1
我有2个类,Person类与Address类具有ManyToOne关系。当我试图找人时,地址对象里面有空元素,为什么会发生这种情况?懒惰的配置不工作?我可以使用地址级联保存人员对象。休眠获取所有抛出Nullpointerexcepetion ina对象关系
这里是我的代码:
Person类:
public class Person implements java.io.Serializable {
private int idPerson;
private String name;
private String surname;
private String dni;
private Date dateBirth;
private String cellPhone;
private String landPhone;
private String email;
private String discr;
private Address address ;
public Person() {
}
// ¡gett
ERS和setter } 我的地址类:
public class Address implements java.io.Serializable {
private int idAddress;
private City city;
private String street;
private String number;
private Integer apartament;
private int level;
public Address() {
}
//getters an setters
}
我的两个映射文件:
<hibernate-mapping>
<class name="com.efix.model.enterprise.Address" table="address" schema="public">
<id name="idAddress" type="int">
<column name="id_address" />
<generator class="assigned" />
</id>
<many-to-one name="city" class="com.efix.model.enterprise.City" cascade="all" lazy="false">
<column name="id_city" not-null="true" />
</many-to-one>
<property name="street" type="string">
<column name="street" length="60" not-null="true" />
</property>
<property name="number" type="string">
<column name="number" length="6" />
</property>
<property name="apartament" type="java.lang.Integer">
<column name="apartament" />
</property>
<property name="level" type="int">
<column name="level" not-null="true" />
</property>
</class>
</hibernate-mapping>
以上是地址马平,这是我的令人映射:
<!-- Sublcase cliente -->
<subclass name="com.efix.model.enterprise.Client" discriminator-value="Client">
<property name="notes" type="string">
<column name="notes" />
</property>
</subclass>
</class>
</hibernate-mapping>
我NullPointerException异常抛出的代码块:
ClientServiceImpl serviceImpl = new ClientServiceImpl();
for (Client cli : serviceImpl.findAll()) {
System.out.println(cli.getAddress().getNumber());
感谢先进!
请发布错误的整个堆栈跟踪并突出显示解释错误的代码行。而且什么是'ClientServiceImpl'? – Paolo
这是一个例外:2013年10月18日上午9:45:53 com.sun.faces.context.PartialViewContextImpl $ PhaseAwareVisitCallback访问 SEVERE:javax.el.ELException:/enterprises/persons/client.xhtml @ 236,141 value =“ #{clientController.selectedClient.address.number}“:读取类型为com.efix.model.enterprise.Address的$号错误_ $$ _ javassist_0 ClientServiceImpl是调用DAO以将数据保存在D B。我调试该项目,我有地址对象null的引用。 – user1977204
愚蠢的问题,但我需要确定...这个人有一个有效的(非空)地址(我的意思是数据库)? – Paolo