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

由 蹲街弑〆低调 提交于 2019-12-02 16:33:19

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
Valerio Vaudi

Your problem is the dependency of spring batch spring-boot-starter-batch that has a spring-boot-starter-jdbc transitive maven dependency.

Spring Batch is a framework for building reliable and fault tolerance enterprise batch jobs. It supports many features like restarting a failed batch, recording the status of the batch execution and so on. In order to achieve that Spring Batch uses a database schema to store the status of the registered jobs, the auto-configuration already provides you the basic configuration of the required data source and it is this configuration that requires the relational database configuration.

To solve this you must include some database driver like mysql, h2, etc. to configure the url.

Update: Just for getting start you can configure your application.yml like below:

spring:
  datasource:
    driver-class-name: org.h2.Driver
    url: jdbc:h2:mem:localhost;DB_CLOSE_ON_EXIT=FALSE
    username: admin
    password:

and of course in your pom.xml include the h2 dirver like this:

<?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>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
       ....
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
        </dependency>

....
    </dependencies>
...

</project>

The motivation, because you can not use mongo for this purpose, is that the usage of mongo is provided only for item readers and writers and not for managing the internal database of Spring Batch that is an internal schema, not a business schema. The query is plain SQL query and the internal abstraction relies on a relational database. It is necessary to have a database with ACID capability because every batch reads and writes a chunk of work and saves that information in order to restart the job. A NoSql solution is not suitable for this.

At the end you have configured a relational database in order to prepare Spring Batch for internal capability, the internal abstraction does not rely on mongo only on jdbc. Then mongo can be used but for the business side of the batch via item reader/writer.

I hope that this can help you to clear your doubts.

Arefe

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>

“Failed to configure a DataSource” error. First, we fixed the issue by defining the data source. Next, we discussed how to work around the issue without configuring the data source at all.

https://www.baeldung.com/spring-boot-failed-to-configure-data-source

Vinod

For spring boot version 2.X.X below configuration worked for me.

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

Old jdbc driver is deprecated. The new one is mentioned on above configuration. Please use the same and restart the project.

I had the same issue resolved by add <scope>provided</scope>

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

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

Source: https://github.com/spring-projects/spring-boot/issues/13796#issuecomment-413313346

I was just getting started on my first spring boot project, got this error. This link helped. They showed me how to add/configure the data source OR postpone configuration (which is what I needed).

Their solution was to exclude the DataSourceAutoConfiguration.class with

@SpringBootApplication(exclude={DataSourceAutoConfiguration.class})

But this didn't work for me. I instead, looked through the error message for the AutoConfig class that might be the root of my issue and ended up using:

@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class, XADataSourceAutoConfiguration.class})

Not sure why it only works when I exclude both classes. Excluding either one by itself didn't work for me.

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.

Just add : @SpringBootApplication(exclude = {DataSourceAutoConfiguration.class }) works for me.

I was getting same error I tried with @EnableAutoConfiguration(exclude=...) didn't work.

It's happening because the @valerio-vaudi said.

Your problem is the dependency of spring batch spring-boot-starter-batch that has a spring-boot-starter-jdbc transitive maven dependency.

But you can resolve it set the primary datasource with your configuration

 @Primary
 @Bean(name = "dataSource")
 @ConfigurationProperties(prefix = "spring.datasource")
 public DataSource getDataSource() {
      return DataSourceBuilder.create().build();
 }

 @Bean
 public JdbcTemplate jdbcTemplate(DataSource dataSource) {
      return new JdbcTemplate(dataSource);
 }

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

In my case 

spring.profiles = production // remove it to fix

in application.properties was the reason

标签
Spring
spring-boot
spring-batch
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