问题：

无法自动连接字段：private org.Hibernate.sessionFactory Hibernate and Spring

黄意智

2023-03-14

我在我的服务器Tomcat上部署project后遇到了这个错误。我发现了许多类似的问题，但我没有找到我的问题的答案。

ApplicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="
    http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/aop 
    http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
    http://www.springframework.org/schema/tx    
    http://www.springframework.org/schema/tx/spring-tx.xsd
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context-4.2.xsd
    http://www.springframework.org/schema/util
    http://www.springframework.org/schema/util/spring-util.xsd">

    <context:property-placeholder location="classpath:config.properties" />
    <context:component-scan base-package="ua.com.goit.gojava7.kikstarter.dao.database" />

    <bean id="basicDataSource" class="org.apache.commons.dbcp2.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${jdbc.driverClassName}" />
        <property name="url" value="${jdbc.dataBaseUrl}" />
        <property name="username" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />
    </bean>

    <tx:annotation-driven transaction-manager="transactionManager" />
    <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>

    <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">

        <property name="dataSource">
            <ref bean="basicDataSource" />
        </property>

        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</prop>
                <prop key="hibernate.show_sql">false</prop>
            </props>
        </property>

        <property name="annotatedClasses">
            <list>
                <value>ua.com.goit.gojava7.kikstarter.domain.Quote</value>
                <value>ua.com.goit.gojava7.kikstarter.domain.Category</value>
                <value>ua.com.goit.gojava7.kikstarter.domain.Project</value>
                <value>ua.com.goit.gojava7.kikstarter.domain.Payment</value>
                <value>ua.com.goit.gojava7.kikstarter.domain.Reward</value>
            </list>
        </property>
    </bean>

CategoryDaoDbImpl类

package ua.com.goit.gojava7.kikstarter.dao.database;

import java.util.List;

import org.hibernate.SessionFactory;
import org.hibernate.Session;
import org.hibernate.criterion.Restrictions;
import org.hibernate.Criteria;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

import ua.com.goit.gojava7.kikstarter.dao.CategoryDao;
import ua.com.goit.gojava7.kikstarter.domain.Category;

@Repository
public class CategoryDaoDbImpl implements CategoryDao {

    @Autowired
    private SessionFactory sessionFactory;

    @SuppressWarnings("unchecked")
    @Transactional
    @Override
    public List<Category> getAll() {
        Session session=sessionFactory.openSession();

        Criteria criteria=session.createCriteria(Category.class);
        List<Category> categories=criteria.list();

        session.close();
        return categories;
    }

    @Transactional
    @Override
    public Category getCategory(int id) {
        Session session=sessionFactory.openSession();

        Criteria criteria=session.createCriteria(Category.class);
        criteria.add(Restrictions.eq("id", id));
        Category category=(Category) criteria.uniqueResult();

        session.close();
        return category;
    }
}

Category类

package ua.com.goit.gojava7.kikstarter.domain;

import java.util.Set;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;

@Entity
@Table(name = "categories")
public class Category {

    @Id
    @SequenceGenerator(name = "SEQ_GEN", sequenceName = "seq_id", allocationSize = 10)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "SEQ_GEN")
    private int id;

    @Column(name = "name")
    private String name;

    @OneToMany
    private Set<Project> projects;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public Set<Project> getProjects() {
        return projects;
    }

    public void setProjects(Set<Project> projects) {
        this.projects = projects;
    }

    @Override
    public String toString() {
        return "ID: " + id + "; Name: " + name;
    }
}

package ua.com.goit.gojava7.kikstarter.domain;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;

@Entity
@Table(name = "projects")
public class Project {

    @Id
    @SequenceGenerator(name = "SEQ_GEN", sequenceName = "seq_id", allocationSize = 10)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "SEQ_GEN")
    private int id;

    @ManyToOne
    @JoinColumn(name = "category_id")
    private Category category;

    @Column(name = "name")
    private String name;

    @Column(name = "general_description")
    private String generalDescription;

