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问题描述
我在grails 2.3.4中使用slf4jDailyRollingFileAppender。
当我试图使用一个变量作为file参数的一部分时,grails总是当应用程序启动时打印一些错误日志。
但是我的应用程序的日志消息可以按照预期打印到指定的user-event.log中,尽管grails给了我这些错误信息。
以下是我的log4j配置:
log4j = {
//更改日志模式为默认控制台appender:
appenders {
console name:'stdout',layout:pattern(conversionPattern:'%c {2}%m%n')
appender new DailyRollingFileAppender (
name:userEventLog,
file:$ {event.log.dir} /user-event.log,
layout:pattern(conversionPattern:'%m%n' ),
datePattern:'.yyyy_MM_dd,
threshold:org.apache.log4j.Level.INFO
)
}
info userEventLog :app.bean.log.UserEventLog
}
event.log。 dir变量的定义如下:
环境{
development {
// event log dir
event.log.dir =$ {userHome} / workspace / app / logs / event
}
production {
// event log dir
event.log.dir =/ opt / www / app / logs / event
}
}
$ c
$ b $ p
在grails控制台中打印的错误消息是: > |错误log4j:错误配置log4j时发生错误:event
|错误log4j:错误配置log4j时丢失的属性:事件
当我替换$ {event.log .dir}变量与一个字符串路径,例如/ home / app /并重新启动grails,错误信息消失。
使用阅读配置属性。我假设它在设置 log4j
时不能读取配置属性本身,因为它是配置本身的一部分。
导入grails.util.Holders
...
log4j = {
//更改默认控制台appender的日志模式示例:
appenders {
console name:'stdout',layout:pattern(conversionPattern:'%c {2}% m $ n')
appender new DailyRollingFileAppender(
name:userEventLog,
file:$ {Holders.config.event.log.dir} /user-event.log,
layout:pattern(conversionPattern:'%m%n'),
datePattern:'.yyyy_MM_dd,
threshold:org.apache.log4j.Level.INFO
)
}
info userEventLog:app.bean.log.UserEventLog
}
I am using slf4j "DailyRollingFileAppender" in grails 2.3.4.
When i tried to use a variable as part of the "file" parameter, the grails always print some error logs when the app starting.
But my app's log messages can printed into the specified "user-event.log" as expected although grails gives me those error messages.
Below is my log4j configuration:
log4j = {
// Example of changing the log pattern for the default console appender:
appenders {
console name: 'stdout', layout: pattern(conversionPattern: '%c{2} %m%n')
appender new DailyRollingFileAppender(
name: "userEventLog",
file: "${event.log.dir}/user-event.log",
layout: pattern(conversionPattern: '%m%n'),
datePattern: "'.'yyyy_MM_dd",
threshold: org.apache.log4j.Level.INFO
)
}
info userEventLog: "app.bean.log.UserEventLog"
}
The "event.log.dir" variable is defined as below :
environments {
development {
// event log dir
event.log.dir = "${userHome}/workspace/app/logs/event"
}
production {
// event log dir
event.log.dir = "/opt/www/app/logs/event"
}
}
The error messages printed in grails console when app starting are:
| Error log4j:ERROR Property missing when configuring log4j: event
| Error log4j:ERROR Property missing when configuring log4j: event
when i replace the "${event.log.dir}" variable with a string path, for example "/home/app/" and restart grails, the error messages disappear.
解决方案
Use Holders to read config properties. I assume it will not be able to read the config property itself while setting up log4j
as it is part of the config itself.
import grails.util.Holders
...
log4j = {
// Example of changing the log pattern for the default console appender:
appenders {
console name: 'stdout', layout: pattern(conversionPattern: '%c{2} %m%n')
appender new DailyRollingFileAppender(
name: "userEventLog",
file: "${Holders.config.event.log.dir}/user-event.log",
layout: pattern(conversionPattern: '%m%n'),
datePattern: "'.'yyyy_MM_dd",
threshold: org.apache.log4j.Level.INFO
)
}
info userEventLog: "app.bean.log.UserEventLog"
}
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