@MappedSuperClass和Dropwizard的休眠未知實體異常

Question

我無法擺脫一個例外。

我有一個實體：

package mypackage.entities;

import javax.persistence.Entity;
import javax.persistence.Table;

@Entity
@Table(name = "raw_air_pressure")
public class RawAirPressureData extends RawSensorData {

    @Override
    public String toString() {
        [...]
    }
}

具有其超類：

package mypackage.entities;

import javax.persistence.Column;
import javax.persistence.MappedSuperclass;
import javax.validation.constraints.NotNull;

@MappedSuperclass
public abstract class RawSensorData extends BaseSensorData {

    @Column(name = "timestamp")
    @NotNull
    private Long timestamp;

    public Long getTimestamp() {
        return timestamp;
    }

    public void setTimestamp(Long timestamp) {
        this.timestamp = timestamp;
    }

    @Override
    public int hashCode() {
        [...]
    }

    @Override
    public boolean equals(Object obj) {
        [...]
    }
}

具有其超類：

package mypackage.entities;

import java.util.Date;

import javax.persistence.Column;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.MappedSuperclass;
import javax.persistence.SequenceGenerator;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.validation.constraints.NotNull;

import org.hibernate.annotations.CreationTimestamp;
import org.hibernate.annotations.UpdateTimestamp;

@MappedSuperclass
public abstract class BaseSensorData {

    @Id
    @SequenceGenerator(name = "my_seq", sequenceName = "my_seq", allocationSize = 1)
    @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="my_seq")
    @Column(name = "id")
    private Integer id;

    @Column(name = "value")
    @NotNull
    private Float value;

    @CreationTimestamp
    @Column(name = "created")
    @Temporal(TemporalType.TIMESTAMP)
    private Date created;

    @UpdateTimestamp
    @Column(name = "updated")
    @Temporal(TemporalType.TIMESTAMP)
    private Date updated;

    public Integer getId() {
        return id;
    }

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

    public Float getValue() {
        return value;
    }

    public void setValue(Float value) {
        this.value = value;
    }

    public Date getCreated() {
        return created;
    }

    public void setCreated(Date created) {
        if(created != null) {
            this.created = created;
        }
    }

    public Date getUpdated() {
        return updated;
    }

    public void setUpdated(Date updated) {
        if(updated != null) {
            this.updated = updated;
        }
    }

    @Override
    public int hashCode() {
        [...]
    }

    @Override
    public boolean equals(Object obj) {
        [...]
    }   
}

該實體已注冊為休眠狀態（dropwizard樣式）：

private static final HibernateBundle<MyServerConfiguration> hibernate = new HibernateBundle<MyServerConfiguration>(
    MyEntity1.class, MyEntity2.class, [...],
    RawAirPressureData.class) {

@Override
    public DataSourceFactory getDataSourceFactory(MyServerConfiguration configuration) {
        return configuration.getDataSourceFactory();
    }
};

在執行此JUnit時：

@Test
    public void testRawAirPressureData() {
        RawAirPressureData myData = TestUtils.generateTestRawAirPressureData();

        RawAirPressureData testMyData = database.inTransaction(() -> {
            return rawAirPressureDataDAO.persist(myData );
        });
[...]

我收到此異常：

org.hibernate.MappingException：未知實體：org.hibernate.internal.SessionImpl.getEntityPersister（SessionImpl.java:1635）上的org.hibernate.metamodel.internal.MetamodelImpl.entityPersister（MetamodelImpl.java:620）上的mypackage.entities.RawAirPressureData在org.hibernate.engine.internal.ForeignKeys.isTransient（ForeignKeys.java:225）在org.hibernate.event.internal.AbstractSaveEventListener.getEntityState（AbstractSaveEventListener.java:499）在org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate （DefaultSaveOrUpdateEventListener.java:83）在org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate（DefaultSaveOrUpdateEventListener.java:73）在org.hibernate.internal.SessionImpl.fireSaveOrUpdate（SessionImpl.java:660）在org.hibernate.internal。在mypackage.db上的org.hibernate.internal.SessionImpl.saveOrUpdate（SessionImpl.java:647）在io.dropwizard.hibernate.AbstractDAO.persist（AbstractDAO.java:202）處的SessionImpl.saveOrUpdate（SessionImpl.java:652） .baseSensorDataDAO.persist（BaseSensorDataDAO.java:33）在mypackage.db.BaseSensorDataDAOTest.lambda $ testRawAirPressureData $ 6（BaseSensorDataDAOTest.java:196）

以前所有的實體都可以正常工作。 但是它們都不是由mappingsuperclass組成的。 我不明白這里出了什么問題。

任何幫助將不勝感激。

Answer 1

問題是，盡管將使用序列，但在單元測試中，數據集是通過給出ID來創建的。 由於這個原因，它似乎首先用給定的ID存儲了recordat，然后嘗試按導致optimisitcLockException的順序覆蓋它。

刪除測試數據中的ID集后，該序列就可以自由運行了。