Spring boot Slf4j : Some logs when starting are displayed in red but they are not error

Question

I have a small Spring boot project. This project used Log4j before but I'm swaping to slf4j. With both log system I have something that I don't understand when I start my application :

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v2.6.4)

2022-08-10 13:50:15.822  INFO 9136 --- [           main] c.a.SVSApplication                       : Starting SVSApplication using Java 17.0.4 on L10729 with PID 9136 (C:\WorkSpace\SVS2\back\target\classes started by bjulliot001 in C:\WorkSpace\SVS2)
2022-08-10 13:50:15.834  INFO 9136 --- [           main] c.a.SVSApplication                       : No active profile set, falling back to 1 default profile: "default"
2022-08-10 13:50:17.281  INFO 9136 --- [           main] o.s.b.w.e.t.TomcatWebServer              : Tomcat initialized with port(s): 8081 (http)
août 10, 2022 1:50:17 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-nio-127.0.0.1-8081"]
août 10, 2022 1:50:17 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service [Tomcat]
août 10, 2022 1:50:17 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet engine: [Apache Tomcat/9.0.58]
août 10, 2022 1:50:17 PM org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring embedded WebApplicationContext
2022-08-10 13:50:17.450  INFO 9136 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1561 ms
2022-08-10 13:50:17.627  INFO 9136 --- [           main] .s.s.UserDetailsServiceAutoConfiguration : 

Using generated security password: d03e5995-a3d2-4cd6-8d42-303f6afe1d34

2022-08-10 13:50:17.721  INFO 9136 --- [           main] o.s.s.w.DefaultSecurityFilterChain       : Will not secure any request
2022-08-10 13:50:18.255  INFO 9136 --- [           main] o.s.l.c.s.AbstractContextSource          : Property 'userDn' not set - anonymous context will be used for read-write operations
août 10, 2022 1:50:18 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-nio-127.0.0.1-8081"]
2022-08-10 13:50:18.362  INFO 9136 --- [           main] o.s.b.w.e.t.TomcatWebServer              : Tomcat started on port(s): 8081 (http) with context path '/svs/v1'
2022-08-10 13:50:18.380  INFO 9136 --- [           main] c.a.SVSApplication                       : Started SVSApplication in 2.971 seconds (JVM running for 3.825)

So those are the logs when my app start/ From this line :

août 10, 2022 1:50:17 PM org.apache.coyote.AbstractProtocol init

to this line :

INFO: Initializing Spring embedded WebApplicationContext

And those two lines :

août 10, 2022 1:50:18 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-nio-127.0.0.1-8081"]

They are displayed in red like a System.err output and I would Like to know why

This is the properties of my project :


server.servlet.context-path=/svs/v1
server.address=127.0.0.1
server.port=8081

logging.level.org.springframework=ERROR
logging.level.com.avem=DEBUG
logging.level.org.springframework.web=INFO
logging.level.org.hibernate=ERROR
logging.level.net.guides=DEBUG
logging.level.root=INFO
logging.file=app.log
logging.config = logback.xml

logging.path=logs


logging.pattern.file=%d %p %c{1.} [%t] %m%n
logging.pattern.console=%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n


logging.level.org.apache=DEBUG

And this is my logback.xml file

<?xml version="1.0" encoding="UTF-8"?>
<configuration>

    <property name="HOME_LOG" value="logs/app.log"/>

    <appender name="FILE-ROLLING" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${HOME_LOG}</file>

        <rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
            <fileNamePattern>logs/archived/app.%d{yyyy-MM-dd}.%i.log</fileNamePattern>
            <!-- each archived file, size max 10MB -->
            <maxFileSize>10MB</maxFileSize>
            <!-- total size of all archive files, if total size > 20GB,
                it will delete old archived file -->
            <totalSizeCap>20GB</totalSizeCap>
            <!-- 60 days to keep -->
            <maxHistory>60</maxHistory>
        </rollingPolicy>

        <encoder>
            <pattern>%d %p %c{1.} [%t] %m%n</pattern>
        </encoder>
    </appender>

    <logger name="com.avem" level="debug" additivity="false">
        <appender-ref ref="FILE-ROLLING"/>
    </logger>

    <root level="error">
        <appender-ref ref="FILE-ROLLING"/>
    </root>

</configuration>

Those reds logs seems to be with Tomcat so I tried to desactivate the tomcat Logs without any success. The parameters of my IDE are fine, others project don't have this issue, those lignes are displayed well in white

Does this answer your question? [Debug mode: Red messages are confusing me](https://stackoverflow.com/questions/55961047/debug-mode-red-messages-are-confusing-me) — Vlad Nitu, Aug 10 '22 at 12:08
@VladNitu no its does not, my parameters are correct there. The weird thing is that I have others project and thos logs are displaying correctly like a normal System.out — Bastien, Aug 10 '22 at 12:10
slf4j is a logger facade, you actually seem to be switching to logback. In any case, I guess you need to add the jul-to-slf4j library to your project (as I believe java.util.logging that is the default logging platform used by Tomcat). — Mark Rotteveel, Aug 10 '22 at 14:41

Spring boot Slf4j : Some logs when starting are displayed in red but they are not error

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