Thread: SLF4J with java.util.logging - How to set log into files

Originally Posted by amit1983

I'm using SLF4J with java.util.logging (I add slf4j-jdk14-1.7.5.jar file into the path).

SLF4J is only a logging "facade", in other words it's an abstraction layer for other real logging frameworks (log4j, java.util.logging, etc...). So SLF4J itself has no configuration. The configuration is for the real logging library/framework.
Since you have picked the java.util.logging, you should see its reference documentation, that is here:

http://docs.oracle.com/javase/7/docs...ing/index.html

Originally Posted by amit1983

1. I can see "INFO: Hello World 1" only , and cant see the "Debug TEST" line.
why ?

There is a default configuration file in your JRE, it's named logging.properties and you can find it under the "lib" directory of your JRE (for example the private JRE of the JDK, eg. .../jdk1.7.0_xx/jre/lib ).

You will find the rows:
.level= INFO
java.util.logging.ConsoleHandler.level = INFO

This means that the minimum level logged is INFO (globally but also specifically for ConsoleHandler). Note that java.util.logging does not have the "DEBUG" name, there are other names. SLF4J "maps" debug() to FINE (see javadoc of org.slf4j.impl.JDK14LoggerAdapter). And FINE has less priority than INFO, so with default configuration, debug() is not logged.

Originally Posted by amit1983

2. I want to log into files and not into the console

Again, the default configuration file of java.util.logging contains:
handlers= java.util.logging.ConsoleHandler


Solution: understand how java.util.logging can be configured and write your configuration file.