LOG4J configuration (Detailed version) ———— detailed log is the way to solve the bug

The only jar package you need is: Log4j-1.2.x.jar

I'm currently using Log4j-1.2.17.jar for so long everything is OK, log information is available

Configuration file Log4j.properties

# log4j Settings for log4j 1.2.x (via Jakarta-commons-logging) # # of five logging levels used by Log is (in order): # 1 . DEBUG (The Least serious) # 2. info# 3. warn# 4. error# 5. FATAL (the most serious) # [level], appenderName1, appendername2# Set root logger level, log output destination, log output destination # General Date output most Good set at WARN and higher, or tomcat boot slow and log content too miscellaneous Log4j.rootlogger=warn, Console, r# log output Path Log_home=/data/logs/com/wenniuwuren # Console---------------------------------------------------# Log Output Destination # Consoleappender (console) # Fileappender (file) # Dailyrollingfileappender (Generate a log file per day) # Rollingfileappender (a new file is generated when the file size reaches the specified size) # Writeappender (send log information in stream format to any specified place) # Jdbcappender (save log information to the database) log4j.appender.console= org.apache.log4j.consoleappender# Log Layout # htmllayout (layout as HTML table) # Simplelayout (level and information string containing log information) # Ttcclayout (contains information such as time, thread, category, etc.) # Patternlayout (can be flexibly assigned layout format, commonly used) log4j.appender.console.layout= org.apache.log4j.patternlayout# output Format #%c output log information The full name of the class that belongs to #%d the date or time of the output log point in time, the default format is ISO8601, or the format can be specified later, such as:%D{YYY-M-DD HH:MM:SS}, output similar to: 2002-10-18-22:10:28#%f the class name of the class to which the output log information belongs #%l the occurrence of the output log event where the statement that outputs the log information is in the number of lines of the class where it resides #%m the information specified in the output code, such as log ( Message), the message#%n outputs a carriage return newline character, the Windows platform is "RN", and the UNIX platform is "n" #%p output priority, i.e. debug,info,warn,error,fatal. If the debug () output is called, Debug, and so on #%r output the number of milliseconds that the application starts to output this log information #%t Output the thread name that generated the log event log4j.appender.console.layout.conversionpattern=%d [%t]%-5p [%c]-%m%nlog4j.appender.debug= org.apache.log4j.consoleappenderlog4j.appender.debug.layout= org.apache.log4j.patternlayoutlog4j.appender.debug.layout.conversionpattern=%d [%t]%-5p [%c]-%m%n# Console---------------------------------------------------log4j.logger.java.sql.resultset= Debuglog4j.logger.org.apache=warnlog4j.logger.java.sql.connection=debug log4j.logger.java.sql.statement= debuglog4j.logger.java.sql.preparedstatement=debuglog4j.logger.org.springframework= warnlog4j.logger.org.apache.activemq=warn# R------------------------------------------------------------------- ------------LOG4J.APPENDER.R=ORG.APACHE.LOG4J.ROLLINGFILEAPPENDERLOG4J.APpender. r.layout=org.apache.log4j.patternlayout# output Format LOG4J.APPENDER.R.LAYOUT.CONVERSIONPATTERN=[%D{YYYYMMDD HH:mm:ss}-%p ][%f:%l][%t]--%m%n# Log output path and log file name log4j.appender.r.file=${log_home}/wenniuwuren-system.log# Single log file maximum capacity log4j.appender.r.maxfilesize=1024kb# maximum number of backup files log4j.appender.r.maxbackupindex=10# R-------------------- -----------------------------------------------------------log4j.appender.stdout= org.apache.log4j.consoleappenderlog4j.appender.stdout.layout= org.apache.log4j.patternlayoutlog4j.appender.stdout.layout.conversionpattern=%d%p [%c]-<%m>% Nlog4j.logger.org.apache.ibatis=debuglog4j.logger.java.sql=debug

If it is a Web application, it also needs to be configured in XML (so that Tomcat loads the log4j when it is loaded):

<context-param><param-name>log4jconfiglocation</param-name><param-value>classpath: Log4j.properties</param-value></context-param><listener><listener-class> Org.springframework.web.util.log4jconfiglistener</listener-class></listener>

LOG4J configuration (Detailed version) ———— detailed log is the way to solve the bug