An Entity class with the following:

@Id
@GeneratedValue(generator = "system-uuid")
@GenericGenerator(name = "system-uuid", strategy = "uuid2")
@Column(name = "id", unique = true)
private UUID id;

gives the error:
Strategy class "uuid2" could not be found

changing the strategy to "uuid" will clear the error.

My Project Facet has JPA 2.0

The JPA configuration has:
Platform: Hibernate (JPA 2.0)
JPA implementation:
Disable Library Configuration

the Hibernate jars are on the project classpath