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我正在将现有的 Spring 项目转换为 JPA/Jinq。我的数据库列之一是使用 PostGIS 几何 POINT 类型。我将该列的表映射到一个名为 City 的实体。像这样的类：

import java.io.Serializable
import javax.persistence.*;
import org.postgresql.geometric.PGpoint;

@Entity
@NamedQuery(name="City.findAll", query="SELECT c FROM City c")
public class City implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    private Integer id;

    @Column(name="location")
    private PGpoint location;

    /* constructor, getters, and setters */
}

我使用 EclipseLink 的逆向工程功能生成了这个类，但是该location字段最初Object是不可序列化的类型，所以我将其更改为PGpoint.

不幸的是，当我尝试使用此类时，出现以下错误：

SEVERE: Servlet.service() for servlet [appServlet] in context with path 
[/NatureLynxV03] threw exception [Request processing failed; nested exception 
is javax.persistence.PersistenceException: Exception [EclipseLink-3002] 
(Eclipse Persistence Services - 2.6.4.v20160829-44060b6): 
org.eclipse.persistence.exceptions.ConversionException
Exception Description: The object [(-123.456,54.321)], of class 
[class org.postgresql.geometric.PGpoint], from mapping 
[org.eclipse.persistence.mappings.DirectToFieldMapping[location-->CITY.location]] 
with descriptor [RelationalDescriptor(org.abmi.naturelynx.model.City --> 
[DatabaseTable(CITY)])], could not be converted to [class [B].] with root cause
Local Exception Stack: 
Exception [EclipseLink-3002] (Eclipse Persistence Services - 2.6.4.v20160829-44060b6): 
org.eclipse.persistence.exceptions.ConversionException
Exception Description: The object [(-123.456,54.321)], of class 
[class org.postgresql.geometric.PGpoint], from mapping 
[org.eclipse.persistence.mappings.DirectToFieldMapping[location-->CITY.location]] 
with descriptor [RelationalDescriptor(org.abmi.naturelynx.model.City --> 
[DatabaseTable(CITY)])], could not be converted to [class [B]. at ...

我究竟做错了什么？

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