Log4j Custom Appender

Posted By admin On 01.06.20

In log4j2, you would create a plugin for create custom appender in log4j2. When you annotate your custom Appender class with @Plugin(name=”MyCustomAppender”, category=”core” elementType=”appender”,printObject=true) the plugin name becomes the configuration element name, so a configuration with your custom appender would then look like this. I had a recent task where I wanted to log events in a section of our code to our content management system. I leveraged log4net, created a custom appender, and was logging successfully in no time. I used this detailed tutorial to get a better grasp on log4net and I would consider reading it a.

Log4j Custom Appender Spring
Log4j Custom Appender Properties
Log4j Custom Appender Pattern

Active4 years, 11 months ago

My class code is as below.

And my configuration of log4j.properties are as follows.

This is creating a log for different types, for example, DEBUG, ERROR, and INFO in different log files. But what limitation is it? It is creating larger and larger log files. I want to make log files for, say, of 5 MB, and previous logs should be removed. How can I do that? When I try with RollingFile Appender, I get the below log files only.

Rolling of log files ERROR,DEBUG is not done, but INFO is done.

ProgramFOX

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Log4j Custom Appender Spring

Bhavik AmbaniBhavik Ambani

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1 Answer

I suggest you derive from RollingFileAppender instead of FileAppender. This will give you the possibility to define how large the log-files will grow, and how many 'old' ones you want to keep. Check out the manual on how to use it later in your log4j.propertiers.

If I understand correctly, you want one file per log-level, is that correct? If so, I suggest you follow this FAQ-Entry rather than 'rolling' your own solution :)

Peter Mortensen

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quaylarquaylar

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19 Jun 2012CPOL

A brief example of how to create and implement a custom log4net appender

Introduction

Log4j Custom Appender Properties

I had a recent task where I wanted to log events in a section of our code to our content management system. I leveraged log4net, created a custom appender, and was logging successfully in no time.

I used this detailed tutorial to get a better grasp on log4net and I would consider reading it a prerequisite before going through this article. Custom appenders were out of scope of that article so I thought I'd try to give an example here.

Using the code

Here are the portions of my web.config with the log4net definitions. As you can see, I have a logger node which instructs that all code in the ACM.Certification namespace will use the ACMAppender appender for logging with the minimum logging level of INFO. Above the logger node, I have my appender definition node which identifies the type (ACM.ACMAppender) used for the appender.

Here is my ACMAppender class which simply implements the abstract class AppenderSkeleton. It also uses the RenderLoggingEvent() helper method which renders the logging event as a string using the ConversionPattern defined in the web.config above. The LogService object is the custom logging class for my content management system. You would replace the contents of the <code>Append() method with whatever custom logging you'd want for your implementation.

And here is an example of how it's used in my code. After instantiating an ILog object, logging is as simple as calling the Error() (or whatever type of log you want to record) method on the object.

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Hope this helps!