Log4J specific levels to specific files - appenders

Question

I am using log4j for one of my projects and I know it is possible to set thresholds for each appender.

My objective is to log only INFO messages into a file and only ERROR messages in another file.

The problem of using threshold's for this is that if i set a appender threshold to INFO and the other to ERROR, when I log an ERROR message, that message goes to both files (appenders).

How can I achieve this?

Thanks in advance

Is this what you want? http://stackoverflow.com/questions/728295/creating-multiple-log-files-of-different-content-with-log4j — donnior, Jan 03 '12 at 17:22

score 6 · Answer 1 · answered Jan 03 '12 at 17:23

6

We use differents logger for different levels using:

log4j.appender.XXXTracking.filter.LevelToMatch=INFO

with the option filter.LevelToMatch you could write the level that you want. This in the log4j.properties

answered Jan 03 '12 at 17:23

jenaiz

547
2
15

score 2 · Accepted Answer · answered Jan 03 '12 at 17:19

2

You'll want to use org.apache.log4j.varia.LevelMatchFilter

<filter class="org.apache.log4j.varia.LevelMatchFilter">
            <param name="LevelToMatch" value="ERROR" />
            <param name="AcceptOnMatch" value="true" />
        </filter>

answered Jan 03 '12 at 17:19

smp7d

4,947
2
26
48

score 0 · Answer 3 · answered Jan 03 '12 at 19:02

Thanks for the response guys,

What i was doing wrong was that I was trying to define the filter on a properties file. Since the use of this is only suported on an XML configuration file, I have changed to an XML file.

To have exactly what I needed I also had to add a DenyAllFilter filter type:

        <filter class="org.apache.log4j.varia.LevelMatchFilter"> 
            <param name="LevelToMatch" value="INFO" /> 
            <param name="AcceptOnMatch" value="true" />                        
        </filter>
        <filter class="org.apache.log4j.varia.DenyAllFilter" />

Thanks for the help guys

Filters are supported in properties file, see javadoc for [PropertyConfigurator](http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/PropertyConfigurator.html). Correct syntax is (notice ID): `log4j.appender.appenderName.filter.ID=fully.qualified.name.of.filter.class log4j.appender.appenderName.filter.ID.option1=value1 log4j.appender.appenderName.filter.ID.optionN=valueN` — rozky, Feb 15 '12 at 11:21

Log4J specific levels to specific files - appenders

3 Answers3