SLF4 is a logging facade. The name says it all. It is not a logging component and it does not do the actual logging. It is only an abstraction layer to an underlying logging component. In the case of Log4j, it is a logging component and it does the logging instructed to do. Logically these are entirely two different things.
So what would be the right question. Do I need an abstraction logging layer in my project. Artificial Intelligence. Cloud Computing. Data Science. Angular 7. Machine Learning. Data Structures. Operating System. Computer Network. Compiler Design. Computer Organization.
Discrete Mathematics. Ethical Hacking. Computer Graphics. Software Engineering. Log4J: It is a logging framework i. The loggings can be categorized into various levels like trace, debug, info, error, fatal and several other modes. These loggings details are sharable to different platforms like other databases and file consoles.
They also hold every kind of interaction details that a user had with the system either be transaction detail, information or also if something goes wrong I mean to say if the particular activity does not perform the execution.
WHY — we need to track the issues, statements regarding loading of functions, the type of parameters we have passed, warning messages or notifications to better understand the application in the development phase and can also be used for future reference.
Ssl4j is just an abstraction or it provides an abstraction layer and we are not using it whereas Log4j is a logging framework that has different implementations. Talking of the components within this two Sl4j does not have any components as such it has a list of implementations like logback or NOPloggers and several others whereas in case of log4j it has 3 main components within namely —.
Talking of preferences we would like to say there is no direct comparison between ssl4j and log4j but there can be preferences based on particular situations and when to use either of them, follows below the list —. Slf4j can be configured to use Log4j as a logging backend for working together but the later conversion of not possible.
Learn more. Difference between slf4j and log4j on the basis of String creation Ask Question. Asked 8 years, 1 month ago. Active 4 years, 1 month ago. Viewed 33k times. Improve this question. Add a comment. Active Oldest Votes. Improve this answer. I think Java 8. Delconis There is no "but" here, the answer is still very much true. Just how the strings are concatenated does not matter, every time the logger is called, its parameter is evaluated, the strings concatenated and some small amount of work performed.
No concatenation ever happens, not even using comparatively quick StringBuilder. If you have tons of trace level debugging, it makes a big difference. I would say to increase performance by reducing String concatenations. Community Bot 1 1 1 silver badge.
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