Springboot: org.hibernate.MappingException: Could not get constructor for org.hibernate.persister.entity.SingleTableEntityPersister

The problem is with Jdk 11 and javassist.

Add this in your pom.xml:

<dependency>
    <groupId>org.javassist</groupId>
    <artifactId>javassist</artifactId>
    <version>3.23.1-GA</version>
</dependency>

Info taken from: here

One needs to be careful when migration from Java 8 to Java 11, many things don’t work out of the box.