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

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

So you're building a Spring Boot Batch application with MongoDB, and you've encountered the dreaded error message: Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured. This error can be quite frustrating, especially when you have already started the mongod server. But don't worry, I've got your back! In this blog post, I'll walk you through the common causes of this issue and provide easy solutions to get your application up and running smoothly.

What does the error mean?

The error message indicates that Spring Boot couldn't configure a DataSource because the 'url' attribute is not specified and there is no embedded datasource configuration available. It also mentions that it failed to determine a suitable driver class. Basically, this means that Spring Boot couldn't establish a connection to your MongoDB database.

Possible causes and solutions

1. Missing or incorrect configuration in application.properties: The first thing you need to check is your application.properties file. Make sure that you have correctly specified the MongoDB database URI using the spring.data.mongodb.uri property. For example:

   spring.data.mongodb.uri=mongodb://localhost:27017/test

   Also, ensure that you have included the relevant dependencies in your pom.xml file for Spring Boot and MongoDB, as shown in the example below:

   <dependencies> <!-- Spring Boot --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-batch</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-mongodb</artifactId> </dependency> <!-- Other dependencies --> ... </dependencies>

2. Missing MongoDB driver dependency: Another possible cause for this error is not having the MongoDB driver dependency in your pom.xml file. Make sure you have included the mongodb-driver dependency, like so:

   <dependency> <groupId>org.mongodb</groupId> <artifactId>mongodb-driver</artifactId> <version>3.12.7</version> </dependency>

3. Incorrect MongoDB server configuration: Double-check that your MongoDB server is running on the correct host and port. In the output you shared, it seems that your MongoDB server is running on localhost with the default port 27017. Verify that these configurations match the ones specified in your application.properties file.

4. Database settings and profiles: If you have database settings that need to be loaded from a particular profile, ensure that you have activated the appropriate profile. You can do this by setting the spring.profiles.active property in your application.properties file. For example:

   spring.profiles.active=dev

5. Missing or incompatible MongoDB server: Lastly, it's worth checking the version compatibility between your MongoDB server and the MongoDB driver that you have included in your project. Make sure the versions are compatible with each other to avoid any conflicts.

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I hope this troubleshooting guide helped you resolve the "Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured" issue. If you have any more questions or need further assistance, don't hesitate to reach out to our community.

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