I have two tables
xydataa and fm4featuress

this is my application

Xytaaa.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated Mar 19, 2010 4:59:08 PM by Hibernate Tools 3.2.1.GA -->
<hibernate-mapping>
<class catalog="navl" name="test.Xydataa" table="xydataa">
<id column="ID" name="id" type="java.lang.Integer">
<generator class="native"/>
</id>
<property name="longi" type="string">
<column name="Longi"/>
</property>
<property name="lat" type="string">
<column name="Lat"/>
</property>
<property name="altitude" type="int">
<column name="Altitude" not-null="true"/>
</property>
<property name="angle" type="int">
<column name="Angle" not-null="true"/>
</property>
<property name="satellite" type="int">
<column name="Satellite" not-null="true"/>
</property>
<property name="speed" type="int">
<column name="Speed" not-null="true"/>
</property>
<property name="objectId" type="int">
<column name="ObjectId" not-null="true"/>
</property>
<property name="clientId" type="int">
<column name="ClientId" not-null="true"/>
</property>
<property name="gpsTime" type="string">
<column length="19" name="GpsTime" not-null="true"/>
</property>
<property name="location" type="string">
<column name="Location"/>
</property>
<property name="city" type="string">
<column name="City"/>
</property>
<property name="state" type="string">
<column name="State"/>
</property>
<property name="distance" type="string">
<column length="100" name="Distance"/>
</property>
<property name="times" type="timestamp">
<column length="19" name="Times"/>
</property>
<many-to-one name="fm4featuress" class="test.Fm4Featuress" cascade="all" insert="false" update="false">
<column name="ID" not-null="true" />
</many-to-one>
</class>
</hibernate-mapping>


Fm4featuress.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated Mar 19, 2010 4:59:08 PM by Hibernate Tools 3.2.1.GA -->
<hibernate-mapping>
<class catalog="navl" name="test.Fm4Featuress" table="fm4featuress">
<id column="ID" name="id" type="java.lang.Integer">
<generator class="native"/>
</id>
<!-- <id name="id" unsaved-value="any">
<generator class="assigned" />
</id>-->
<property name="DataId" type="int">
<column name="DataId" not-null="true"/>
</property>
<property name="Value" type="int">
<column name="Value" not-null="true"/>
</property>
<set name="xydataa" inverse="true" table="xydataa" lazy="true">
<key>
<column name="ID" not-null="true"/>
</key>
<one-to-many class="test.Xydataa" />
</set>

</class>
</hibernate-mapping>


it's the main file

Session sess = null;
Transaction tr = null;
sess = HibernateUtil.getSessionFactory().openSession();
try
{
tr = sess.beginTransaction();
Date resultdate = new Date(times);
xx = new DecimalNumber(x,7);
yy = new DecimalNumber(y,7);
System.out.println("Inserting xydataa");
Xydataa xy=new Xydataa();
Fm4Featuress fm = new Fm4Featuress();
Set fm1 = new HashSet();
xy.setLongi(xx+"");
xy.setLat(yy+"");
xy.setAltitude(altitude);
xy.setAngle(angle);
xy.setSatellite(satellites);
xy.setSpeed(speed);
xy.setObjectId(objectId);
xy.setClientId(clientId);
xy.setGpsTime(sdf.format(resultdate));
xy.setLocation(location);
xy.setCity(city);
xy.setState(state);
xy.setDistance(distance);
sess.save(xy);
System.out.println("Done");
tr.commit();


for (int i = 0; i < obj.length && obj[i] != 0; i++)
{
tr = sess.beginTransaction();
int all = obj[i] - 1;
System.out.println("Inserting Fm4Featuress");
fm.getXydataa().add(xy);
fm.setXydataa(fm1);
xy.setfm4featuress(fm);
//fm1.add(xy);
fm.setDataId(all);
fm.setValue(obja[i]);
sess.save(fm);
tr.commit();
}

System.out.println("Commit");
}catch(Exception exx)
{
Logger.getLogger(Alldatabase.class.getName()).log(Level.SEVERE, null, exx);

}finally
{
sess.close();
}


i have to use many to one in Xydataa and one to many in Fm4featuress

i run the application i got the following error

SEVERE: Cannot add or update a child row: a foreign key constraint fails (`navl`.`fm4featuress`, CONSTRAINT `lkj` FOREIGN KEY (`ID`) REFERENCES `xydataa` (`ID`) ON DELETE CASCADE)
SEVERE: null
org.hibernate.exception.ConstraintViolationException: could not insert: [test.Fm4Featuress]
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:71)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:40)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2158)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2638)
at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:48)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:250)
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:298)
at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:181)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:107)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187)
at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:172)
at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:535)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:523)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:519)
at tcplistener.Alldatabase.Database(Alldatabase.java:172)
at tcplistener.ModuleHandler.run(ModuleHandler.java:155)
at java.lang.Thread.run(Thread.java:619)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot add or update a child row: a foreign key constraint fails (`navl`.`fm4featuress`, CONSTRAINT `lkj` FOREIGN KEY (`ID`) REFERENCES `xydataa` (`ID`) ON DELETE CASCADE)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:409)
at com.mysql.jdbc.Util.getInstance(Util.java:384)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1041)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3562)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3494)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1960)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2114)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2696)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2105)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2398)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2316)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2301)
at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:73)
at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:33)
... 18 more


i need to get last insert id from the xydataa and put in to the fm4featuress

what is the wrong in my code

pls help me