Hibernate version:
Hibernate 2.1

Mapping documents:
<?xml version="1.0"?>

<!DOCTYPE hibernate-mapping
PUBLIC "-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">


<hibernate-mapping>

<class
name="xpetstore.domain.Order"
table="T_ORDER"
>

<id name="orderId" type="long" column="ORDERID">
<meta attribute="scope-set">protected</meta>
<generator class="identity"/>
</id>

<component
name="address"
class="xpetstore.domain.Address"
>
<property
name="city"
type="java.lang.String"
column="city"
length="25"
not-null="false"
unique="false"
/>

<property
name="country"
type="java.lang.String"
column="country"
length="3"
not-null="false"
unique="false"
/>

<property
name="state"
type="java.lang.String"
column="state"
length="3"
not-null="false"
unique="false"
/>

<property
name="street1"
type="java.lang.String"
column="street1"
length="50"
not-null="false"
unique="false"
/>

<property
name="street2"
type="java.lang.String"
column="street2"
length="50"
not-null="false"
unique="false"
/>

<property
name="zipcode"
type="java.lang.String"
column="zipcode"
length="10"
not-null="false"
unique="false"
/>

</component>

<component
name="creditCard"
class="xpetstore.domain.CreditCard"
>
<property
name="expiryDate"
type="java.lang.String"
column="creditCardExpiryDate"
length="10"
not-null="false"
unique="false"
/>

<property
name="number"
type="java.lang.String"
column="creditCardNumber"
length="25"
not-null="false"
unique="false"
/>

<property
name="type"
type="java.lang.String"
column="creditCardType"
length="25"
not-null="false"
unique="false"
/>

</component>

<many-to-one
name="customer"
class="xpetstore.domain.Customer"
column="customer_fk"
not-null="false"
unique="false"
cascade="none"
outer-join="auto"
/>

<property
name="orderDate"
type="java.util.Date"
column="orderDate"
not-null="false"
unique="false"
/>

<set
name="orderItems"
lazy="true"
inverse="false"
cascade="all"
sort="unsorted"
>

<key
column="order_fk"
>
</key>

<one-to-many
class="xpetstore.domain.OrderItem"
/>

</set>

<property
name="status"
type="java.lang.String"
column="status"
length="10"
not-null="false"
unique="false"
/>

<!--
To add non XDoclet properties, create a file named
hibernate-properties-Order.xml
containing the additional properties and place it in your merge dir.
-->

</class>

</hibernate-mapping>


Full stack trace of any exception that occurs:
could not insert: [xpetstore.domain.Order]<p><small><small><pre>net.sf.hibernate.exception.ConstraintViolationException: could not insert: [xpetstore.domain.Order]
at net.sf.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:62)
at net.sf.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:29)
at net.sf.hibernate.persister.AbstractEntityPersister.convert(AbstractEntityPersister.java:1331)
at net.sf.hibernate.persister.EntityPersister.insert(EntityPersister.java:540)
at net.sf.hibernate.persister.EntityPersister.insert(EntityPersister.java:426)
at net.sf.hibernate.impl.ScheduledIdentityInsertion.execute(ScheduledIdentityInsertion.java:28)
at net.sf.hibernate.impl.SessionImpl.execute(SessionImpl.java:2449)
at net.sf.hibernate.impl.SessionImpl.doSave(SessionImpl.java:943)
at net.sf.hibernate.impl.SessionImpl.doSave(SessionImpl.java:868)
at net.sf.hibernate.impl.SessionImpl.saveWithGeneratedIdentifier(SessionImpl.java:786)
at net.sf.hibernate.impl.SessionImpl.save(SessionImpl.java:749)
at xpetstore.web.webwork.action.order.CreateOrderAction.doExecute(CreateOrderAction.java:83)
at webwork.action.ActionSupport.execute(ActionSupport.java:151)
at xpetstore.web.webwork.action.BaseAction.execute(BaseAction.java:91)
at webwork.dispatcher.GenericDispatcher.executeAction(GenericDispatcher.java:131)
at webwork.dispatcher.ServletDispatcher.service(ServletDispatcher.java:174)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:427)
at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:816)
at xpetstore.web.filter.SignOnFilter.doFilter(SignOnFilter.java:127)
at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:807)
at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:118)
at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:52)
at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:807)
at org.mortbay.jetty.servlet.JSR154Filter.doFilter(JSR154Filter.java:169)
at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:807)
at org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:488)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:569)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1482)
at org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:624)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1434)
at org.mortbay.http.HttpServer.service(HttpServer.java:896)
at org.mortbay.http.HttpConnection.service(HttpConnection.java:814)
at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:981)
at org.mortbay.http.HttpConnection.handle(HttpConnection.java:831)
at org.mortbay.http.SocketListener.handleConnection(SocketListener.java:244)
at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:366)
at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)
Caused by: SQL Exception: Column 'ORDERID' cannot accept a NULL value.
at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Util.java)
at org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(TransactionResourceImpl.java)
at org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(TransactionResourceImpl.java)
at org.apache.derby.impl.jdbc.EmbedConnection.handleException(EmbedConnection.java)
at org.apache.derby.impl.jdbc.ConnectionChild.handleException(ConnectionChild.java)
at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(EmbedStatement.java)
at org.apache.derby.impl.jdbc.EmbedPreparedStatement.executeStatement(EmbedPreparedStatement.java)
at org.apache.derby.impl.jdbc.EmbedPreparedStatement.executeUpdate(EmbedPreparedStatement.java)
at org.apache.derby.iapi.jdbc.BrokeredPreparedStatement.executeUpdate(BrokeredPreparedStatement.java)
at org.tranql.connector.jdbc.PreparedStatementHandle.executeUpdate(PreparedStatementHandle.java:103)
at net.sf.hibernate.persister.EntityPersister.insert(EntityPersister.java:518)
... 34 more
</pre></small></small></p>


Name and version of the database you are using:
Derby

The generated SQL (show_sql=true):
17:56:12,377 DEBUG [SQL] insert into T_ORDER (city, country, state, street1, street2, zipcode, creditCardExpiryDate, creditCardNumber, creditCardType, customer_fk, orderDate, status, ORDERID) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, default)