![]() ![]() The default value for this property is false. If we want the exception stack trace as a string and not as a nested object, then we can use this property. The above exception is printed in that Java code. "name" : "",Īt the end of this tutorial, we have provided the Java class and XML configuration using which you can setup the project and try using all these properties. But when we set this property to true( by default this property is true), then we get a thrown field and an extendedStackTrace field extra in JSON log which has all the details about the exception, holding the complete stacktrace.įor example, the error log will look like this: If this property is set as false, if any exception occurs you will see a thrown field with some information about the exception in the JSON log. includeStacktraceĪs the name suggests, if you want to include the complete stack trace for exception in your logs, then you should set this flag as true. ![]() If you set this property as true, the logging process can slow down a bit. If you want to add the location info to the log appender so that it gets printed with each log event, then we can set this property as true. Similarly, you can provide any thing like \t too for using it as the end-of-line character. We can use this property to provide a character which will be used as the end-of-line character if the eventEOL is set as true.įor example, if we set eventEol=true and compact=true to have one record per line, the default end of line character is \r\n, but we can use the endOfLine property and set it to \n, then \n will be used as the end-of-line character. The above configuration is a good configuration, to keep the logs in readable form, with each log event printed in new line and in compact form too, hence reducing the file size in which logs are stored. We can use this property with value set as true and compact=true to get one record per line, which will make the JSON logs more readable. This property takes a boolean value and the default value is false. This property is used to add an end-of-line character, which is \r\n characters after each log event. If you just want to print logs in JSON to stream them into Elasticsearch using some log aggregator service like Fluent Bit, then you should ignore this property. You can find all the accepted charset values here on Oracle's website. This property is used to specify the character set which is used when converting the logs to a byte array. If we set this value as true, then open array character or square brackets are added at the beginning and end of the logs printed, which means the log starts with is added and comma ( ,) is added after every log event printed. If we set this property as true, we get a well formatted JSON in logs. Here is a sample XML configuration example: Also if you are using any log aggregator service like Fluentd or Fluent bit, then having this property as true will put extra load while loading the log from log file as there is no end of line character, and hence the complete log file is treated as a single line. This property helps in saving space in log files, but makes the logs less readable. When we set this property to true, then no new line character is added at the end of the JSON log string and no indentation is done, due to which the log will appear as one single line. So let's take a look at all the available properties. Log4j2 provides many properties to control the JSON Layout which can be used to configure the JSON format of the logs. So don't get confused, thinking some log event is getting generated when I mention log event while explaining the properties below, it simply means a log line which is printed. Yes, be it in INFO mode, or DEBUG mode, when you use the logger in your Java code to print some log, it is called as a log event. Well, in Log4j2 world, each log statement printed is called as log event. What is Log Event?īefore we dive into the properties its important to understand what a log event refers too. We have already covered a separate tutorial to setup Log4j2 with JSONLayout logging. Whether or not include the thread context map in the JSON generated for logs. Including timestamp for the log in milliseconds or not. Whether or not include the complete stacktrace for exceptions in your application in the log events. ![]() Have a new line character at the end of the JSON string or have proper indentation or not to make the logs more readable. Log4j2 JSONLayout Properties are used to control the JSON layout logs like:
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