I currently have the below pattern layout in log4j. I want to add the Process id to the log file. How can I do it?
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=%d [%t] %-5p %c - %m%n
Pasted sample log message
2011-01-07 11:48:21,940 [main] INFO Testing1
2011-01-07 11:48:21,942 [main] INFO Test.common.ApplicationProperties - Used log4j
log4j.properties
"log4j.properties" [Read only] 26 lines, 884 characters
log4j.rootCategory=DEBUG, stdout, A1
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Threshold=WARN
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy/MM/dd HH:mm:ss} %-5p (%c) %m%n
log4j.appender.A1=org.apache.log4j.RollingFileAppender
log4j.appender.A1.Threshold=DEBUG
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=%d [%t] %-5p %c - %m%n
log4j.appender.A1.File=/homw/cus/logs/ccl.02.log
log4j.appender.A1.MaxFileSize=5MB
log4j.appender.A1.MaxBackupIndex=40
log4j.category.test.common.DBConnectionPool=WARN
log4j.category.test.common.DataBaseHandler=WARN
log4j.category.test.cttg.tables=WARN
log4j.category.test.middleware.tables=WARN
log4j.logger.org.apache.axis=ERROR
log4j.logger.org.apache.catalina=ERROR
You should use MDC to do it
In the config file :
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy/MM/dd HH:mm:ss} %-5p (%c) %m%n %X{PID}
%X{PID} is used to match the context value PID
And then, in the code, before the logging begins :
log4j 1.x
RuntimeMXBean rt = ManagementFactory.getRuntimeMXBean();
String pid = rt.getName();
MDC.put("PID", pid);
log4j 2.x
RuntimeMXBean rt = ManagementFactory.getRuntimeMXBean();
String pid = rt.getName();
ThreadContext.put("PID", pid);
Teja Kantamneni
Alexcocia
With the following pattern, showing threadID and class. If you want to see the Process ID, might check here
log4j.appender.SYSLOG.layout.conversionPattern=%-5p %d{ddMMyyyy HH:mm:ss.SSS} [%t:%c] %m%n
I managed to do so, but I have several appenders, one for each part of the application, like the following:
log4j.rootCategory=ERROR, SYSLOG2
log4j.logger.com.myself.logic=DEBUG, SYSLOG
log4j.logger.com.myself.database=DEBUG, SYSLOG3
log4j.logger.com.myself.other=DEBUG, SYSLOG
Here are some examples of generated logs, to check if this is what you require:
INFO 20012015 11:56:17.318 [pool-1-thread-1:com.myself.logic.MonitoringTask] 10602: Validation of orders before UTC=2015-01-20T16:56:17
INFO 20012015 11:56:34.200 [main:com.gmv.pazgs.mus.mpu.CLibWrapper] 10402: MPU Library folder: xxxxx
INFO 20012015 11:56:34.209 [main:com.gmv.pazgs.mus.mpu.CLibWrapper] 10402: MPU Configuration folder: xxxxx
INFO 20012015 11:56:34.773 [main:com.gmv.pazgs.mus.mpu.CLibWrapper] 10402: Calling InitLeap()
INFO 20012015 11:56:34.786 [main:com.gmv.pazgs.mus.mpu.CLibWrapper] 10402: Calling InitFourier()
INFO 20012015 11:57:10.151 [CRON_Thread:com.myself.other.DTOLDispatcher] 10202: Times to send: [11:00, 23:00] - current time = Tue Jan 20 11:57:10 UTC 2015
INFO 20012015 11:58:10.165 [pool-1-thread-4:com.myself.logic.MonitoringTask] 10602: Executing Monitoring Task UTC=2015-01-20T11:58:10
INFO 20012015 11:58:10.171 [pool-1-thread-5:com.myself.logic.OrderValidationTask] 10602: Executing OrderValidationTask UTC=2015-01-20T11:58:10
INFO 20012015 11:58:10.291 [CRON_Thread:com.myself.other.DTOLDispatcher] 10202: Times to send: [11:00, 23:00] - current time = Tue Jan 20 11:58:10 UTC 2015
INFO 20012015 11:58:10.684 [pool-1-thread-4:com.myself.logic.MonitoringTask] 10602: Expiration of orders before UTC=2015-01-20T11:58:10
INFO 20012015 11:58:11.218 [pool-1-thread-4:com.myself.logic.MonitoringTask] 10602: checking orders for suppresed status before UTC=2015-01-20T11:58:11
INFO 20012015 11:58:11.244 [pool-1-thread-4:com.myself.logic.MonitoringTask] 10602: Validation of orders before UTC=2015-01-20T16:58:11
来源：https://stackoverflow.com/questions/4622252/how-to-add-the-process-id-to-a-log4j-log-file