期待 IdClass 映射？答案

【问题标题】：expecting IdClass mapping?期待 IdClass 映射？
【发布时间】：2019-05-17 05:49:19
【问题描述】：

我的 java 模型包含 3 个主键，TokensPK 类显示我的主键。

hbm.xml 文件，标签composite-id 显示这些 PK 并显示 2 类之间的关系，但我无法理解

public class UserTokens {
    private String userId;
    private String loginProvider;
    private String name;
    private String value;


    public String getUserId() {
        return userId;
    }

    public void setUserId(String userId) {
        this.userId = userId;
    }


    public String getLoginProvider() {
        return loginProvider;
    }

    public void setLoginProvider(String loginProvider) {
        this.loginProvider = loginProvider;
    }


    public String getName() {
        return name;
    }

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


    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }

}

和


public class TokensPK implements Serializable {

    private String userId;
    private String loginProvider;
    private String name;


    public String getUserId() {
        return userId;
    }

    public void setUserId(String userId) {
        this.userId = userId;
    }


    public String getLoginProvider() {
        return loginProvider;
    }

    public void setLoginProvider(String loginProvider) {
        this.loginProvider = loginProvider;
    }


    public String getName() {
        return name;
    }

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

}

这是我的 hbm.xml 文件

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>

    <class name="oauth.identity.IdentityModel.UserTokens" table="UserTokens" schema="dbo" catalog="BBB">

        <composite-id mapped="true" class="oauth.identity.IdentityModel.TokensPK">
            <key-property name="userId">
                <column name="UserId" sql-type="nvarchar(450)" length="450"/>
            </key-property>
            <key-property name="loginProvider">
                <column name="LoginProvider" sql-type="nvarchar(450)" length="450"/>
            </key-property>
            <key-property name="name">
                <column name="Name" sql-type="nvarchar(450)" length="450"/>
            </key-property>
        </composite-id>


        <property name="value">
            <column name="Value" sql-type="nvarchar(max)" length="2147483647" not-null="true"/>
        </property>

    </class>
</hibernate-mapping>

还有我的 ApplicationContext

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
 ">



    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.microsoft.sqlserver.jdbc.SQLServerDriver" />
        <property name="url" value="jdbc:sqlserver://Data Source=localhost;Initial Catalog=DB;Integrated Security=True" />
        <property name="username" value="sa" />
        <property name="password" value="123" />
    </bean>



    <bean id="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />

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

        <property name="mappingResources">
            <list>
                <value>UserTokens.hbm.xml</value>
            </list>
        </property>


