I’m trying to build an API on spring boot version 3.1.1, but I got these errors:

`Could not obtain connection to query metadata. 

java.lang.NullPointerException: Cannot invoke       "org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(java.sql.SQLException, String)" because the return value of "org.hibernate.resource.transaction.backend.jdbc.internal.JdbcIsolationDelegate.sqlExceptionHelper()" is null

org.hibernate.HibernateException: Unable to determine Dialect without JDBC metadata (please set 'jakarta.persistence.jdbc.url' for common cases or 'hibernate.dialect' when a custom Dialect implementation must be provided)`

This is my application.properties:
spring.datasource.url= jdbc:postgresql://localhost:5432/db-name spring.datasource.username=postgres-user spring.datasource.password=password spring.jpa.hibernate.ddl-auto=update spring.jpa.properties.hibernate.jdbc.lob.non_contextual_creation=true

I’m using postgresql on linux mint and my version is
(PostgreSQL) 14.12 (Ubuntu 14.12-0ubuntu0.22.04.1).

I tried to specify the dialect with:

`spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect`

However, it had no effect on the error.

Someone knows why these errors happened and how to fix it?