Fix Hibernate-Spatial with Spring Boot

I'm facing issues with hibernate-spatial in my Spring Boot application using PostgreSQL. The application fails to start due to errors in the application.properties file. Specifically, I cannot resolve the name for the property `spring.jpa.database-platform=org.hibernate.spatial...`.

I need an experienced Spring Boot and Hibernate developer with expertise in PostgreSQL to:

- Diagnose and fix the application.properties errors
- Ensure proper configuration of hibernate-spatial with Spring Boot and PostgreSQL
- Verify that the application starts without errors

Ideal skills and experience:
- Strong knowledge of Spring Boot
- Proficient in Hibernate and Hibernate-Spatial
- Experienced with PostgreSQL configuration
- Familiarity with application.properties file configuration and troubleshooting