Admin: Logging - HiromuHota/pentaho-kettle GitHub Wiki

PDI uses a central logging buffer and writes to the logging backend (Apache Log4j). In addition to Log4j, webSpoon uses java.util.logging (JUL) because Tomcat uses it by default. The table below shows the mapping between log file, logging framework, logger, etc.

Log file location	Logging framework	Logger	What is logged	Configuration file
logs/catalina.out	JUL	*	Tomcat + Stdout/err	conf/logging.properties
logs/pdi.log	Log4j	org.pentaho.di	Jobs/Transformations	plugins/kettle5-log4j-plugin/log4j.xml
logs/spoon.log	Log4j	*	Other user actions	webapps/spoon/WEB-INF/classes/log4j.xml

You may find some log lines that do not follow this rule. Please report it then I'll fix it.