SpringBoot: Cannot load driver class: org.postgresql.Driver - postgresql

Question

I have just created a new SpringBoot application (Java11) and am trying to connect to a Postgres database.
When I start the SpringBoot application, there is an error trying to connect to the database. The error reports that it Cannot load driver class: org.postgresql.Driver.
Question
How do I change my configuration below to get the SpringBoot application to connect to the database?
database version
PostgreSQL 12.6 on x86_64-apple-darwin16.7.0, compiled by Apple LLVM
version 8.1.0 (clang-802.0.42), 64-bit
pom.xml
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
</dependency>
application.properties
# pims datasource
spring.datasource.url=jdbc:postgresql://localhost:5432/pims
spring.datasource.username=postgres
spring.datasource.password=
spring.datasource.driverClassName=org.postgresql.Driver
#spring.datasource.driver-class-name=org.postgresql.Driver
#spring.jpa.database-platform=postgres
spring.jpa.show-sql=true
spring.datasource.dbcp2.test-while-idle=true
spring.datasource.dbcp2.validation-query=select 1
#spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect
spring.jpa.hibernate.naming.implicit-strategy=org.hibernate.boot.model.naming.ImplicitNamingStrategyLegacyHbmImpl
spring.jpa.hibernate.naming.physical-strategy=org.springframework.boot.orm.jpa.hibernate.SpringPhysicalNamingStrategy
When I run the #SpringBootApplication class, SpringBoot starts to start up as expected, but gets the following error.
error
Error starting ApplicationContext. To display the conditions report
re-run your application with 'debug' enabled. 2021-06-15 11:58:51.770
ERROR 68967 --- [ main] o.s.boot.SpringApplication
: Application run failed
org.springframework.beans.factory.UnsatisfiedDependencyException:
Error creating bean with name 'dataSourceScriptDatabaseInitializer'
defined in class path resource
[org/springframework/boot/autoconfigure/sql/init/DataSourceInitializationConfiguration.class]:
Unsatisfied dependency expressed through method
'dataSourceScriptDatabaseInitializer' parameter 0; nested exception is
org.springframework.beans.factory.BeanCreationException: Error
creating bean with name 'dataSource' defined in class path resource
[org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class]:
Bean instantiation via factory method failed; nested exception is
org.springframework.beans.BeanInstantiationException: Failed to
instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method
'dataSource' threw exception; nested exception is
java.lang.IllegalStateException: Cannot load driver class:
org.postgresql.Driver
If I remove the following entry (i.e. don't define the driver in application.properties and just have the pom dependency):
spring.datasource.driverClassName=org.postgresql.Driver
I then get the following error:
Failed to load driver class org.postgresql.Driver in either of HikariConfig class loader or Thread context classloader

Answer 1

When I expend the external dependency tree, I didn't find any jar for postgressql. After reimport maven dependency, it is added correctly and problem is gone. It is fine now.

Answer 2

You do not need any specific configuration to connect database unless your repository and entity packages are not pulled from another dependency.
I would suggest you to check your connection between your computer and maven repository. You should be missing your postgre dependecy somehow.
(You also would try providing specific version of postgresql artifact)