j components are designed to be used in heavily multithreaded systems. On the other hand Formatter and Appender facility of java.util.logging API quite useful especially Formatter allows you to format java logging output as you want for logging in Java.
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