What is log4j level trace?

Designates very severe error events that will presumably lead the application to abort. OFF. The highest possible rank and is intended to turn off logging. TRACE. Designates finer-grained informational events than the DEBUG.

What is the default logging level in SLF4J?

slf4j. simpleLogger. defaultLogLevel – Default log level for all instances of SimpleLogger. Must be one of (“trace”, “debug”, “info”, “warn”, “error” or “off”).

Can we use log4j and SLF4J together?

So essentially, SLF4J does not replace log4j; they both work together. It removes the dependency on log4j from your application and makes it easy to replace it in the future with the more capable library.

What is difference between log4j and SLF4J?

Unlike log4j, SLF4J (Simple Logging Facade for Java) is not an implementation of logging framework, it is an abstraction for all those logging frameworks in Java similar to log4J. Therefore, you cannot compare both. However, it is always difficult to prefer one between the two.

What are the three most important components of log4j?

log4j has three main components:

  • loggers: Responsible for capturing logging information.
  • appenders: Responsible for publishing logging information to various preferred destinations.
  • layouts: Responsible for formatting logging information in different styles.

Is slf4j affected by log4j vulnerability?

The SLF4J API is just an API which lets message data go through. As such, using log4j 2. x, even via SLF4J does not mitigate the vulnerability.

What is the log output level?

What Is a Logging Level. A log level or log severity is a piece of information telling how important a given log message is. It is a simple, yet very powerful way of distinguishing log events from each other. If the log levels are used properly in your application all you need is to look at the severity first.

Is SLF4J vulnerable to log4j?

Can SLF4J work without log4j?

Conclusion. So essentially, SLF4J does not replace Log4j, Both work together. SLF4j removes the tight coupling between the application and logging frameworks. It makes it easy to replace with any other logging framework in the future with a more capable library.

Is log4j over SLF4J vulnerable?

Thus, if your SLF4J provider/binding is slf4j-log4j12. jar, you are safe regarding CVE-2021-44228. If you are using log4j-over-slf4j. jar in conjunction with the SLF4J API, you are safe unless the underlying implementation is log4j 2.