Java 冬眠——”；org.hibernate.LazyInitializationException:无法初始化代理-无会话“；

抱歉，如果我的帖子重复，但我无法从其他主题解决我的问题，所以我创建了此主题。希望有人能帮助我。我正在使用Hibernate、JSF和Glassfish

表关系

这是我的全部代码

customerBean（请求范围）

CustomerProfile.hbm.xml

<p:growl id="msgs" showDetail="true" />
<h:form id="formData">
<p:dataTable id="customers" var="customer_profile" value="#{customerBean.customer}" paginator="true" paginatorPosition="bottom" rows="10"
             paginatorTemplate="{PreviousPageLink} {PageLinks} {NextPageLink} {RowsPerPageDropdown}"
             rowsPerPageTemplate="5,10,15">

    <p:column headerText="Customer ID">
        <h:outputText value="#{customer_profile.customer.customId}" />
    </p:column>

    <p:column headerText="Full Name">
        <h:outputText value="#{customer_profile.fullname}" />
    </p:column>

    <p:column headerText="Phone">
        <h:outputText value="#{customer_profile.phone}" />
    </p:column>

    <p:column headerText="Email">
        <h:outputText value="#{customer_profile.email}" />
    </p:column>

    <p:column headerText="Order">
        <h:outputText value="#{customer_profile.quantityOrder}" />
    </p:column>

    <p:column headerText="Date Created">
        <h:outputText value="#{customer_profile.dateCreated}" />
    </p:column>

    <p:column>
        <p:commandButton id="btnUpdate" oncomplete="updateDialog.show()" icon="ui-icon-search" title="Update" update=":formUpdate">
            <f:setPropertyActionListener value="#{customer_profile}" target="#{customerBean.selectedCustomer}" />
        </p:commandButton>
    </p:column>

</p:dataTable>
</h:form>

<!-- Start formUpdate -->
<h:form id="formUpdate">
<p:dialog header="Customer Details" widgetVar="updateDialog" resizable="false" id="updateDlg" showEffect="fade" hideEffect="explode">

    <h:panelGrid id="display" columns="2" cellpadding="4" style="margin:0 auto;">

        <h:outputText value="Profile ID: " />
        <h:outputLabel value="#{customerBean.selectedCustomer.profile}" />
        <h:outputLabel value="#{customerBean.selectedCustomer.customer.loginName}" />

        <h:outputText value="Full Name: " />
        <h:inputText value="#{customerBean.selectedCustomer.fullname}" />

        <h:outputText value="Phone: " />
        <h:inputText value="#{customerBean.selectedCustomer.phone}" />

        <h:outputText value="Email: " />
        <h:inputText value="#{customerBean.selectedCustomer.email}" />    

        <f:facet name="footer">
            <p:separator />
            <p:commandButton id="btnOK" immediate="true" oncomplete="updateDialog.hide()" action="#{customerBean.btnUpdate}" icon="ui-icon-search" title="Save" value="Save" update=":formData, :msgs" />
            <p:commandButton id="btnCancel" oncomplete="updateDialog.hide()" icon="ui-icon-search" title="Cancel" value="Cancel" />
        </f:facet>
    </h:panelGrid>

</p:dialog>
</h:form>
<!-- End formUpdate -->

<hibernate-mapping>
  <class catalog="catering" name="entities.Customer" schema="dbo" table="customer">
    <id name="customId" type="int">
      <column name="customID"/>
      <generator class="assigned"/>
    </id>
    <property name="loginName" type="string">
      <column name="loginName" not-null="true" unique="true"/>
    </property>
    <property name="password" type="string">
      <column name="password"/>
    </property>
    <set inverse="true" name="customerProfiles">
      <key>
        <column name="customID"/>
      </key>
      <one-to-many class="entities.CustomerProfile"/>
    </set>
    <set inverse="true" name="orderses">
      <key>
        <column name="customID" not-null="true"/>
      </key>
      <one-to-many class="entities.Orders"/>
    </set>
  </class>
</hibernate-mapping>

