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

Question

I am working on a Spring Boot Batch example with MongoDB and I have already started the mongod server.

When I launch my application, I

Answer 1

check your application.properties

changing

spring.datasource.driverClassName=com.mysql.jdbc.Driver

to

spring.datasource.driver-class-name=com.mysql.jdbc.Driver

worked for me. Full config:

spring.datasource.url=jdbc:mysql://localhost:3306/db
spring.datasource.username=
spring.datasource.password=   
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.database-platform = org.hibernate.dialect.MySQL5Dialect
spring.jpa.generate-ddl=true
spring.jpa.hibernate.ddl-auto = update

Answer 2

Adding h2 dependency to the pom file can resolve such issues. ...... com.h2database h2 ......

Answer 3

Not to the point of the question (can be related though), but, if you bootstrap a new project and wondering why do you get the same error, it may come from the artifactId of spring-boot-starter-data-jpa in the dependency section. I gave the dependency below. You will need to define the database to get rid of this.

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

Answer 4

It simply means you have downloaded a spring starter code with database dependency without configuring your database. So it doesn't know how to connect. For Spring boot version 2.18 do the below steps to fix it.

1. Create a database for the driver you have downloaded ie mysql/mongo etc.

2. In your applications.properties file add the db connection info. Sample is given for mysql if your db is mongo change it for mongo.

   spring.datasource.url=jdbc:mysql://localhost:3306/db_name_that_you_created spring.datasource.username=your_db_username_here spring.datasource.password=your_db_pass_here spring.datasource.driver-class-name=com.mysql.jdbc.Driver spring.jpa.database-platform = org.hibernate.dialect.MySQL5Dialect spring.jpa.generate-ddl=true spring.jpa.hibernate.ddl-auto = update

3. Reboot the server it will be running.