Trying to build a one-to-many relationship for first time and getting some errors like:


[ERROR] XMLHelper - -Error parsing XML: XML InputStream(19) <org.xml.sax.SAXParseException: Attribute "inverse" must be
declared for element type "set".>org.xml.sax.SAXParseException: Attribute "inverse" must be declared for element type "s
et".
at weblogic.apache.xerces.framework.XMLParser.reportError(XMLParser.java:1292)
at weblogic.apache.xerces.validators.common.XMLValidator.validateElementAndAttributes(XMLValidator.java:3778)
at weblogic.apache.xerces.validators.common.XMLValidator.callStartElement(XMLValidator.java:1242)
at weblogic.apache.xerces.framework.XMLDocumentScanner.scanElement(XMLDocumentScanner.java:1838)
at weblogic.apache.xerces.framework.XMLDocumentScanner$ContentDispatcher.dispatch(XMLDocumentScanner.java:1207)
at weblogic.apache.xerces.framework.XMLDocumentScanner.parseSome(XMLDocumentScanner.java:399)
at weblogic.apache.xerces.framework.XMLParser.parse(XMLParser.java:1138)
at weblogic.xml.jaxp.WebLogicXMLReader.parse(WebLogicXMLReader.java:135)
at weblogic.xml.jaxp.RegistryXMLReader.parse(RegistryXMLReader.java:133)
at org.dom4j.io.SAXReader.read(SAXReader.java:339)
at net.sf.hibernate.cfg.Configuration.addInputStream(Configuration.java:252)
at net.sf.hibernate.cfg.Configuration.addResource(Configuration.java:273)
at net.sf.hibernate.cfg.Configuration.configure(Configuration.java:838)
at net.sf.hibernate.cfg.Configuration.configure(Configuration.java:792)
at net.sf.hibernate.cfg.Configuration.configure(Configuration.java:732)
at net.sf.hibernate.cfg.Configuration.configure(Configuration.java:719)
at Test.main(Test.java:40)

[INFO] Binder - -Mapping class: com.ibm.hibernate_article.Employee -> employee
[INFO] Configuration - -Mapping resource: com/ibm/hibernate_article/Department.hbm.xml
[INFO] Binder - -Mapping class: com.ibm.hibernate_article.Department -> department
[INFO] Configuration - -Configured SessionFactory: HibernateFactory
[INFO] Configuration - -processing one-to-many association mappings
Exception in thread "main" net.sf.hibernate.MappingException: Association references unmapped class: com.ibm.hibernate_a
rticle.Project
at net.sf.hibernate.cfg.Binder.bindCollectionSecondPass(Binder.java:1020)
at net.sf.hibernate.cfg.Binder.bindSetSecondPass(Binder.java:923)
at net.sf.hibernate.cfg.Binder$SetSecondPass.secondPass(Binder.java:1187)
at net.sf.hibernate.cfg.Binder$SecondPass.doSecondPass(Binder.java:1135)
at net.sf.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:497)
at net.sf.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:623)
at Test.main(Test.java:40)




XML Mapping and Java definitions:
---------------------------------------

public class Employee
{
private int employeeId;
private String firstName;
private String lastName;
private String email;
private Employee manager;
private Department department;
private Set projects;
/getter and setters
.....
}


public class Project
{
private int projectId;
private String name;
private Employee employee;
//getter and setters
}


<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD//EN"
"http://hibernate.sourceforge.net/hibernate-mapping.dtd">

<hibernate-mapping>
<class name="com.ibm.hibernate_article.Employee" table="employee">
<id name="employeeId" column="EID">
<generator class="assigned"/>
</id>

<property name="email" column="Email"/>
<property name="firstName" column="FirstName"/>
<property name="lastName" column="LastName"/>

<many-to-one name="department" column="departmentID"/>
<many-to-one name="manager" column="managerEID"/>

<set name="projects" inverse="true" cascade="all" lazy="false">
<key column="EID"/>
<one-to-many class="com.ibm.hibernate_article.Project"/>
</set>

</class>
</hibernate-mapping>





<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD//EN"
"http://hibernate.sourceforge.net/hibernate-mapping.dtd">

<hibernate-mapping>
<class name="com.ibm.hibernate_article.Project" table="project">
<id name="projectId" column="projectId">
<generator class="assigned"/>
</id>

<property name="name" column="Name"/>
<many-to-one name="employee" column="EID"/>
</class>
</hibernate-mapping>

You're using the wrong DTD.