Java Logging:log Levels

Table of Contents

• Filtering Messages

When a-message is logged via a Logger it's logged with a certain log level. The built-in log levels is:

• SEVERE
• WARNING
• INFO
• CONFIG
• FINE
• Finer
• FINEST

The log level was represented by the class java.util.logging.Level . This class contains a constant for each of the above log levels. It is one of the these constants you use when you log a message to a Logger . Here are an example:

Logger.log (level.severe, "A SEVERE message!");

Filtering Messages

You can filter the messages by their log level, meaning you can configure a to not Logger log, and not propagate messages B Elow a certain level. Here is a example of that:

Logger.setlevel (level.warning);

The now Logger ignores all messages below the log level WARNING .

To understand how log levels behave Logger in the hierarchy, check out the text on the Logger hierarchy.

Java Logging:log Levels