breaking change
In order to publish j-metamorphosis to maven central repo, it needed to change the package.
So, to import j-metamorphosis 3.0.0, add to your pom.xml
<dependency>
<groupId>it.fabioformosa</groupId>
<artifactId>metamorphosis-core</artifactId>
<version>3.0.0</version>
</dependency>
or if you use JPA
<dependency>
<groupId>it.fabioformosa</groupId>
<artifactId>metamorphosis-jpa</artifactId>
<version>3.0.0</version>
</dependency>