<hibernate-mapping>
  <class catalog="catering" name="entities.CustomerProfile" schema="dbo" table="customer_profile">
    <id name="profile" type="int">
      <column name="profile"/>
      <generator class="assigned"/>
    </id>
    <many-to-one class="entities.Customer" fetch="select" name="customer">
      <column name="customID"/>
    </many-to-one>
    <property name="gender" type="java.lang.Boolean">
      <column name="gender"/>
    </property>
    <property name="fullname" type="string">
      <column name="fullname" not-null="true"/>
    </property>
    <property name="phone" type="string">
      <column length="15" name="phone" not-null="true"/>
    </property>
    <property name="email" type="string">
      <column name="email"/>
    </property>
    <property name="quantityOrder" type="java.lang.Integer">
      <column name="quantityOrder"/>
    </property>
    <property name="isVegetarian" type="java.lang.Boolean">
      <column name="isVegetarian"/>
    </property>
    <property name="dateCreated" type="date">
      <column name="dateCreated"/>
    </property>
  </class>
</hibernate-mapping>

---

Hibernate在您与其他实体有关系时使用代理对象，此代理仅在需要时帮助从数据库获取信息，因此它的机制称为延迟初始化，并且要获取会话对象所需的信息，列表中的对象客户未初始化，因此您需要执行此操作，因此：

public List<CustomerProfile> findAll(){
        List<CustomerProfile> list_cust = null;
        Session session = HibernateUtil.getSessionFactory().getCurrentSession();
        String sql = "FROM CustomerProfile";
        try{
            session.beginTransaction();
            list_cust = session.createQuery(sql).list();
            for (CustomerProfile cp : list_cust) {
                Hibernate.initialize(cp.getCustomer());
                //or cp.getCustomer().getLoginName();
            }
            session.beginTransaction().commit();
        }catch(Exception e){
            session.beginTransaction().rollback();
        }
        return list_cust;
    }

公共列表findAll（）{
List List_cust=null；
会话会话=HibernateUtil.getSessionFactory（）.getCurrentSession（）；
字符串sql=“来自CustomerProfile”；
试一试{
session.beginTransaction（）；
list_cust=session.createQuery（sql.list（）；
对于（客户档案cp:list_cust）{
初始化（cp.getCustomer（））；
//或cp.getCustomer（）.getLoginName（）；
}
session.beginTransaction（）.commit（）；
}捕获（例外e）{
session.beginTransaction（）.rollback（）；
}
退货清单；
}

这可能不相关，但我发现这种模式有问题

    try{
        session.beginTransaction();
        // do something
        session.beginTransaction().commit();
    }catch(Exception e){
        session.beginTransaction().rollback();
    }

您在开始通话时不应打3次电话。
我的意思是，我怀疑你的代码是否达到了你的目的。

查看此页面顶部以查看此模式的外观

---

上面说“客户在entities.CustomerProfile中拥有私人访问权限”，您可以尝试使用或cp.getCustomer（）.getLoginName（）代替Hibernate.initializeThank现在我可以从customer表中获取信息了。但我还有两个问题。1） 为什么只需要cp.getCustomer（）.getLoginName（）。2） 当我更新客户信息时，在调用代理对象（客户）的getter时，会出现以下错误：“严重：org.hibernate.ObjectNotFoundException:不存在具有给定标识符的行：[entities.CustomerProfile#0]”第一个问题（我更新答案以使用hibernate.initialize）只有在那一刻，hibernate才会在数据库中进行选择，以获取该字段的信息。因此，这可以回答第二个问题客户id字段从未初始化我不确定代理对象在hibernate中如何工作，但在其他ORM中，如eclipse link或openjpa，当您访问代理的字段时，所有对象都已填充，也许这不是hibernate的情况，所以试着用hibernate.initialize来更新我的答案。谢谢迭代部分@peter petrov当我更新客户信息时，出现以下错误“严重：org.hibernate.ObjectNotFoundException:不存在具有给定标识符的行：[entities.CustomerProfile#0]”

