Gaurang Parmar ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=635c2c2... ) *created* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiNjYyY2RlNDRk... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-15643?atlOrigin=eyJpIjoiNjYyY2... ) HHH-15643 ( https://hibernate.atlassian.net/browse/HHH-15643?atlOrigin=eyJpIjoiNjYyY2... ) @OneToOne bidirectional relation ignores @JoinColumn referencedColumnName ( https://hibernate.atlassian.net/browse/HHH-15643?atlOrigin=eyJpIjoiNjYyY2... ) Issue Type: Bug Affects Versions: 5.6.12 Assignee: Unassigned Attachments: onetoone.log Components: hibernate-orm-modules Created: 28/Oct/2022 12:50 PM Priority: Major Reporter: Gaurang Parmar ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=635c2c2... ) I am trying to add one-to-one bidirectional relationship on non-primary key unique key field. full code is available at https://github.com/gaurangparmar/jpa ( https://github.com/gaurangparmar/jpa ) OrderHeader.java @Entity @Table(name = "ORD_HDR" ,schema="ORDERS", uniqueConstraints = { @UniqueConstraint(name = "ORD_HDR_UK1", columnNames = { "ORD_ID" })}) @Data @NoArgsConstructor @EqualsAndHashCode(callSuper=false) public class OrderHeader implements Serializable { private static final long serialVersionUID = 1L; @Id @Column(name = "ORD_HDR_ID", nullable = false, updatable = false) @SequenceGenerator( name = "ORD_HDR_ID_SEQ", sequenceName = "ORDERS.ORD_HDR_ID_SEQ", allocationSize = 1, initialValue = 1) @GeneratedValue( strategy = GenerationType.SEQUENCE, generator = "ORD_HDR_ID_SEQ" ) private int orderHeaderId; @Column(name = "ORD_ID", nullable = false, updatable = false, length = 10) private String orderId; ..... @Column(name="DLV_DT") private LocalDate deliveryDate; @OneToOne(mappedBy = "orderHeader", fetch = FetchType.LAZY, cascade = CascadeType.ALL,orphanRemoval = false) private OrderMeta orderMeta; } OrderMeta.java @Entity @Table(name = "ORD_META" ,schema="ORDERS", uniqueConstraints = { @UniqueConstraint(name = "ORD_META_UK1", columnNames = { "ORD_ID" })}) @Data @NoArgsConstructor @EqualsAndHashCode(callSuper=false) public class OrderMeta implements Serializable { private static final long serialVersionUID = 1L; @Id @Column(name = "ORD_META_ID", nullable = false, updatable = false) @SequenceGenerator( name = "ORD_META_ID_SEQ", sequenceName = "ORDERS.ORD_META_ID_SEQ", allocationSize = 1, initialValue = 1) @GeneratedValue( strategy = GenerationType.SEQUENCE, generator = "ORD_META_ID_SEQ" ) private int orderMetaId; @Column(name = "ORD_ID", nullable = false, updatable = false, length = 10) private String orderId; ...... @OneToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL,orphanRemoval = false) @JoinColumn(name="ORD_ID", referencedColumnName = "ORD_ID", nullable = false, insertable = false, updatable = false) private OrderHeader orderHeader; } orderId in both tables are unique and Primary/Main entity is OrderHeader and OrderMeta is having foreign key orderId referencing to OrderHeader. Full logs are attached from test case run. I believe it is trying to fetch related entity data by primary key and ignoring specified joincolumn. Error accessing field [private java.lang.String com.gaurang.test.entity.OrderHeader.orderId] by reflection for persistent property [com.gaurang.test.entity.OrderHeader#orderId] : 1; nested exception is org.hibernate.property.access.spi.PropertyAccessException: Error accessing field [private java.lang.String com.gaurang.test.entity.OrderHeader.orderId] by reflection for persistent property [com.gaurang.test.entity.OrderHeader#orderId] : 1 org.springframework.orm.jpa.JpaSystemException: Error accessing field [private java.lang.String com.gaurang.test.entity.OrderHeader.orderId] by reflection for persistent property [com.gaurang.test.entity.OrderHeader#orderId] : 1; nested exception is org.hibernate.property.access.spi.PropertyAccessException: Error accessing field [private java.lang.String com.gaurang.test.entity.OrderHeader.orderId] by reflection for persistent property [com.gaurang.test.entity.OrderHeader#orderId] : 1 ... ... Caused by: org.hibernate.property.access.spi.PropertyAccessException: Error accessing field [private java.lang.String com.gaurang.test.entity.OrderHeader.orderId] by reflection for persistent property [com.gaurang.test.entity.OrderHeader#orderId] : 1 at app//org.hibernate.property.access.spi.GetterFieldImpl.get(GetterFieldImpl.java:75) ... ... Caused by: java.lang.IllegalArgumentException: Can not set java.lang.String field com.gaurang.test.entity.OrderHeader.orderId to java.lang.Integer at java.base/jdk.internal.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:167) at java.base/jdk.internal.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:171) at java.base/jdk.internal.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:58) at java.base/jdk.internal.reflect.UnsafeObjectFieldAccessorImpl.get(UnsafeObjectFieldAccessorImpl.java:36) at java.base/java.lang.reflect.Field.get(Field.java:425) at org.hibernate.property.access.spi.GetterFieldImpl.get(GetterFieldImpl.java:71) ... 136 more I understand one-to-one relation better have primary key as foreign key but it is really dumb key for business and ETL uses this dumb keys. we really needed this to work. 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