tomcat8-war-runner/src/main/java/org/apache/tomcat/maven/runner/Tomcat8Runner.java [759:790]:
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    private void installLogger( String loggerName )
        throws SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException,
        InvocationTargetException
    {
        if ( "slf4j".equals( loggerName ) )
        {

            try
            {
                // Check class is available

                //final Class<?> clazz = Class.forName( "org.slf4j.bridge.SLF4JBridgeHandler" );
                final Class<?> clazz =
                    Thread.currentThread().getContextClassLoader().loadClass( "org.slf4j.bridge.SLF4JBridgeHandler" );

                // Remove all JUL handlers
                java.util.logging.LogManager.getLogManager().reset();

                // Install slf4j bridge handler
                final Method method = clazz.getMethod( "install", null );
                method.invoke( null );
            }
            catch ( ClassNotFoundException e )
            {
                System.out.println( "WARNING: issue configuring slf4j jul bridge, skip it" );
            }
        }
        else
        {
            System.out.println( "WARNING: loggerName " + loggerName + " not supported, skip it" );
        }
    }
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tomcat7-war-runner/src/main/java/org/apache/tomcat/maven/runner/Tomcat7Runner.java [815:846]:
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    private void installLogger( String loggerName )
        throws SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException,
        InvocationTargetException
    {
        if ( "slf4j".equals( loggerName ) )
        {

            try
            {
                // Check class is available

                //final Class<?> clazz = Class.forName( "org.slf4j.bridge.SLF4JBridgeHandler" );
                final Class<?> clazz =
                    Thread.currentThread().getContextClassLoader().loadClass( "org.slf4j.bridge.SLF4JBridgeHandler" );

                // Remove all JUL handlers
                java.util.logging.LogManager.getLogManager().reset();

                // Install slf4j bridge handler
                final Method method = clazz.getMethod( "install", null );
                method.invoke( null );
            }
            catch ( ClassNotFoundException e )
            {
                System.out.println( "WARNING: issue configuring slf4j jul bridge, skip it" );
            }
        }
        else
        {
            System.out.println( "WARNING: loggerName " + loggerName + " not supported, skip it" );
        }
    }
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