Spring 启动项目看不到数据库连接数据，写在application.yml

Question

I'm writing a Java project in IntelliJ IDEA Community IDE. The technologies stack of this project:

• Spring Boot;
• Spring Data JPA;
• MySQL.

I have the application.yml file in project to connect with database, but when I run my app, I get an error:

APPLICATION FAILED TO START

Description:

Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.

Reason: Failed to determine a suitable driver class

I'm at a loss why my project doesn't see my application.yml file, which locates in /src/main/resources/database path in project.

Any ideas?

application.yml:

spring:
  jpa:
    database: mysql
    show-sql: true
    hibernate:
      ddl-auto: update
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/map
    username: root
    password: abcd

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>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.8.RELEASE</version>
        <relativePath/>
    </parent>

    <groupId>example.com</groupId>
    <artifactId>geo-informer</artifactId>
    <version>1.0</version>
    <name>Geo Informer</name>
    <description>
        The Spring Boot app, which makes interaction with the OpenStreetmap Nominatim API
        to work with geographic data and store it to the MySQL database
    </description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!-- Spring Boot -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- Spring Data JPA -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <!-- MySQL Connector -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <!-- Lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <!-- Spring Boot Maven plugin -->
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

This project is located here:

https://github.com/OlegSandro/geo-informer/tree/dev

Answer 1

Since the application.yml is not directly stored in src/main/resources it is not loaded.

In your EntryPoint.java file, you can add @PropertySource annotation and provide the path of your application.yml or you should store the file directly under the resources folder.

Answer 2

The application.yml or application.properties file should be in your classpath when the project is build. Spring boot has designed its structure such that when a maven build is executed, the property files from src/main/resources are placed into the classes directory with the other source files.

Therefore you need to directly place these files in src/main/resources

If you still wish to have the files elsewhere, you can point to the location with @PropertySource