I have solved it
I my case when I opened class ProcessInstanceInfo then my IDE start highlight @CollectionOfElements annotation in line 66.
So solution to my exception[1] was to add a hibernate-annotations dependency/library to my pom.xml[2]
I hope that will help you too :)
[1] Caused by: org.hibernate.MappingException: Could not determine type for: java.util.Set, at table: ProcessInstanceInfo, for columns: [org.hibernate.mapping.Column(eventTypes)]
[2] <dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-annotations</artifactId>
<version>3.4.0.GA</version>
</dependency>