How to prevent logback from outputting its own status at the start of every log when using a layout

user_19479 0
Viewed 66557

This seems like a carelessness error, but I can't seem to find the cause. Logging with logback/slf4j (most recent version slf4j-api-1.6.1, logback core/classic 0.9.24). Simplest log configuration for testing is:

<configuration>
 <appender name="stdout" class="ch.qos.logback.core.ConsoleAppender">
  <layout class="ch.qos.logback.classic.PatternLayout">
   <!-- DONT USE THIS FORMATTER FOR LIVE LOGGING THE %L LINE NUMBER OUTPUTTER IS SLOW -->
   <pattern>%le %-1r [%c{1}:%L] %m%n</pattern>
  </layout>
 </appender>
 <root level="DEBUG">
  <appender-ref ref="stdout" />
 </root>
</configuration>

Every log setup starts with logback's internal status lines:

11:21:27,825 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback.groovy]
11:21:27,826 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Found resource [logback-test.xml] at [file:.../logback-test.xml]
11:21:28,116 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - debug attribute not set
11:21:28,124 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.ConsoleAppender]
11:21:28,129 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [stdout]
11:21:28,180 |-INFO in ch.qos.logback.core.joran.action.NestedComplexPropertyIA - Pushing component [layout] on top of the object stack.
11:21:28,206 |-WARN in ch.qos.logback.core.ConsoleAppender[stdout] - This appender no longer admits a layout as a sub-component, set an encoder instead.
11:21:28,206 |-WARN in ch.qos.logback.core.ConsoleAppender[stdout] - To ensure compatibility, wrapping your layout in LayoutWrappingEncoder.
11:21:28,206 |-WARN in ch.qos.logback.core.ConsoleAppender[stdout] - See also http://logback.qos.ch/codes.html#layoutInsteadOfEncoder for details
11:21:28,207 |-INFO in ch.qos.logback.classic.joran.action.RootLoggerAction - Setting level of ROOT logger to DEBUG
11:21:28,207 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [stdout] to Logger[ROOT]

which is, according to the docs, the format logback uses for default. It then finishes reading the config (which is set up to output a different format) and continues with the properly formatted output. There's a config parameter <configuration debug="false"> which does not affect this.

Anyone know how to shut this off?

logback
10 Answers

I had the same problem i added this line 

        <!-- Stop output INFO at start -->
        <statusListener class="ch.qos.logback.core.status.NopStatusListener" />

in the logback and it succefully worked

user_128379240

I prefer to use status listener in order to switch off own logback logs:

<configuration>
  <statusListener class="ch.qos.logback.core.status.NopStatusListener" />
  ...
</configuration>

But as was mentioned NopStatusListener also prevents showing warning and errors. So you can write your custom status listener and change log level for it manually:

package com.your.package;

import ch.qos.logback.core.status.OnConsoleStatusListener;
import ch.qos.logback.core.status.Status;

import java.util.List;

public class PrintOnlyWarningLogbackStatusListener extends OnConsoleStatusListener {

    private static final int LOG_LEVEL = Status.WARN;

    @Override
    public void addStatusEvent(Status status) {
        if (status.getLevel() == LOG_LEVEL) {
            super.addStatusEvent(status);
        }
    }

    @Override
    public void start() {
        final List<Status> statuses = context.getStatusManager().getCopyOfStatusList();
        for (Status status : statuses) {
            if (status.getLevel() == LOG_LEVEL) {
                super.start();
            }
        }
    }

}

Then use it in your logback.xml file: 

<configuration>
  <statusListener class="com.your.package.PrintOnlyWarningLogbackStatusListener" />
  ...
</configuration>
user_71795090
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