Logback log file empty

Question

What do I need to change to have the logs get written on the log file using Logback?

   dependencies {
           implementation 'ch.qos.logback:logback-classic:1.2.3',
                         'ch.qos.logback:logback-core:1.2.3'
           api 'org.slf4j:slf4j-api:1.7.30'
                 }



 <configuration debug="true">
        <appender name="FILE" class ="ch.qos.logback.core.FileAppender">
          <file>logs\logfile.log</file>
          <append>true</append>
          <immediateFlush>false</immediateFlush>
          <encoder>
            <pattern>%-4relative [%thread] %-5level %logger{35} - %msg%n</pattern>
           </encoder>
        </appender>
    
        <appender name="STDOUT"
        class="ch.qos.logback.core.ConsoleAppender">
        <Target>System.out</Target>
          <encoder>
             <pattern> .....</pattern>
           </encoder>
        </appender>
    
        <root level="DEBUG">
         <appender-ref ref="FILE"/>
         <appender-ref ref="STDOUT"/>
        </root>
  </configuration>

In Java Class:

 private static final Logger log = LoggerFactory.getLogger(MyClass.class);
    public static void main(String[] args){
    log.debug("hello");
    }

The file logfile.log gets created under logs folder but it's empty and Console does show the log.

Answer 1

Probably you missed the logback-core dependency.

<dependency>
    <groupId>ch.qos.logback</groupId>
    <artifactId>logback-core</artifactId>
    <version>1.2.10</version>
</dependency>

or

dependencies {
    ...
    implementation 'ch.qos.logback:logback-core:1.2.10'
    ...
}

In addition to the other two you already have.

Other thing to do is to update to the latest versions of each dependency and see if the problem still occurs.

Reference: https://sematext.com/blog/logback-tutorial/ or https://www.baeldung.com/logback