    @Column(name = "full_description")
    private String fullDescription;

    @Column(name = "video_link")
    private String videoLink;

    @Column(name = "required_sum")
    private int requiredSum;

    @Column(name = "collected_sum")
    private int collectedSum;

    @Column(name = "days_left")
    private int endOfDays;

    public int getId() {
        return id;
    }

    public Category getCategory() {
        return category;
    }

    public String getName() {
        return name;
    }

    public String getGenerelDescription() {
        return generalDescription;
    }

    public String getFullDescription() {
        return fullDescription;
    }

    public String getVideoLink() {
        return videoLink;
    }

    public int getRequiredSum() {
        return requiredSum;
    }

    public int getCollectedSum() {
        return collectedSum;
    }

    public int getEndOfDays() {
        return endOfDays;
    }

    public void setId(int id) {
        this.id = id;
    }

    public void setCategory(Category category) {
        this.category = category;
    }

    public void setName(String projectName) {
        this.name = projectName;
    }

    public void setGeneralDescription(String generalDescription) {
        this.generalDescription = generalDescription;
    }

    public void setFullDescription(String fullDescription) {
        this.fullDescription = fullDescription;
    }

    public void setVideoLink(String videoLink) {
        this.videoLink = videoLink;
    }

    public void setRequiredSum(int requiredSum) {
        this.requiredSum = requiredSum;
    }

    public void setCollectedSum(int collectedAmount) {
        this.collectedSum = collectedAmount;
    }

    public void setSumFromUser(int enteredAmount) {
        collectedSum += enteredAmount;
    }

    public void setEndOfDays(int endOfDays) {
        this.endOfDays = endOfDays;
    }

    @Override
    public String toString() {
        return "Project: name: " + name + "; general description: " + generalDescription + "; full description: "
            + fullDescription + "; video link: " + videoLink + "; required sum: " + requiredSum
            + "; collected sum: " + collectedSum + "; days left: " + endOfDays;
    }
}

共有1个答案

齐阎宝

2023-03-14

堆栈。通过向堆栈中添加“frames”来跟踪代码执行。每次调用一个方法，一个新的帧就会被“推”到堆栈上。这就是当抛出异常时，您能够获取导致异常的调用方法（称为堆栈跟踪）的方法。
链接异常。在Java中，当抛出异常时，可以指定异常的“原因”。这是跟踪“导致”正在引发的新异常的异常的堆栈跟踪的一种方法。

Spring框架因大量使用链接异常而臭名昭著（我个人认为这是一个好的品质），这使得读取从框架返回的错误变得有点棘手。使它变得棘手的是，堆栈跟踪的顺序和链接异常的顺序本质上是颠倒的。

所以看着你的具体例子（并将其简化以调用出你需要注意的结构），我们看到：

BeanCreationException: Error creating bean with name 'categoryDaoDbImpl': Injection of autowired dependencies failed; **nested exception is**
|
|-> BeanCreationException: Could not autowire field: private SessionFactory CategoryDaoDbImpl.sessionFactory; **nested exception is**
    |
    |-> BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [applicationContext.xml]: Invocation of init method failed; **nested exception is**
        |
        |-> AnnotationException: @OneToOne or @ManyToOne on Payment.projectId references an unknown entity: int at
                org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334) at 
                org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1214) at
                org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543) at 
                org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) at 
                org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:305) at 
                org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) at 
                org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:301) at 
                org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:196) at 
                org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772) at 
                org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:835) at 
                org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:537) at 
                org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:446) at 
                org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:328) at 
                org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)

当您看到嵌套异常时，您正在处理链接异常。因此，您实际遇到的是一个引起问题的异常，即payment对象上的映射问题；特别是projectID字段。

所以当你问

Could not autowire field：private org.hibernate.sessionFactory和错误创建名为“category daodbimpl”的bean我必须在文件applicationcontext.xml中创建名为“category daodbimpl”的bean？

希望现在很清楚，您不必对“前”三个BeanCreationException做任何事情，因为它们都是由根AnnotationException引起的

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