Question

Hibernate无法连接到我的本地数据库。我在使用Hibernate 5的不同项目中使用了相同的配置文件，并且它工作正常。但是我必须继续在这个中使用Hibernate 3.0.5。

在Eclipse 4.4.1上使用Maven 2.2.1和Hibernate 3.0.5设置了projekt。它在读取hibernate.cfg.xml并尝试连接到数据库时失败。到目前为止，代码只尝试构建会话工厂，这就是为什么我还没有任何映射文件。

的pom.xml：

    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.materna.azubi.pi</groupId>
  <artifactId>Parkplatzverwaltung</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>Parkplatzverwaltung</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <PostgreSQLVersion>9.3-1103-jdbc41</PostgreSQLVersion>
    <HibernateVersion>3.0.5</HibernateVersion>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.postgresql</groupId>
        <artifactId>postgresql</artifactId>
        <version>${PostgreSQLVersion}</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate</artifactId>
        <version>${HibernateVersion}</version>
    </dependency>
  </dependencies>
</project>

主要课程：

import org.hibernate.SessionFactory;
public class Testclass {    
    public static void main(String args[])  {
        SessionFactory factory = Connect.getSessionFactory();
    }
}

hibernate.cfg.xml中：

    <?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration SYSTEM 
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
   <session-factory>
   <property name="hibernate.dialect">
        org.hibernate.dialect.PostgreSQLDialect
   </property>
   <property name="hibernate.connection.driver_class">
        org.postgresql.Driver
   </property>


   <property name="hibernate.connection.url">
        jdbc:postgresql://localhost/postgres
   </property>
   <property name="hibernate.connection.username">
      azubi
   </property>
   <property name="hibernate.connection.password">
      azubi
   </property>

   <!-- List of XML mapping files -->
   <mapping resource="ProviderImpl.hbm.xml"/>

</session-factory>
</hibernate-configuration>

堆栈追踪：

Nov 16, 2015 1:52:03 PM org.hibernate.cfg.Environment <clinit>
INFORMATION: Hibernate 3.0.5
Nov 16, 2015 1:52:03 PM org.hibernate.cfg.Environment <clinit>
INFORMATION: hibernate.properties not found
Nov 16, 2015 1:52:03 PM org.hibernate.cfg.Environment <clinit>
INFORMATION: using CGLIB reflection optimizer
Nov 16, 2015 1:52:03 PM org.hibernate.cfg.Environment <clinit>
INFORMATION: using JDK 1.4 java.sql.Timestamp handling
Nov 16, 2015 1:52:03 PM org.hibernate.cfg.Configuration configure
INFORMATION: configuring from resource: /hibernate.cfg.xml
Nov 16, 2015 1:52:03 PM org.hibernate.cfg.Configuration getConfigurationInputStream
INFORMATION: Configuration resource: /hibernate.cfg.xml
Nov 16, 2015 1:52:04 PM org.hibernate.cfg.Configuration doConfigure
SCHWERWIEGEND: problem parsing configuration/hibernate.cfg.xml
org.dom4j.DocumentException: Connection refused: connect Nested exception: Connection refused: connect
    at org.dom4j.io.SAXReader.read(SAXReader.java:484)
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1168)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:1112)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:1098)
    at mypackage.Connect.buildSessionFactory(Connect.java:10)
    at mypackage.Connect.<clinit>(Connect.java:7)
    at mypackage.impl.Testclass.main(Testclass.java:16)
Nested exception: 
java.net.ConnectException: Connection refused: connect
    at java.net.DualStackPlainSocketImpl.connect0(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at java.net.Socket.connect(Socket.java:538)
    at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
    at sun.net.www.http.HttpClient.<init>(HttpClient.java:211)
    at sun.net.www.http.HttpClient.New(HttpClient.java:308)
    at sun.net.www.http.HttpClient.New(HttpClient.java:326)
    at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1168)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1104)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:998)
    at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:932)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1512)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1440)
    at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(XMLEntityManager.java:646)
    at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startEntity(XMLEntityManager.java:1300)
    at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startDTDEntity(XMLEntityManager.java:1267)
    at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.setInputSource(XMLDTDScannerImpl.java:263)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.dispatch(XMLDocumentScannerImpl.java:1164)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.next(XMLDocumentScannerImpl.java:1050)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:964)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:606)
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:117)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
    at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:649)
    at org.dom4j.io.SAXReader.read(SAXReader.java:465)
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1168)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:1112)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:1098)
    at mypackage.Connect.buildSessionFactory(Connect.java:10)
    at mypackage.Connect.<clinit>(Connect.java:7)
    at mypackage.impl.Testclass.main(Testclass.java:16)

SessionFactory creation failed.org.hibernate.HibernateException: problem parsing configuration/hibernate.cfg.xml
Exception in thread "main" java.lang.ExceptionInInitializerError
    at mypackage.Connect.buildSessionFactory(Connect.java:13)
    at mypackage.Connect.<clinit>(Connect.java:7)
    at mypackage.impl.Testclass.main(Testclass.java:16)
Caused by: org.hibernate.HibernateException: problem parsing configuration/hibernate.cfg.xml
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1173)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:1112)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:1098)
    at mypackage.Connect.buildSessionFactory(Connect.java:10)
    ... 2 more
Caused by: org.dom4j.DocumentException: Connection refused: connect Nested exception: Connection refused: connect
    at org.dom4j.io.SAXReader.read(SAXReader.java:484)
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1168)
    ... 5 more

到目前为止，我已经尝试在cfg.xml中找到任何错误，为什么它可能无法与maven一起使用，以及Hibernate 5和Hibernate 3之间是否存在一些我忽略的差异。我曾经有过

<property name="hibernate.dialect">

而不是

<property name="dialect">

但这并没有改变任何事情。

异常的根在Testclass第16行：

SessionFactory factory = Connect.getSessionFactory();

被调用的类看起来像这样：

public class Connect {
    private static final SessionFactory sessionFactory = buildSessionFactory();
    private static SessionFactory buildSessionFactory() {
        try{
            return new Configuration().configure().buildSessionFactory();
        }catch (Throwable ex) {
            System.err.println("SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }
    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }
    public static void shutdown() {
        getSessionFactory().close();
    }
}

我现在知道，我的程序可以访问互联网，而且dtd可以通过互联网访问。我希望你能帮忙！

Answer 1

像3.0.5这样的早期版本的hibernate不支持很好地导入.dtd文件。

使用sourceforge liks可以很容易地解决这个问题。

对于hibernate.cfg.xml，请使用：

<!DOCTYPE hibernate-configuration SYSTEM 
"hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

对于任何class.hbm.xml文件，请使用：

<!DOCTYPE hibernate-mapping SYSTEM 
"hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

如果仍然出现错误，hibernate会告诉你它在哪里查找.dtd文件，你可以将它们复制到那里。

Hibernate 3.0.5无法连接到数据库

1 个答案: