org.hibernate.InvalidMappingException：无法从资源 com/lara/Person.hbm.xml 解析映射文档

Question

Exception in thread "main" org.hibernate.InvalidMappingException: Could not parse mapping document from resource com/lara/Person.hbm.xml
    at org.hibernate.cfg.Configuration.addResource(Configuration.java:616)
    at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:1635)
    at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1603)
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1582)
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1556)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:1476)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:1462)
    at com.lara.Manager.main(Manager.java:15)
Caused by: org.hibernate.InvalidMappingException: Could not parse mapping document from invalid mapping
    at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:549)
    at org.hibernate.cfg.Configuration.addResource(Configuration.java:613)
    ... 7 more
Caused by: org.xml.sax.SAXParseException; lineNumber: 7; columnNumber: 39; Document root element "hibernate-mapping", must match DOCTYPE root "hibernate-configuration".
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.rootElementSpecified(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.handleStartElement(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.startElement(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl$NSContentDriver.scanRootElementHook(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
    at org.dom4j.io.SAXReader.read(SAXReader.java:465)
    at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:546)
    ... 8 more

hibernate.cfg.xml

        <?xml version='1.0' encoding='utf-8'?>
       <!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
        <hibernate-configuration>

    <session-factory>

        <!-- Database connection settings -->
        <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
        <property name="connection.url">jdbc:oracle:thin:@localhost:1521:XE</property>
        <property name="connection.username">system</property>
        <property name="connection.password">system</property>

        <!-- JDBC connection pool (use the built-in) -->
        <property name="connection.pool_size">2</property>

        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.OracleDialect</property>

        <!-- Enable Hibernate's current session context -->
        <property name="current_session_context_class">org.hibernate.context.ManagedSessionContext</property>

        <!-- Disable the second-level cache  -->
        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>

        <!-- Drop and re-create the database schema on startup -->
        <property name="hbm2ddl.auto">create</property>


        <mapping resource="com/lara/Person.hbm.xml"/>

    </session-factory>

     </hibernate-configuration>




Person.hbm.xml
==============
        <?xml version='1.0' encoding='utf-8'?>
        <!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">


        <hibernate-mapping package="com.lara">

    <class name="Person" table="PERSON">
        <id name="id" column="PERSON_ID">
            <generator class="native" />
        </id>
        <property name="age"/>
        <property name="firstname"/>
        <property name="lastname"/>

    </class>

        </hibernate-mapping>


Person.java
=============
        package com.lara;

        public class Person {
    private int id;
    private String firstName;
    private String lastName;
    private int age;

    public int getId() {
        return id;
    }

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

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

      }

Manager.java
=============
        package com.lara;

        import org.hibernate.Session;
        import org.hibernate.SessionFactory;
        import org.hibernate.cfg.Configuration;

        public class Manager {

    public static void main(String[] args) {
        Person p1 = new Person();
        p1.setFirstName("abc");
        p1.setLastName("xyz");
        p1.setAge(22);

        Configuration c1 = new Configuration().configure();

        SessionFactory sf = c1.buildSessionFactory();
        Session s1 = sf.openSession();

        s1.beginTransaction();
        s1.save(p1);
        s1.getTransaction().commit();

        s1.flush();
        s1.close();
        System.out.println("done");
     }
       }

Answer 1

错误消息说（埋在一个大的堆栈跟踪中）：

Document root element "hibernate-mapping", must match DOCTYPE root "hibernate-configuration"

这是因为在您的 Person.hbm.xml 文件中，您有

<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

你应该有的地方

<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

此 DOCTYPE 必须与根标签匹配。

Answer 2

很简单

1.创建构造函数

public Person(){}

这是休眠中的主要内容。它将通过此​​构造函数映射对象（使用 Java 反射概念）

2.了解 dtd。 有两种类型的dtd可用映射dtd和配置dtd

映射-dtd是

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

配置dtd是

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

hibernate.cfg.xml是配置文件，Person.hbm.xml是映射文件 所以更改 Person.hbm.xml 中的 dtd

它会运行。

Answer 3

在某些情况下会出现InvalidmappingException，请仔细阅读

1. 我们将使用 而不是我们使用的 id 标签，那么这个异常肯定会发生。

2. 在 Pojo 类中，您在数据库中声明像“name”这样的数据成员，然后声明“name”就可以了 在映射文件中，你只是简单地写下，我们可以说 就像您在 id 标签名称属性值中声明的任何内容一样，它对应的没有 pojo 类中的数据成员，然后只出现一个错误 InvalidMappingException .

3. SQLGrammarException 当此列名与相应的数据库字段不完全匹配时出现。

Answer 4

我也收到此错误消息。但在我的情况下，班级名称是错误的。根据下面的例子添加正确的包和类名。

<class name="com.project.Question" table="question">