Spring Boot doesn't create automatic configuration for database from application.properties

I have followed a guide for creating simple spring boot app with JPA and when application was completed it should have created database connection based on configuration from application.properties file, however it didn't happen (I get Not an managed type exceptions). I know this is issuse with application.properties file because app runs correctly when I configure it manually like here.

Project structure:

POM.xml:

<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>demo.tomek</groupId>
<artifactId>SpringMVC</artifactId>
<version>0.0.1-SNAPSHOT</version>
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.3.5.RELEASE</version>
</parent>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-entitymanager</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
    </dependency>


</dependencies>

<properties>
    <java.version>1.8</java.version>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
</properties>

<repositories>
    <repository>
        <id>spring-releases</id>
        <name>Spring Releases</name>
        <url>https://repo.spring.io/libs-release</url>
    </repository>
</repositories>
<pluginRepositories>
    <pluginRepository>
        <id>spring-releases</id>
        <url>https://repo.spring.io/libs-release</url>
    </pluginRepository>
</pluginRepositories>


<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.1</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
    </plugins>
</build>

application.properties file:

spring.datasource.url = jdbc:mysql://localhost:3306/TEST?createIfNotExists=true
spring.datasource.driverClassName = com.mysql.jdbc.Driver
spring.datasource.username=root
spring.datasource.password=but

spring.jpa.show-sql=true

# Enable spring data repos 
spring.data.jpa.repositories.enabled=true
spring.jpa.database-platform=org.hibernate.dialect.MySQL5Dialect
spring.jpa.hibernate.ddl-auto=update

spring.thymeleaf.cache=false
spring.template.cache=false

static void main()

@SpringBootApplication
@ComponentScan("demo")
@EnableJpaRepositories("demo")
public class SpringBootTEST {

    public static void main(String[] args) {
        ApplicationContext ctx = SpringApplication.run(SpringBootTEST.class, args);

        ProductService pRepo = ctx.getBean("productService", ProductService.class);
        pRepo.addSomeProducts();
        CustomerService cRepo = ctx.getBean("customerService", CustomerService.class);
        cRepo.addSomeCustomers();
    }
}

Let me stress it again: everything works fine when I configure it manually like here: http://www.baeldung.com/2011/12/13/the-persistence-layer-with-spring-3-1-and-jpa/

I run out of ideas...