Mapping Error Hibernate

[Tirthankar Mukherjee]

  package com.entity;
import java.util.*;

public class Department {
	private String deptName;
	private int deptId;
	private Set<String> toolsUsed = new HashSet<String>();
	private Set<Employee> employees = new HashSet<Employee>();
	
	public Set<Employee> getEmployees() {
		return employees;
	}
	public void setEmployees(Set<Employee> employees) {
		this.employees = employees;
	}
	public String getDeptName() {
		return deptName;
	}
	public int getDeptId() {
		return deptId;
	}
	public Set<String> getToolsUsed() {
		return toolsUsed;
	}
	public void setDeptName(String deptName) {
		this.deptName = deptName;
	}
	public void setDeptId(int deptId) {
		this.deptId = deptId;
	}
	public void setToolsUsed(Set<String> toolsUsed) {
		this.toolsUsed = toolsUsed;
	}
	
	
}
  

   package com.entity;
import java.util.HashSet;
import java.util.Set;

public class Employee {

	private int empId;
	private int deptId;
	private String empName;
	private Set<String> computerLanguage = new HashSet<String>();

	public int getEmpId() {
		return empId;
	}

	public int getDeptId() {
		return deptId;
	}

	public String getEmpName() {
		return empName;
	}

	public Set<String> getComputerLanguage() {
		return computerLanguage;
	}

	public void setComputerLanguage(Set<String> computerLanguage) {
		this.computerLanguage = computerLanguage;
	}

	public void setEmpId(int empId) {
		this.empId = empId;
	}

	public void setDeptId(int deptId) {
		this.deptId = deptId;
	}

	public void setEmpName(String empName) {
		this.empName = empName;
	}



}
 

  
package com.entity;
import java.util.HashSet;
import java.util.Set;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;



public class MainClass {

	private static Session session = null;

	private static Session getSession() {
		SessionFactory sf = new Configuration().configure()
				.buildSessionFactory();
		session = sf.openSession();
		return session;
	}
	
	public static void main(String[] args) {
		
		Session session = getSession();
		Transaction trans = session.beginTransaction();
		Department dept = new Department();
		
		dept.setDeptName("NSS");
		Set<String> tools = new HashSet<String>();
		tools.add("Putty");
		tools.add("VMWare");
		tools.add("NetStat");
		dept.setToolsUsed(tools);
		session.save(dept);
		trans.commit();
		
		trans = session.beginTransaction();
		Set<Employee> employees = new HashSet<Employee>();
		
		Employee emp1 = new Employee();
		emp1.setEmpName("Tirtha");
		Set<String> emp1Lang = new HashSet<String>();
		emp1Lang.add("Core Java");
		emp1Lang.add("Hibernate");
		emp1Lang.add("Spring");
		emp1.setComputerLanguage(emp1Lang);
		
		Employee emp2 = new Employee();
		emp2.setEmpName("Debanjana");
		Set<String> emp2Lang = new HashSet<String>();
		emp2Lang.add("Core Java");
		emp2Lang.add("EJB 3");
		emp2Lang.add("Spring");
		emp2.setComputerLanguage(emp2Lang);
		
		employees.add(emp1);
		employees.add(emp2);
		
		dept.setEmployees(employees);
		session.save(dept);
		trans.commit();
		
		System.out.println("Done");

	}

}

  

   
<?xml version="1.0"?>
  <!DOCTYPE hibernate-mapping PUBLIC
  "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
  "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
<hibernate-mapping>
	<class name="com.entity.Employee" table="EMPLOYEE">
		<id name="empId" column="EMP_ID">
			<generator class="sequence">
				<param name="emp_sequence_206819"/>
			</generator>
		</id>
		<property name="empName" column="EMP_NAME" length="32" />
		<set name="computerLanguage" table="EMP_LANG">
			<key column="EMP_ID" />
			<element type="string" column="COMP_LANG" not-null="true" />
		</set>
		<many-to-one name="deptId" class="com.entity.Department" cascade="save-update" column="DEPT_ID"/>
	</class>
</hibernate-mapping>
 

   

