Relationship is not created in the hibernate entity when creating foreign key based on the unique key in another table.

I have  question related to hibernate (JPA Annotations).
I have two tables,first table contains two column,one is primary and other is unique and not null.
Second table contains the foreign key on the basis of unique key in the database.
When i create bean through jpa(plugin in eclipse),there is no relationship is shown and no relationship exists between the two tables in the generated entities.
If i create foreign key on the basis of primary key,relationship is shown in the entities.
Please help me out.
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This is likely a Hibernate question more than an Oracle question.

First I would check to see whether an actual unique constraint exists on the column in the parent table (not just a unique index, but an actual constraint), because I have found by experience some tools don't don't properly handle "unique" indexes the same as constraints. But since you said you've created a foreign key, it should still honor the foreign key constraint, which leads me to believe it is a Hibernate question. Hence, it needs to be moved to the Hibernate zone.

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