NullPointerException when using bean in class method

I have a Spring-boot app. I want to use variable from application.properties in class method but I have nullPointerException.

Here's a simple example that doesn't work.

application.properties:

#data paths
file.path=C:\\Users\\apodar\\autoTest

Config.java

package com.eserv.autotest;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component
public class Config {

@Value("${file.path}")
String filePath;

    public String getFilePath() { return filePath; }
    public String getScreenshotsPath() {
        return getFilePath() + "/screenshots";
       }

}

AutotestApplication.java

package com.eserv.autotest;

import org.apache.tomcat.jdbc.pool.DataSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.transaction.annotation.Transactional;


@SpringBootApplication(
        scanBasePackageClasses = {
            AutotestApplication.class,
       }
)
public class AutotestApplication implements CommandLineRunner {


    @Autowired DataSource dataSource;

    public static void main(String[] args) {
        SpringApplication.run(AutotestApplication.class, args);
    }

    @Transactional(readOnly = true)
    @Override
    public void run(String... args) throws Exception {

         System.out.println("DATASOURCE = " + dataSource);

    }
 }

SeleniumTestExecutionListener:

    public class SeleniumTestExecutionListener extends AbstractTestExecutionListener {

    @Inject Config config;

    private WebDriver webDriver;

    @Override
    public void afterTestMethod(TestContext testContext) throws Exception {
        if (testContext.getTestException() == null) {
            return;
        }
        File screenshot = ((TakesScreenshot) webDriver).getScreenshotAs(OutputType.FILE);
        String testName = toLowerUnderscore(testContext.getTestClass().getSimpleName());
        String methodName = toLowerUnderscore(testContext.getTestMethod().getName());

        FileUtils.copyFile(screenshot, new File( config.getScreenshotsPath() + testName + "_" + methodName + "_" + screenshot.getName()));
    }

}

Why does config.getScreenshotsPath() method doesn't return path. config is null.