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
                                   "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping default-cascade="all">
	<class name="com.entity.Department" table="Department">
		<id name="deptId" column="DEPT_ID">
			<generator class="sequence">
				<param name="dept_sequence_206819"/>
			</generator>
		</id>
		<property name="deptName" column="DEPT_NAME" length="32" />
		<set name="toolsUsed" table="TOOLS_USED_DEPARTMENT">
			<key column="DEPT_ID" />
			<element type="string" column="TOOL_NAME" not-null="true" />
		</set>
		<set name="employees" table="EMPLOYEE" cascade="all">
			<key column="DEPT_ID" />
			<one-to-many class="com.entity.Employee" />
		</set>
	</class>
</hibernate-mapping>
 

  

<?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="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
		<property name="hibernate.default_schema">scott</property>
		<property name="hibernate.connection.url">jdbc:oracle:thin:@127.0.0.1:1521:xe</property>
		<property name="hibernate.connection.username">scott</property>
		<property name="hibernate.connection.password">tiger</property>
		<property name="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</property>
		<property name="show_sql">true</property>
		<property name="format_sql">true</property>
		<property name="hbm2ddl.auto">create</property>
		<mapping resource="com/entity/Department.hbm.xml" />
		<mapping resource="com/entity/Employee.hbm.xml" />
	</session-factory>
</hibernate-configuration>
  

Please help me I am getting an error of :

  Exception in thread "main" org.hibernate.PropertyAccessException: IllegalArgumentException occurred calling getter of com.entity.Department.deptId
	at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:171)
	at org.hibernate.tuple.entity.AbstractEntityTuplizer.getIdentifier(AbstractEntityTuplizer.java:183)
	at org.hibernate.persister.entity.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:3591)
	at org.hibernate.persister.entity.AbstractEntityPersister.isTransient(AbstractEntityPersister.java:3307)
	at org.hibernate.engine.ForeignKeys.isTransient(ForeignKeys.java:181)
	at org.hibernate.event.def.AbstractSaveEventListener.getEntityState(AbstractSaveEventListener.java:512)
	at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:80)
	at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
	at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:507)
	at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:499)
	at org.hibernate.engine.CascadingAction$5.cascade(CascadingAction.java:218)
	at org.hibernate.engine.Cascade.cascadeToOne(Cascade.java:268)
	at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:216)
	at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:169)
	at org.hibernate.engine.Cascade.cascade(Cascade.java:130)
	at org.hibernate.event.def.AbstractSaveEventListener.cascadeBeforeSave(AbstractSaveEventListener.java:431)
	at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:265)
	at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:181)
	at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:121)
	at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187)
	at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:172)
	at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:94)
	at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
	at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:507)
	at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:499)
	at org.hibernate.engine.CascadingAction$5.cascade(CascadingAction.java:218)
	at org.hibernate.engine.Cascade.cascadeToOne(Cascade.java:268)
	at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:216)
	at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:169)
	at org.hibernate.engine.Cascade.cascadeCollectionElements(Cascade.java:296)
	at org.hibernate.engine.Cascade.cascadeCollection(Cascade.java:242)
	at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:219)
	at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:169)
	at org.hibernate.engine.Cascade.cascade(Cascade.java:130)
	at org.hibernate.event.def.AbstractFlushingEventListener.cascadeOnFlush(AbstractFlushingEventListener.java:131)
	at org.hibernate.event.def.AbstractFlushingEventListener.prepareEntityFlushes(AbstractFlushingEventListener.java:122)
	at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:65)
	at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26)
	at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
	at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:338)
	at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
	at com.entity.MainClass.main(MainClass.java:64)
Caused by: java.lang.IllegalArgumentException: object is not an instance of declaring class
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:145)
	... 41 more
  

Thanks in Advance .... please help ...

[Christian Dillinger]

Please do not post the same question to multiple forums...

The problem is that you try to map to int-Kex but tell Hibernate that its a Department:
<many-to-one name="deptId" class="com.entity.Department" cascade="save-update" column="DEPT_ID"/>

Have a look at the Hibernate docs that shows you basic examples.

[Tirthankar Mukherjee]

Thanks Christian, actually I became very desperate to find my answer, so I posted the same question in different forums. Thanks for clearing my concept, actually I misunderstood some of the examples that I have seen. Thanks a lot.