SLF4J：无法加载 class“org.slf4j.impl.StaticLoggerBinder”错误

Question

I am running my app with Maven. But I get an error:

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.

App uses log4j:

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class App {
    public static void main(String[] args) {
        Logger logger = LoggerFactory.getLogger(App.class);
        logger.info("Test 1,2,3");
        System.out.println("End of my program");

    }
}

pom.xml file includes next dependencies:

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.30</version>
        </dependency>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-simple</artifactId>
            <version>1.7.30</version>
            <scope>test</scope>
        </dependency>

How to solve this problem? I checked solutions in google but it doesnt help...

I tried to add implepentation for example slf4j-simple but nothing changed

errr

Answer 1

The solution did not need to test scope in Slf4j Dependencies because it is probably not available when you run your main method.

       <dependency>
           <groupId>org.slf4j</groupId>
           <artifactId>slf4j-api</artifactId>
           <version>1.7.30</version>
       </dependency>

       <dependency>
           <groupId>org.slf4j</groupId>
           <artifactId>slf4j-simple</artifactId>
           <version>1.7.30</version>
           <scope>test</scope>  //Remove the test scope
       </dependency>

Then it's working fine without any errors.

Thanks.