Could not determine type for: java.util.Set error

[A Tham]

I am trying to do a many to many relationship using hibernate.

In my GnrlOrgChargeCode class, I have:

    @ManyToMany(cascade = { CascadeType.ALL })
    @JoinTable(
        name = "org_charge_code_cond", 
        joinColumns = { @JoinColumn(referencedColumnName = "org_charge_code_id") }, 
        inverseJoinColumns = { @JoinColumn(referencedColumnName = "billing_cond_id") }
    )
	java.util.Set<BillingCondition> billingConditions;

In my OrgChargeCodeCond class, I have

private Long orgChargeCodeId;
private Long billingConditionId;

and in my BillingCondition class, I have

private Long billingConditionId; 

But I am getting an error:

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

Please help. Thanks.

[Campbell Ritchie]

Which line does the error occur on? Is it in the code you posted?
Why are you using Longs rather than longs?