CODEWITHSUNDEEP
javalogginglog4j
Ross
Ross

Reputation: 9928

Is it possible to change the log level of a package in log4j?

Currently I have a library that is logging certain information as ERROR. If I change my log4j settings like this:

log4j.logger.com.company.theirpackage.foo=OFF

that will completely disable the library's logging altogether. However, what I'd really like is to still see the information, but have it logged at a WARN or INFO level. In other words, when that particular code calls log.error(), I want it to be as if they had called log.warn() or log.info() instead.

Is there a way to do this with log4j?

Upvotes: 4

Views: 1097

Answers (3)

Terlan Abdullayev
Terlan Abdullayev

Reputation: 337

There are multiple ways to do that. I think the easiest way to do that is to use custom Appender.

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="warn">
    <Appenders>
        <Console name="STDOUT" target="SYSTEM_OUT">
            <PatternLayout pattern="console-> %-5p %c{1}:%L - %m%n" />
        </Console>
        <Console name="CUSTOM_ERROR_STDOUT" target="SYSTEM_OUT">
            <PatternLayout pattern="dependent-> %-5p{ERROR=WARN} %c{1}:%L - %m%n" />
        </Console>
    </Appenders>
    <Loggers>
        <!-- Root logger referring to console appender -->
        <Root level="INFO">
            <AppenderRef ref="STDOUT"/>
        </Root>

        <Logger name="com.my.LogTest" level="INFO" additivity="false">
            <AppenderRef ref="CUSTOM_ERROR_STDOUT" />
        </Logger>
    </Loggers>
</Configuration>

Here I convert all the error logs into warning for that specific class com.my.LogTest. You can find more info about Appender Layouts here. It has pattern selector option which allows you to choose different pattern based on your condition.

Upvotes: 0

Confusion
Confusion

Reputation: 16841

I think this is possible, by implementing a Filter, in which the level inside a LoggingEvent is changed when it matches certain conditions.

Upvotes: 1

Jeff Storey
Jeff Storey

Reputation: 57192

Not directly, but you could write a custom appender that intercepts the calls, checks the levels, and then prints them at whatever level you want. Or, you could do some aspect oriented programming and intercept/change their calls.

But why would you want to change the level they log it at?

Upvotes: 2

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