    </bean>
</beans>

我知道表有 3 个主表，但我不明白我的错在哪里。当我想用这个模型创建数据库时，这给了我一个错误，我无法解决它


org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [ApplicationContext.xml]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: expecting IdClass mapping
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1783) ~[spring-beans-5.2.0.M2.jar:5.2.0.M2]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) ~[spring-beans-5.2.0.M2.jar:5.2.0.M2]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) ~[spring-beans-5.2.0.M2.jar:5.2.0.M2]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.2.0.M2.jar:5.2.0.M2]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.0.M2.jar:5.2.0.M2]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.2.0.M2.jar:5.2.0.M2]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.2.0.M2.jar:5.2.0.M2]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:849) ~[spring-beans-5.2.0.M2.jar:5.2.0.M2]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877) ~[spring-context-5.2.0.M2.jar:5.2.0.M2]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549) ~[spring-context-5.2.0.M2.jar:5.2.0.M2]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) ~[spring-boot-2.2.0.M3.jar:2.2.0.M3]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:782) ~[spring-boot-2.2.0.M3.jar:2.2.0.M3]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:404) ~[spring-boot-2.2.0.M3.jar:2.2.0.M3]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:319) ~[spring-boot-2.2.0.M3.jar:2.2.0.M3]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1275) ~[spring-boot-2.2.0.M3.jar:2.2.0.M3]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1263) ~[spring-boot-2.2.0.M3.jar:2.2.0.M3]
    at oauth.identity.IdentityApplication.main(IdentityApplication.java:12) ~[classes/:na]
Caused by: java.lang.IllegalArgumentException: expecting IdClass mapping
    at org.hibernate.metamodel.internal.AttributeFactory$3.resolveMember(AttributeFactory.java:977) ~[hibernate-core-5.4.2.Final.jar:5.4.2.Final]
    at org.hibernate.metamodel.internal.AttributeFactory$5.resolveMember(AttributeFactory.java:1035) ~[hibernate-core-5.4.2.Final.jar:5.4.2.Final]
    at org.hibernate.metamodel.internal.AttributeFactory.determineAttributeMetadata(AttributeFactory.java:450) ~[hibernate-core-5.4.2.Final.jar:5.4.2.Final]
    at org.hibernate.metamodel.internal.AttributeFactory.buildIdAttribute(AttributeFactory.java:139) ~[hibernate-core-5.4.2.Final.jar:5.4.2.Final]
    at org.hibernate.metamodel.internal.MetadataContext.buildIdClassAttributes(MetadataContext.java:389) ~[hibernate-core-5.4.2.Final.jar:5.4.2.Final]
    at org.hibernate.metamodel.internal.MetadataContext.applyIdMetadata(MetadataContext.java:319) ~[hibernate-core-5.4.2.Final.jar:5.4.2.Final]
    at org.hibernate.metamodel.internal.MetadataContext.wrapUp(MetadataContext.java:222) ~[hibernate-core-5.4.2.Final.jar:5.4.2.Final]
    at org.hibernate.metamodel.internal.MetamodelImpl.initialize(MetamodelImpl.java:274) ~[hibernate-core-5.4.2.Final.jar:5.4.2.Final]
    at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:294) ~[hibernate-core-5.4.2.Final.jar:5.4.2.Final]
    at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:462) ~[hibernate-core-5.4.2.Final.jar:5.4.2.Final]
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:708) ~[hibernate-core-5.4.2.Final.jar:5.4.2.Final]
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:724) ~[hibernate-core-5.4.2.Final.jar:5.4.2.Final]
    at org.springframework.orm.hibernate5.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:615) ~[spring-orm-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.orm.hibernate5.LocalSessionFactoryBean.afterPropertiesSet(LocalSessionFactoryBean.java:599) ~[spring-orm-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1842) ~[spring-beans-5.2.0.M2.jar:5.2.0.M2]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1779) ~[spring-beans-5.2.0.M2.jar:5.2.0.M2]
    ... 16 common frames omitted

【问题讨论】：

不要混用 hbm.xml 映射和注解映射。选择其中之一。此外，我个人不喜欢对 getter/setter 方法进行注释。我更喜欢将它们直接放在田野上，这样就不会发生错误将它们放在错误的地方
为什么你还有一个 hbm.xml。你不需要那个
我是 java 新手，但我知道 hbm.xml 是必要的。你的意思是有办法在没有 hbm.xml 文件的情况下创建数据库？？
如果您使用注释，则不需要 @sahraair hbm.xml。仅使用基于 xml 的配置或基于注解的配置之一进行休眠
我的朋友们感谢您的帮助。但是当我删除注释时，它给了我同样的错误

标签： java hibernate spring-boot

【解决方案1】：

如下更新您的实体：

    public class UserTokens  implements Serializable{


    private String userId;
    private String loginProvider;
    private String name;
    private String value;


    public String getUserId() {
        return userId;
    }

    public void setUserId(String userId) {
        this.userId = userId;
    }

    public String getLoginProvider() {
        return loginProvider;
    }

    public void setLoginProvider(String loginProvider) {
        this.loginProvider = loginProvider;
    }

    public String getName() {
        return name;
    }

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

    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }
}

您的实体类应该实现 Serializable。另外，在映射文件中替换以下内容

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>

    <class name="oauth.identity.IdentityModel.UserTokens" >

        <composite-id >
            <key-property name="userId" column="UserId" />
            <key-property name="loginProvider" column="LoginProvider" />
            <key-property name="name" column="Name" />
        </composite-id>


        <property name="value">
            <column name="Value" />
        </property>

    </class>
</hibernate-mapping>

【讨论】：

仍然无法正常工作。你有解决类似问题的示例链接吗？还是github中的项目？
@sahraair 试试这个。可以参考onlinetutorialspoint.com/hibernate/…
我试过了，但还是不行
非常感谢 :)
如果你使用spring boot，为什么还要在applicationcontext.xml中编写所有这些配置？