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Spring and Hibernate many to many table relationship error

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I would like to implement this relationship in Java Spring and Hibernate:

In my GnrlOrgChargeCode class, I have:

and in my OrgChargeCodeCond class, I have:

and in my BillingCondition class:

and in my OrgChargeCodeRule class:

and in my BillingRule class:

But when I startup Tomcat, I get this error:

Could not determine type for: java.util.Set, at table: ORG_CHARGE_CODE_COND, for columns: [org.hibernate.mapping.Column(billingCondition)]

My query is this:

Please help. thanks.
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Your actual Hibernate JPA query would be quite easy, since all the joins are automatic in JPA.

But you didn't actually define a @ManyToMany relationship on anything there.

I appreciate your attempting to keep the code samples short, but if you could display more of the entity class definitions of GNRL_ORG_CHARGE_CODE, the join table GNRL_CHARGE_CODE_COND and the BILLING_CONDITION class, it would help a lot.

The things I need to see are the class definition line and its annotations, the joining annotations and the class member definitions for those joining annotations.
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This thread may be helpful https://stackoverflow.com/questions/6164123/org-hibernate-mappingexception-could-not-determine-type-for-java-util-set

Adding @ElementCollection for the list of billing collection may help.
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