Hibernate尝试将null插入到mapkey中

我有一个使用Map的双向映射。当我尝试坚持它时，我得到一个错误，认为hibernate不能将null插入到mapkey列中。Hibernate尝试将null插入到mapkey中

地图实体：

@Entity 
@Table(name = "map_parent) 
public class MapParent { 

    private long id; 
    private Map<String, Metadata> datamap = new HashMap<String, Metadata>(); 

    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO, generator = "MY_SEQ_GEN") 
    @SequenceGenerator(name = "MY_SEQ_GEN", 
      sequenceName = "my_base_sequence", 
      allocationSize = 1) 
    public long getId() { 
     return id; 
    } 

    public void setId(long id) { 
     this.id = id; 
    } 

    @OneToMany(cascade = CascadeType.ALL) 
    @MapKeyColumn(name = "mapKey") 
    @JoinColumn(name="datamap_id")  
    public Map<String, Metadata> getDataMap() { 
     return dataMap; 
    } 

    public void setDataMap(Map<String, Metadata> dataMap) { 
     this.dataMap = dataMap; 
    } 
}

价值实体：

@Entity 
@Table(name = "my_metadata") 
public class Metadata { 

    private boolean binary = false; 
    private String data; 
    private MapParent parent; 

    public Metadata() { 
     //empty bean constructor 
    } 

    @Column(name = "binary") 
    public boolean isBinary() { 
     return binary; 
    } 

    public void setBinary(boolean binary) { 
     this.binary = binary; 
    } 

    @Column 
    public String getData() [ 
     return data; 
    } 

    public void setData(String data) { 
     this.data = data; 
    } 

    @ManyToOne 
    @JoinColumn(name = "datamap_id", updatable = false, insertable = false) 
    public MapParent getMapParent() { 
     return mapParent; 
    } 

    public void setMapParent(MapParent mapParent) { 
     this.mapParent = mapParent; 
    }

的坚持代码：

public void submit() { 
    MapParent parent = new MapParent(); 
    Metadata metadata1 = new Metadata(); 
    metadata1.setData("Data 1"); 
    parent.getDataMap().put("Metadata1", metadata1); 
    entityManager.persist(parent); 
    entityManager.flush(); 
}

上面的代码提供了以下堆栈跟踪：

org.hibernate.exception.ConstraintViolationException: could not execute statement  
Caused by: java.sql.SQLIntegrityConstraintViolationException: ORA-01400: cannot insert NULL into ("MY_Metadata"."MAPKEY") 

    at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:450) 
    at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:399) 
    at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:1017) 
    at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:655) 
    at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:249) 
    at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:566) 
    at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:215) 
    at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:58) 
    at oracle.jdbc.driver.T4CPreparedStatement.executeForRows(T4CPreparedStatement.java:943) 
    at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1075) 
    at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3820) 
    at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:3897) 
    at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeUpdate(OraclePreparedStatementWrapper.java:1361) 
    at org.jboss.jca.adapters.jdbc.WrappedPreparedStatement.executeUpdate(WrappedPreparedStatement.java:493) 
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:186) [hibernate-core-4.2.18.Final-redhat-2.jar:4.2.18.Final-redhat-2] 
    ... 91 more

任何帮助解决这个错误是不胜感激。

来源

2016-06-30 shura_k85

错误在于mapkey被设置为null，而不是连接列。这不是同一个问题。 –

在保存之前设置'metadata1.setMapParent（parent）'。 –

我试过了。它没有什么区别。 –

找到了解决方案 - 将mapKey添加为元数据中的字段，并将其与该集合一起保存。

来源

2016-07-07 17:48:13

Hibernate尝试将null插入到mapkey中

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