Failed to auto-configure a DataSource: 'spring.datasource.url' is not specified

I have created a basic spring boot application from **SPRING INITIALIZR** with the Web, MongoDB and JPA dependencies.

When I try to run the spring boot application I am getting the following exception:


Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2018-03-25 16:27:02.807 ERROR 16256 --- [ restartedMain] o.s.b.d.LoggingFailureAnalysisReporter :

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APPLICATION FAILED TO START
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Description:
Failed to auto-configure a DataSource: 'spring.datasource.url' is not specified and no embedded datasource could be auto-configured.
Reason: Failed to determine a suitable driver class

Action:

Consider the following situation:
If you want an embedded database like H2, HSQL or Derby, please add it in the Classpath.
If you have database settings to be loaded from a particular profile you may need to activate it since no profiles were currently active.

In application.properties file I am having the following configuration:

server.port=8081
spring.data.mongodb.database=TestDatabase
spring.data.mongodb.host=localhost
spring.data.mongodb.port=27017

**Versions which I use:**
Spring : 5.0.4,
MongoDB : 3.6,
Spring Boot: 2.0