![]() 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. The default value for this property is false. 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. ![]() The two parameters are %X] is the recommended printing format, which can be customized based on your actual scenario requirements.Log4j2 JSONLayout Properties are used to control the JSON layout logs like: Second, to correctly print the TraceId and SpanId parameters, we also need to configure the extra parameters of PatternLayout in the log configuration file. Private static final Logger logger = LoggerFactory.getLogger(XXX.class) First, the log programming interface in application should be oriented to SLF4J, as follows: / / Introduce interface The corresponding TraceId and SpanId are printed based on SLF4J MDC. Also, it is suggested to use only one log implementation rather than multiple implementations. It is recommended to introduce Logback and Log4j2 instead of Log4j. įor SOFABoot or Spring Boot application, you need to introduce the specific log implementation. That is, the programming interface for printing log does not rely on specific log implementation. ![]() In order to properly print the TraceId and SpanId parameters in the logs of the application, the log programming interface needs to be programmed for SLF4J. This document introduces the SLF4J MDC feature integrated in SOFATracer, which allows you to output the current SOFATracer context TraceId and SpanId with simply modifying the log configuration file. SLF4J provides MDC (Mapped Diagnostic Contexts), which supports you to define and modify log output formats and content. Print traceId And spanId To Application Log ![]()
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