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Why am I getting this exception? package com.domain.idea; import javax.persistence.CascadeType; import javax.persistence.Entity; import javax.persistence.FetchType; import javax.persistence.JoinColumn; import javax.persistence.OneToOne; import javax.persistence.Table; import org.hibernate.annotations.AccessType; /** * object model for the view [InvestmentReturn].[vMAE_MFE] */ @Entity @Table(name="vMAE_MFE", schema="InvestmentReturn") @AccessType("field") public class MAE_MFEView { /** * trade property is a SuggestdTradeRecommendation object */ @OneToOne(fetch = FetchType.LAZY , cascade = { CascadeType.PERSIST }) @JoinColumn(name = "suggestedTradeRecommendationID") private SuggestedTradeRecommendation trade; /** * Most Adeverse Excursion value */ private int MAE; public int getMAE() { return MAE; } /** * Most Favorable Excursion value */ private int MFE; public int getMFE() { return MFE; } /** * @return trade property * see #trade */ public SuggestedTradeRecommendation getTrade() { return trade; } } Update: I've changed my code to look like this: package com.domain.idea; import javax.persistence.CascadeType; import javax.persistence.FetchType; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.OneToOne; import javax.persistence.Table; import org.hibernate.annotations.AccessType; /** * object model for the view [InvestmentReturn].[vMAE_MFE] */ @Entity @Table(name="vMAE_MFE", schema="InvestmentReturn") @AccessType("field") public class MAE_MFEView { /** * trade property is a SuggestdTradeRecommendation object */ @Id @OneToOne(fetch = FetchType.LAZY , cascade = { CascadeType.PERSIST }) @JoinColumn(name = "suggestedTradeRecommendationID") private SuggestedTradeRe

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