Hot-swap not working in Spring Boot application

I am out of ideas.

I have followed these instructions: Intellij IDEA – Spring boot reload static file is not working

and searched through all kinds of pages but hot reloading is simply not working.

I have added the devtools

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-devtools</artifactId>
    <optional>true</optional>
</dependency>

I have enabled the automatic build:

and I have enabled compiler.automake.allow.when.app.running

and I set On 'Update' action to Update classes and resources after trying to user a Spring Boot run configuration (as suggested here).

But it's still not working.

This here is my entire pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>audio-platform</groupId>
    <artifactId>server</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <spring.boot.version>2.2.2.RELEASE</spring.boot.version>
    </properties>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.2.RELEASE</version>
        <relativePath/>
    </parent>

    <dependencies>

        <!-- Spring Framework Boot -->

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-rest</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-logging</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.ws</groupId>
            <artifactId>spring-ws-core</artifactId>
        </dependency>

        <!-- Spring Security -->

        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-jwt</artifactId>
            <version>1.0.9.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.security.oauth</groupId>
            <artifactId>spring-security-oauth2</artifactId>
            <version>2.3.2.RELEASE</version>
        </dependency>

        <!-- Spring Docs (Swagger) -->

        <!-- TODO After version upgrades check https://github.com/springdoc/springdoc-openapi/issues/133 -->

        <dependency>
            <groupId>org.springdoc</groupId>
            <artifactId>springdoc-openapi-core</artifactId>
            <version>1.1.49</version>
            <exclusions>
                <exclusion>
                    <groupId>io.github.classgraph</groupId>
                    <artifactId>classgraph</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.springdoc</groupId>
            <artifactId>springdoc-openapi-ui</artifactId>
            <version>1.1.49</version>
        </dependency>

        <dependency>
            <groupId>io.github.classgraph</groupId>
            <artifactId>classgraph</artifactId>
            <version>4.8.44</version>
        </dependency>

        <!-- Sentry -->

        <dependency>
            <groupId>io.sentry</groupId>
            <artifactId>sentry-spring</artifactId>
            <version>1.7.23</version>
        </dependency>

        <!-- PostgreSQL Driver -->

        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <version>42.1.4</version>
        </dependency>

        <!-- Flyway -->

        <dependency>
            <groupId>org.flywaydb</groupId>
            <artifactId>flyway-core</artifactId>
        </dependency>

        <dependency>
            <groupId>org.flywaydb.flyway-test-extensions</groupId>
            <artifactId>flyway-spring-test</artifactId>
            <version>5.0.0</version>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <build>
        <plugins>

            <!-- Java version -->

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>

            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>

        </plugins>

    </build>

    <!-- Dependency Management -->

    <dependencyManagement>

        <dependencies>

            <!-- Import dependency management from Spring Boot -->

            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring.boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

        </dependencies>

    </dependencyManagement>

</project>

I am on Ubuntu 18.04 LTS and the directory is a local path, not a symlink or anything. All files belong to me (my user) etc and all permissions are as they should be.

What could I be still missing?