问题
i am trying to make a 3rd party simple standalone/swing application that uses hibernate to connect on database for another application, so here's what i did:
1- Jars used:
hibernate-core-3.5.1-Final
hibernate-entitymanager-3.5.1-Final
hibernate-jpa-2.0-api-1.0.0.Final
hibernate-annotations-3.5.1-Final
hibernate-commons-annotations-3.2.0.Final
dom4j-1.6.1
slf4j-api-1.6.4
slf4j-log4j12-1.6.4
log4j-1.2.16.jar
commons-collections-3.2
jta-1.1
mysql-connector-java-5.1.14 (or compatible connector with your DB)
commons-logging-1.1.1
commons-collections-3.2
2- hibernate.cfg.xml (it's inside the src folder):
<?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>
<property name="show_sql">true</property>
<property name="format_sql">true</property>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://127.0.0.1:3306/myapp</property>
<property name="connection.username">myuser</property>
<property name="connection.password">mypass</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="current_session_context_class">thread</property>
</session-factory>
</hibernate-configuration>
3- SessionFactoryHelper:
public class SessionFactoryHelper {
private static final SessionFactory sessionFactory;
static {
try {
/*
* Build a SessionFactory object from session-factory configuration
* defined in the hibernate.cfg.xml file. In this file we register
* the JDBC connection information, connection pool, the hibernate
* dialect that we used and the mapping to our hbm.xml file for each
* POJO (Plain Old Java Object).
*/
sessionFactory = new Configuration().configure()
.buildSessionFactory();
} catch (Throwable e) {
System.err.println("Error in creating SessionFactory object."
+ e.getMessage());
throw new ExceptionInInitializerError(e);
}
}
/*
* A static method for other application to get SessionFactory object
* initialized in this helper class.
*/
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}
4- Sample Query:
Session session = SessionFactoryHelper.getSessionFactory()
.getCurrentSession();
session.beginTransaction();
int count = (Integer) session.createSQLQuery(
"select count(*) from users").uniqueResult();
session.getTransaction().commit();
System.out.println("Users Count: " + count);
when running the application, i gets the following exception:
Error in creating SessionFactory object.invalid configuration
Exception in thread "main" java.lang.ExceptionInInitializerError
at com.xeno.xecamp.desktopManagement.SessionFactoryHelper.<clinit>(SessionFactoryHelper.java:24)
at com.myapp.Main.main(Main.java:9)
Caused by: org.hibernate.MappingException: invalid configuration
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1579)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1520)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1506)
at com.xeno.xecamp.desktopManagement.SessionFactoryHelper.<clinit>(SessionFactoryHelper.java:19)
... 1 more
Caused by: org.xml.sax.SAXParseException: Document is invalid: no grammar found.
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:195)
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:131)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:384)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:318)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:250)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl$NSContentDriver.scanRootElementHook(XMLNSDocumentScannerImpl.java:626)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:3103)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:922)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:140)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:511)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:808)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:119)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
at org.dom4j.io.SAXReader.read(SAXReader.java:465)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1576)
... 4 more
can anyone please tell me what's wrong with my configuration ?
回答1:
The problem is not related to Hibernate at all but to the XML structure.
The SAX Reader is set by Hibernate to use validation (org.hibernate.util.XMLHelper#createSAXReader(String,List,EntityResolver)
It goes more less like this:
SAXParserFactory factory = SAXParserFactory.newInstance();
factory.setValidating(true);
factory.setNamespaceAware(true);
Java dosc says
Method setValidating(boolean) - equests DTD validation and causes a failure if no DTD exists. If you only want schema validation and not DTD validation then use setValidating(false).
Your error says clear:
Caused by: org.xml.sax.SAXParseException: Document is invalid: no grammar found.
In this tutorial you will find all required information about hibernate conf file.
to fix it you will need to add:
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
回答2:
You didn't declare any DTD in hibernate.cfg.xml
The message is saying that you are trying to validate the document, but no DTD has been declared, because no DOCTYPE declaration is present.
来源：https://stackoverflow.com/questions/10586512/configure-sessionfactory-in-hibernate-in-standalone-application