Setting logging level through CLI argument? Java

Question

Quick question,

Looking through these examples which statically assign the logging level of a program

http://www.onjava.com/pub/a/onjava/2002/06/19/log.html?page=2

http://www.vogella.com/articles/Logging/article.html

How can I dynamically set the logging level through an argument when I call my Java application

e.g.

java -jar myprogram.jar FINE

Meaning that instead of this code

 logger.setLevel(Level.INFO);

I could have something like

logger.setLevel(args[0]);

When researching the documentation there doesnt appear to be away to set the log level with a string.

http://docs.oracle.com/javase/6/docs/api/java/util/logging/Level.html

user2030471 · Accepted Answer · 2013-10-31 10:46:30Z

3

You can use builtin method Level.parse(String), which parses a level name string into a Level.

The argument string may consist of either a level name or an integer value.

For example:

"SEVERE"
"INFO"
"1000"

answered Oct 31, 2013 at 10:46

user2030471

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2 Comments

tomaytotomato Over a year ago

Will need to be careful about user input for this but thank you :)

user2030471 Over a year ago

@serupticious User input validation is mandatory no matter how you implement it. Btw, with this you get new levels created when you use integers which do not map to a known Level. You might be able to use this to your advantage.

TeTeT · Accepted Answer · 2013-10-31 10:38:19Z

You could create a Map of String and Level and refer to that:

logger.setLevel(logmap.get(args[0]));

Debojit Saikia · Accepted Answer · 2013-10-31 10:43:48Z

You can use a map to store the Level mappings:

Map<String, Level> levelmap = new HashMap<String, Level>(); levelmap.put("info", Level.INFO);

and then use this map to set the log level:

org.apache.log4j.Logger rootLogger = org.apache.log4j.Logger.getRootLogger(); String level = arg[0]; rootLogger.setLevel(levelmap.get(level));

Christophe Roussy · Accepted Answer · 2013-10-31 10:55:30Z

The Level class is the reference:

 public static final Level INFO = new Level("INFO", 800, defaultBundle);

You could map from a String like "INFO" to some constant like Level.INFO and so on...

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