"...[class sam.core.ejb.Website] has a mappedBy value of [Website] which does not exist..."
Did you set the mappedBy attribute to "website"? As this attribute needs to be the name of the variable in the corresponding class, for example:
Website:
@OneToMany(mappedBy="the_website")
private List<Crawl> crawls;
Crawl:
@ManyToOne
@JoinColumn(name="website_id")
private Website the_website;
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