I get the following error. Can anybody help?

log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
%%%% Error Creating SessionFactory %%%%
org.hibernate.MappingException: Error reading resource: htest/Test1.hbm.xml
at org.hibernate.cfg.Configuration.addResource(Configuration.java:452)
at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:1263)
at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1235)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1217)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1184)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1112)
at htest.HibernateSessionFactory.currentSession(HibernateSessionFactory.java:48)
at htest.Hibernatetest.insertRecord(Hibernatetest.java:27)
at htest.Hibernatetest.main(Hibernatetest.java:16)
Caused by: org.hibernate.MappingException: invalid mapping
at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:399)
at org.hibernate.cfg.Configuration.addResource(Configuration.java:449)
... 8 more
Caused by: org.xml.sax.SAXParseException: The content of element type "class" must match "(meta*,subselect?,cache?,synchronize*,comment?,(id|composite-id),discriminator?,natural-id?,(version|timestamp)?,(property|many-to-one|one-to-one|component|dynamic-component|properties|any|map|set|list|bag|idbag|array|primitive-array|query-list)*,((join*,subclass*)|joined-subclass*|union-subclass*),loader?,sql-insert?,sql-update?,sql-delete?,filter*)".
at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
at org.apache.xerces.util.ErrorHandlerWrapper.error(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.dtd.XMLDTDValidator.handleEndElement(Unknown Source)
at org.apache.xerces.impl.dtd.XMLDTDValidator.endElement(Unknown Source)
at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanEndElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.dom4j.io.SAXReader.read(SAXReader.java:465)
at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:398)
... 9 more

The exception is saying that the tags in your <class> tag don't match the DTD:

(meta*,subselect?,cache?,synchronize*,comment?,(id|composite-id),discriminator?,natural-id?,(version|timestamp)?,(property|many-to-one|one-to-one|component|dynamic-component|properties|any|map|set|list|bag|idbag|array|primitive-array|query-list)*,((join*,subclass*)|joined-subclass*|union-subclass*),loader?,sql-insert?,sql-update?,sql-delete?,filter*)

Remember that order is important! That's usually what I've done wrong when I get this error.

I am not clear. Order of what? this is the first time hibernate example so I am not very savy

in htest/Test1.hbm.xml you have:



The nested elements have to match the DTD, which specifies what tags can be nested inside your class, and in what order they can appear. This has nothing to do with Hibernate, it's a straight XML problem.

Read up on XML/DTDs if you still can't figure it out, or post your file and someone can tell you what to change. Good luck.

Thanks Nathan!

Everything is generated by MyEclipse I didn't do anything manually. So, I assumed there shouldn't be any problem.

I deleted and tried to do everything new to see if it works.
The Test1.hbm.xml is in Hibernate/src directory, in tst package. Where Test1.java file also exists.

<hibernate-mapping package="tst">

<class name="Test1" table="test1">

<property name="name" column="name" type="string" />
<property name="city" column="city" type="string" />
</class>

</hibernate-mapping>

My hibernate.hbm.xml looks like this :

<hibernate-configuration>

<session-factory>
<property name="myeclipse.connection.profile">MySql</property>
<property name="connection.url">jdbc:mysql://localhost:3306/test</property>
<property name="connection.username">root</property>
<property name="connection.password">ravi</property>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property><mapping resource="tst/Test1.hbm.xml" />


</session-factory>

</hibernate-configuration>

My HibernateSessionFactory.java references :

private static String CONFIG_FILE_LOCATION = "/tst/hibernate.cfg.xml";

I've never used MyEclipse, but your Test1 class must have either an <id> or <composite-id> tag (for the table primary key), so it's not getting generated correctly.

Thanks Nathan.
That was helpful and I was promoted to a new error :

My table structure is :

mysql> CREATE TABLE paper(ID int(3) NOT NULL AUTO_INCREMENT Primary Key, color V
ARCHAR(10) NULL, size VARCHAR(10) NULL);

Log file :

############# create record
Before getting session
log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
%%%% Error Creating SessionFactory %%%%

org.hibernate.MappingException: could not instantiate id generator
at org.hibernate.id.IdentifierGeneratorFactory.create(IdentifierGeneratorFactory.java:92)
at org.hibernate.mapping.SimpleValue.createIdentifierGenerator(SimpleValue.java:151)
at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:178)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1005)
at tst.HibernateSessionFactory.currentSession(HibernateSessionFactory.java:49)
at tst.htest.insertRecord(htest.java:25)
at tst.htest.main(htest.java:14)
Caused by: org.hibernate.MappingException: Dialect does not support sequences
at org.hibernate.dialect.Dialect.getSequenceNextValString(Dialect.java:430)
at org.hibernate.id.SequenceGenerator.configure(SequenceGenerator.java:65)
at org.hibernate.id.IdentifierGeneratorFactory.create(IdentifierGeneratorFactory.java:88)
... 6 more
java.lang.NullPointerException
at tst.HibernateSessionFactory.currentSession(HibernateSessionFactory.java:56)
at tst.htest.insertRecord(htest.java:25)
at tst.htest.main(htest.java:14)
Exception in thread "main"

My new paper.hbm.xml looks like below :

<hibernate-mapping package="tst">

<class name="Paper" table="paper">
<id name="id" column="ID" type="integer">
<generator class="sequence"/>
</id>

<property name="color" column="color" type="string" />
<property name="size" column="size" type="string" />
</class>

</hibernate-mapping>

you could try



(let hibernate decide what generator to use)

Thanks Nathan!

I fixed it before seeing your reply. But you get the credit for posting response ;=)

--Ravi