Question

我有一个jar库，它有一些带有持久性注释的类。我的jar库中不需要hibernate.cfg.xml，因此我在导入jar的目标项目中创建了hibernate.cfg.xml。我想这个hibernate.cfg.xml使用配置文件，如any.hbm.xml，它指定jar中的类（ jar库中存在any.hbm.xml（我猜这个解决方案在目标项目的hibernate.cfg.xml中带有<mapping resource="any.hbm.xml"/>）。如何为jar库编写any.hbm.xml以及如何在hibernate.cfg.xml中使用它？

我写这个any.hbm.xml：

<?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>
    <mapping class="com.test.Vehicle"/>
    <mapping class="com.test.driver"/>  
</hibernate-mapping>

这个错误：

Caused by: org.hibernate.InvalidMappingException: Unable to read XML
    at org.hibernate.internal.util.xml.MappingReader.readMappingDocument(MappingReader.java:109)
    at org.hibernate.cfg.Configuration.add(Configuration.java:478)
    at org.hibernate.cfg.Configuration.add(Configuration.java:474)
    at org.hibernate.cfg.Configuration.add(Configuration.java:647)
    at org.hibernate.cfg.Configuration.addResource(Configuration.java:730)
    at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:2109)
    at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:2081)
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2061)
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2014)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:1929)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:1908)
    at ir.mersada.db.HibernateUtil.<clinit>(HibernateUtil.java:22)
    ... 1 more
Caused by: org.xml.sax.SAXParseException; lineNumber: 6; columnNumber: 50; Element type "mapping" must be declared.
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:198)
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:134)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:437)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:368)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:325)
    at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.handleStartElement(XMLDTDValidator.java:1906)
    at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.emptyElement(XMLDTDValidator.java:763)
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:353)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2717)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:607)
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:116)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:489)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:835)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:764)
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:123)
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1210)
    at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:568)
    at org.dom4j.io.SAXReader.read(SAXReader.java:465)
    at org.hibernate.internal.util.xml.MappingReader.readMappingDocument(MappingReader.java:78)
    ... 12 more

Answer 1

我认为persistence.xml是更好的选择。

<persistence xsi:schemaLocation="http://java.sun.com/xml/ns/persistence  http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0">
    <persistence-unit name="UNIT_NAME" transaction-type="RESOURCE_LOCAL">
        <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
        <class>com.test.Vehicle</class> 
        <class>com.test.driver</class>
        <properties/>
    </persistence-unit>
</persistence>

Answer 2

SaxParser为您提供了明确的答案：映射元素无效。

但我很困惑。如果你使用注释，并且你不需要在项目中使用cfg.xml，那么如果你不使用cfg.xml那么就是这么简单。

使用Hibernate作为库

2 个答案: