Question

当我尝试启动我的hibernate应用程序时，我得到一个InvalidMappingException，但我找不到映射文件语法中的任何错误。补充说明：

类名和列名拼写正确
映射表是视图
数据库系统是DB2
应用程序在

映射文件：

<?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">

<hibernate-mapping package="media.definitions">

    <class name="Category" table="GET_CATEGORY" mutable="false">
        <id name="id" column="ID" type="integer">
            <generator class="identity" />
        </id>
        <property name="name" column="BEZEICHNUNG" type="string" />
        <set name="children" inverse="true" lazy="true">
            <key column="OBERKATEGORIE" type="integer" />
            <index column="INDEX"/>
            <one-to-many class="Category" />
        </set>
        <many-to-one name="parent" column="OBERKATEGORIE" class="Category" 
            not-null="false" cascade="all" />
    </class>

</hibernate-mapping>

错误：

     [java] log4j:WARN Please initialize the log4j system properly.
     [java] Initial SessionFactory creation failed: org.hibernate.InvalidMapping
Exception: Could not parse mapping document from resource media/definitions/Cate
gory.hbm.xml
     [java] org.hibernate.InvalidMappingException: Could not parse mapping docum
ent from resource media/definitions/Category.hbm.xml
     [java]     at org.hibernate.cfg.Configuration.addResource(Configuration.jav
a:569)
     [java]     at media.mediadbimpl.MediaDbImpl.init(MediaDbImpl.java:103)
     [java]     at media.frontend.Media.<init>(Media.java:50)
     [java]     at media.frontend.Media.main(Media.java:156)
     [java] Caused by: org.hibernate.InvalidMappingException: Could not parse ma
pping document from invalid mapping
     [java]     at org.hibernate.cfg.Configuration.addInputStream(Configuration.
java:502)
     [java]     at org.hibernate.cfg.Configuration.addResource(Configuration.jav
a:566)
     [java]     ... 3 more
     [java] Caused by: org.xml.sax.SAXParseException; lineNumber: 14; columnNumb
er: 49; Attribut "type" muss f³r Elementtyp "key" deklariert werden.
     [java]     at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.c
reateSAXParseException(ErrorHandlerWrapper.java:203)
     [java]     at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.e
rror(ErrorHandlerWrapper.java:134)
     [java]     at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.repo
rtError(XMLErrorReporter.java:437)
     [java]     at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.repo
rtError(XMLErrorReporter.java:368)
     [java]     at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.repo
rtError(XMLErrorReporter.java:325)
     [java]     at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.a
ddDTDDefaultAttrsAndValidate(XMLDTDValidator.java:1253)
     [java]     at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.h
andleStartElement(XMLDTDValidator.java:1917)
     [java]     at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.e
mptyElement(XMLDTDValidator.java:763)
     [java]     at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerI
mpl.scanStartElement(XMLNSDocumentScannerImpl.java:356)
     [java]     at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentSc
annerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2786)
     [java]     at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImp
l.next(XMLDocumentScannerImpl.java:606)
     [java]     at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerI
mpl.next(XMLNSDocumentScannerImpl.java:117)
     [java]     at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentSc
annerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)
     [java]     at com.sun.org.apache.xerces.internal.parsers.XML11Configuration
.parse(XML11Configuration.java:848)
     [java]     at com.sun.org.apache.xerces.internal.parsers.XML11Configuration
.parse(XML11Configuration.java:777)
     [java]     at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XM
LParser.java:141)
     [java]     at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.
parse(AbstractSAXParser.java:1213)
     [java]     at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAX
Parser.parse(SAXParserImpl.java:649)
     [java]     at org.dom4j.io.SAXReader.read(SAXReader.java:465)
     [java]     at org.hibernate.cfg.Configuration.addInputStream(Configuration.
java:499)
     [java]     ... 4 more
     [java] Java Result: 1

配置是硬编码的：

    Configuration sessionConf = new Configuration()
        .setProperty("hibernate.connection.driver_class", prop.getProperty("driver"))
        .setProperty("hibernate.connection.url", prop.getProperty("url"))
        .setProperty("hibernate.connection.username", prop.getProperty("user"))
        .setProperty("hibernate.connection.password", prop.getProperty("pw"))
        .setProperty("hibernate.connection.pool_size", "1")
        .setProperty("hibernate.dialect", prop.getProperty("dialect"))
        .setProperty("hibernate.hbm2ddl.auto", "update")
        .setProperty("hibernate.current_session_context_class", "thread")
        .setProperty("show_sql", "false")
        .addResource("media/definitions/Category.hbm.xml");
    sessionFactory = sessionConf.buildSessionFactory();

为什么我会收到此错误？

Answer 1

根据hibernate映射DTD文件 - [hibernate-mapping-3.0.dtd][1]，您的映射文件中有2个问题。

1. 您在映射文件中不应该使用index标记，因为您使用的集合类型为set：

DTD文件说：

声明集合索引的类型和列映射（数组或列表索引，或地图的键）。

<index column="INDEX"/>

因此索引只能用于数组，列表和地图，它不能用于集合

1. 在type标记内使用属性key无效。

根据DTD，密钥标记只能位于type不属于列表的属性列表下方：

<!ELEMENT key (column*)>
    <!ATTLIST key column CDATA #IMPLIED>
    <!ATTLIST key property-ref CDATA #IMPLIED>
    <!ATTLIST key foreign-key CDATA #IMPLIED>
    <!ATTLIST key on-delete (cascade|noaction) "noaction">
    <!ATTLIST key not-null (true|false) #IMPLIED>
    <!ATTLIST key update (true|false) #IMPLIED>
    <!ATTLIST key unique (true|false) #IMPLIED>

因此，要解决您的问题，set的映射应如下所示：

<set name="children" inverse="true" lazy="true">
   <key column="OBERKATEGORIE"/>
   <one-to-many class="Category" />
</set>

Hibernate InvalidMappingException无法在语法中找到错误

1 个答案: