When I was starting to build up a sample project for JPA for learning the Java EE suite I wanted to test that my entities where persisted correctly and for that I was using the inmemory database hsqldb. However when I was getting my persistence.xml set up correctly I still got the issue with:
I googled around a bit, but couldn't really find the issue until the great source stackoverflow got me to the correct solution:
Just put in the property in your persistence.xml (in the persistence-unit you are using for testing):
<properties>
<property name="javax.persistence.validation.mode" value="none"/>
...
...
</properties>
Don't know if this issue where related to using hibernate or not.
Will probably release my hobby-project to github soon.
