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我在做一個簡單的Hibernate Java應用程序。我有兩個主要實體 - 學生和一個城市，通過多對一的關係連接（許多學生可以來自同一個城市）。類：Java中的IllegalArgumentException Hibernate
@Entity
@Table
public class Student {
@Id
@GeneratedValue
private int id;
private int indexNumber;
private String name;
private String familyName;
private ArrayList <Float> marks;
@ManyToOne
private City city;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public City getCity() {
return city;
}
public void setCity(City city) {
this.city = city;
}
public ArrayList<Float> getMarks() {
return marks;
}
public void setMarks(ArrayList<Float> marks) {
this.marks = marks;
}
public Student(int indexNumber, String name, String familyName,
ArrayList <Float> marks, City city) {
this.indexNumber = indexNumber;
this.name = name;
this.familyName = familyName;
this.marks = marks;
this.city = city;
}
public Student(){
}
public int getIndexNumber() {
return indexNumber;
}
public void setIndexNumber(int indexNumber) {
this.indexNumber = indexNumber;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getFamilyName() {
return familyName;
}
public void setFamilyName(String familyName) {
this.familyName = familyName;
}
@Override
public String toString()
{
return "Index number:"+indexNumber + "\t\t\tName:" + name + "\t\t\tFamily name:" + familyName + "\t\t\tMark:"+ getMarks()+"\n";
}
}
市：
@Entity
public class City {
@Id
@GeneratedValue
private int cityId;
private String name;
@OneToMany
private HashSet <Student> students = new HashSet <Student>(0);
public int getCityId() {
return cityId;
}
public void setCityId(int cityId) {
this.cityId = cityId;
}
public HashSet<Student> getStudents() {
return students;
}
public void setStudents(HashSet<Student> students) {
this.students = students;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public City()
{
}
public City(String name, HashSet <Student> students) {
super();
this.name = name;
this.students = students;
}
}
我的實體映射如下：
Student.hbm.xml：
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="michal.task2.Student" table="Student" catalog="db">
<id name="id" type="int">
<column name="id" />
<generator class="identity" />
</id>
<property name="indexNumber" type="int">
<column name="indexNumber" not-null="true" unique="true" />
</property>
<property name="name" type="string">
<column name="name" length="20" not-null="true"/>
</property>
<property name="familyName" type="string">
<column name="familyName" length="20" not-null="true"/>
</property>
<list name="marks">
<key column="mark" />
<list-index column="index" />
<element type="float"/>
</list>
<many-to-one name="city" class="michal.task2.City" fetch="select">
<column name="city" not-null="true" />
</many-to-one>
</class>
</hibernate-mapping>
City.hbm.xml：
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="michal.task2.City" table="City"
catalog="db">
<id name="cityId" type="int">
<column name="cityId" />
<generator class="identity" />
</id>
<property name="name" type="string">
<column name="name" not-null="true"/>
</property>
<set name="students" table="Student"
inverse="true" lazy="true" fetch="select">
<key>
<column name="studentId" not-null="true" />
</key>
<one-to-many class="michal.task2.Student" />
</set>
</class>
</hibernate-mapping>
的問題是，當我調用它增加了一個新的學生到數據庫的方法：
public static void addStudent(Scanner sc) {
System.out.println("Define parameters of the new Student.\n");
System.out.println("Index number:\n");
int index = sc.nextInt();
System.out.println("Name:\n");
sc.nextLine();
String name = sc.nextLine();
System.out.println("Family name:\n");
String familyName = sc.nextLine();
System.out.println("Marks:\n");
ArrayList <Float> marks = new ArrayList <Float>();
boolean go = true;
while(go){
System.out.println("Enter mark:\n");
float mark = sc.nextFloat();
marks.add(mark);
System.out.println("Add another mark? 1-yes/2-no\n");
int choice = sc.nextInt();
if(choice == 2) go = false;
}
sc.nextLine();
System.out.println("City:\n");
String cityName = sc.nextLine();
City city = new City();
city.setName(cityName);
Student student = new Student(index, name, familyName, marks, city);
city.getStudents().add(student);
session.beginTransaction();
session.save(city); //this line
session.save(student);
session.getTransaction().commit();
System.out.println("Student added!\n");
}
在標記線，我得到一個非法參數異常，以下堆棧跟蹤：
Exception in thread "main" org.hibernate.PropertyAccessException: IllegalArgumentException occurred while calling setter of michal.task2.City.students
at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:119)
at org.hibernate.tuple.entity.AbstractEntityTuplizer.setPropertyValues(AbstractEntityTuplizer.java:707)
at org.hibernate.tuple.entity.PojoEntityTuplizer.setPropertyValues(PojoEntityTuplizer.java:371)
at org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:4232)
at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:283)
at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:195)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:128)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:204)
at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:55)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:189)
at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:49)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)
at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:642)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:635)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:631)
at michal.task2.Main.addStudent(Main.java:93)
at michal.task2.Main.menu(Main.java:41)
at michal.task2.Main.main(Main.java:26)
Caused by: java.lang.IllegalArgumentException: argument type mismatch
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:65)
... 17 more
Caused by: java.lang.IllegalArgumentException: argument type mismatch
請提供與你建立你的表腳本和查詢日：