Hibernate 5.6.15, compiling JakartaNamespace.java
src/compat/JakartaNamespace.java:1: error: package jakarta.persistence does not exist
import jakarta.persistence.Entity;
                          ^
src/compat/JakartaNamespace.java:3: error: cannot find symbol
@Entity
 ^
  symbol: class Entity
2 errors
javac exit status: 1