Failed to determine a suitable driver class - Spring Boot- PostgreSQL - postgresql

Question

I am trying to connect a Postgres DB to my Spring Boot aplication, but I get the following error:
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
Action:
Consider the following:
If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.
If you have database settings to be loaded from a particular profile you may need to activate it (no profiles are currently active).
application.yaml
datasource:
driver-class-name: org.postgresql.Driver
url: jdbc:postgresql://localhost:5432/my_db
username: postgres
password: pswrd
# JPA properties
jpa:
hibernate:
ddl-auto: update # When you launch the application for the first time - switch "none" at "create"
show-sql: true
database: my_db
database-platform: org.hibernate.dialect.PostgreSQLDialect
open-in-view: false
generate-ddl: true
Project structure:
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 https://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>2.5.2</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>PostgresApp</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>PostgresApp</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>11</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

Answer 1

You appear to be missing the spring prefix from all of the properties in your application.yaml. It should be the following:
spring:
datasource:
driver-class-name: org.postgresql.Driver
url: jdbc:postgresql://localhost:5432/my_db
username: postgres
password: pswrd
# JPA properties
jpa:
hibernate:
ddl-auto: update # When you launch the application for the first time - switch "none" at "create"
show-sql: true
database: my_db
database-platform: org.hibernate.dialect.PostgreSQLDialect
open-in-view: false
generate-ddl: true