java - IllegalArgumentException，属性的getter方法，避免冗余数据

Question

我正在尝试将新的行程和地点添加到数据库中。它们之间是多对一的关系，一个地方可以分配到多个地方。地点添加正确，但在添加行程期间出现此异常...我知道有很多类似的话题，但没有一个能帮助我解决这个问题。

ERROR: HHH000122: IllegalArgumentException in class: pl.th.java.biuro.hibernate.Place, getter method of property: idPlace
Exception found while adding new trip: IllegalArgumentException occurred calling getter of pl.th.java.biuro.hibernate.Place.idPlace
org.hibernate.PropertyAccessException: IllegalArgumentException occurred calling getter of pl.th.java.biuro.hibernate.Place.idPlace
at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:192)

Hibernate 行程映射:

<hibernate-mapping>
<class name="pl.th.java.biuro.hibernate.Trip" table="Trip">
    <id column="idTrip" name="idTrip" type="int"/>
    <property column="date" name="date" type="date"/>
    <property column="cost" name="cost" type="int"/>
    <property column="profit" name="profit" type="int"/>
    <property column="organisator" name="organisator" type="string"/>
    <property column="period" name="period" type="int"/>
    <property column="food" name="food" type="string"/>
    <property column="transport" name="transport" type="string"/>
    <property column="persons" name="persons" type="int"/>
    <property column="kidsAmount" name="kidsAmount" type="int"/>
    <property column="idHotel" name="idHotel" type="int"/>
    <many-to-one name="idPlace" column="idPlace" class="pl.th.java.biuro.hibernate.Place" not-null="true" />
</class>

hibernate 位置映射:

<hibernate-mapping>
<class name="pl.th.java.biuro.hibernate.Place" table="Place">
    <id column="idPlace" name="idPlace" type="int">
        <generator class="native"/>
    </id>
    <property column="country" name="country" type="string"/>
    <property column="city" name="city" type="string"/>
    <property column="island" name="island" type="string"/>
    <property column="information" name="information" type="string"/>
</class>

旅行等级:

public class Trip {

private int idTrip;
private int idPlace;
private int idHotel;
private Date date;
private int cost;
private int profit;
private String organisator;
private int period;
private String food;
private String transport;
private int persons;
private int kidsAmount;

private String ownerName;
private String ownerLastName;

private Place place;

public Trip() {

}

public Trip(int idTrip, Date date, int cost, int profit, String organisator, int period, String food, String transport, int persons, int kidsAmount) {
    this.idTrip = idTrip;
    this.date = date;
    this.cost = cost;
    this.profit = profit;
    this.organisator = organisator;
    this.period = period;
    this.food = food;
    this.transport = transport;
    this.persons = persons;
    this.kidsAmount = kidsAmount;
}

public Trip(int idTrip, Date date, int cost, int profit, String organisator, int period, String food, String transport, int persons, int kidsAmount, String ownerName, String ownerLastName, Place place) {
    this.idTrip = idTrip;
    this.date = date;
    this.cost = cost;
    this.profit = profit;
    this.organisator = organisator;
    this.period = period;
    this.food = food;
    this.transport = transport;
    this.persons = persons;
    this.kidsAmount = kidsAmount;
    this.ownerName = ownerName;
    this.ownerLastName = ownerLastName;
    this.place = place;
}

/**
 * @return the idTrip
 */
public int getIdTrip() {
    return idTrip;
}

/**
 * @param idTrip the idTrip to set
 */
public void setIdTrip(int idTrip) {
    this.idTrip = idTrip;
}

    /**
 * @return the place
 */
public Place getPlace() {
    return place;
}

/**
 * @param place the place to set
 */
public void setPlace(Place place) {
    this.place = place;
}
And other get/set methods...

地方类:

public class Place {


private int idPlace;
private String country;
private String city;
private String island;
private String information;

public Place() {

}

public Place(String country, String city, String island, String information) {
    this.country = country;
    this.city = city;
    this.island = island;
    this.information = information;
}

/**
 * @return the idPlace
 */
public int getIdPlace() {
    return idPlace;
}

/**
 * @param idPlace the idPlace to set
 */
public void setIdPlace(int idPlace) {
    this.idPlace = idPlace;
}

编辑1添加适当的实体现在对我有用，但我想知道有什么方法可以避免冗余数据？例如，我添加了一个行程和一个与此行程相关的地点 X。当我添加另一个行程时，但在同一个地方 - X，这个地方再次添加到我的数据库中。我怎样才能避免这样的行为？

Answer 1

ERROR: HHH000122: IllegalArgumentException in class: pl.th.java.biuro.hibernate.Place, getter method of property: idPlace

我想你在插入操作时得到了这个。前面的意思是，您正在向 idPlace 列插入非法参数。您正在使用 many-to-one 和 pl.th.java.biuro.hibernate.Place 并插入 int 作为 pl .th.java.biuro.hibernate.Place。您必须将 idPlace 类型从 int 更改为 pl.th.java.biuro.hibernate.Place。

希望对您有所帮助。