Spring Boot不会从application.properties为数据库创建自动配置

Question

我已经跟随a guide创建了使用JPA的简单spring启动应用程序，当应用程序完成时，应该根据application.properties文件中的配置创建数据库连接，但是它没有发生（我得到了） 不是托管类型例外）。我知道这是与application.properties文件一起使用的，因为当我像here那样手动配置app时，app会正确运行。

项目结构：

的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文件：

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();
    }
}

让我再次强调一下：当我手动配置它时，一切正常：http://www.baeldung.com/2011/12/13/the-persistence-layer-with-spring-3-1-and-jpa/

我没有想法......

Answer 1

由于您的实体不在应用程序类的子包中，因此您还必须将以下注释添加到SpringBootTEST，以便Hibernate可以扫描您的实体类：

@EntityScan("demo.database")

或者，如果您在SpringBootApplication注释中指定包：

，它也应该有用

@SpringBootApplication("demo")

然后您还应该能够删除自定义@ComponentScan和@EnableJpaRepositories注释。