<hibernate-mapping>
  <class catalog="catering" name="entities.CustomerProfile" schema="dbo" table="customer_profile">
    <id name="profile" type="int">
      <column name="profile"/>
      <generator class="assigned"/>
    </id>
    <many-to-one class="entities.Customer" fetch="select" name="customer">
      <column name="customID"/>
    </many-to-one>
    <property name="gender" type="java.lang.Boolean">
      <column name="gender"/>
    </property>
    <property name="fullname" type="string">
      <column name="fullname" not-null="true"/>
    </property>
    <property name="phone" type="string">
      <column length="15" name="phone" not-null="true"/>
    </property>
    <property name="email" type="string">
      <column name="email"/>
    </property>
    <property name="quantityOrder" type="java.lang.Integer">
      <column name="quantityOrder"/>
    </property>
    <property name="isVegetarian" type="java.lang.Boolean">
      <column name="isVegetarian"/>
    </property>
    <property name="dateCreated" type="date">
      <column name="dateCreated"/>
    </property>
  </class>
</hibernate-mapping>

public class CustomerProfile  implements java.io.Serializable {
     private int profile;
     private Customer customer;
     private Boolean gender;
     private Serializable fullname;
     private String phone;
     private Serializable email;
     private Integer quantityOrder;
     private Boolean isVegetarian;
     private Serializable dateCreated;

    public CustomerProfile() {
    }


    public CustomerProfile(int profile, Serializable fullname, String phone) {
        this.profile = profile;
        this.fullname = fullname;
        this.phone = phone;
    }
    public CustomerProfile(int profile, Customer customer, Boolean gender, Serializable fullname, String phone, Serializable email, Integer quantityOrder, Boolean isVegetarian, Serializable dateCreated) {
       this.profile = profile;
       this.customer = customer;
       this.gender = gender;
       this.fullname = fullname;
       this.phone = phone;
       this.email = email;
       this.quantityOrder = quantityOrder;
       this.isVegetarian = isVegetarian;
       this.dateCreated = dateCreated;
    }

    public int getProfile() {
        return this.profile;
    }

    public void setProfile(int profile) {
        this.profile = profile;
    }
    public Customer getCustomer() {
        return this.customer;
    }

    public void setCustomer(Customer customer) {
        this.customer = customer;
    }
    public Boolean getGender() {
        return this.gender;
    }

    public void setGender(Boolean gender) {
        this.gender = gender;
    }
    public Serializable getFullname() {
        return this.fullname;
    }

    public void setFullname(Serializable fullname) {
        this.fullname = fullname;
    }
    public String getPhone() {
        return this.phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }
    public Serializable getEmail() {
        return this.email;
    }

    public void setEmail(Serializable email) {
        this.email = email;
    }
    public Integer getQuantityOrder() {
        return this.quantityOrder;
    }

    public void setQuantityOrder(Integer quantityOrder) {
        this.quantityOrder = quantityOrder;
    }
    public Boolean getIsVegetarian() {
        return this.isVegetarian;
    }

    public void setIsVegetarian(Boolean isVegetarian) {
        this.isVegetarian = isVegetarian;
    }
    public Serializable getDateCreated() {
        return this.dateCreated;
    }

    public void setDateCreated(Serializable dateCreated) {
        this.dateCreated = dateCreated;
    }
}

public List<CustomerProfile> findAll(){
        List<CustomerProfile> list_cust = null;
        Session session = HibernateUtil.getSessionFactory().getCurrentSession();
        String sql = "FROM CustomerProfile";
        try{
            session.beginTransaction();
            list_cust = session.createQuery(sql).list();
            for (CustomerProfile cp : list_cust) {
                Hibernate.initialize(cp.getCustomer());
                //or cp.getCustomer().getLoginName();
            }
            session.beginTransaction().commit();
        }catch(Exception e){
            session.beginTransaction().rollback();
        }
        return list_cust;
    }

    try{
        session.beginTransaction();
        // do something
        session.beginTransaction().commit();
    }catch(Exception e){
        session.beginTransaction().rollback();
    }