I am getting this error on MySQL 5.1.30. It seems something is wrong with the way hibernate is trying to input values. When i reverse engineer the tables using MySQL Workbench, i see that the BEACL table has objectid as foreign key with Not Null set. Two other tables having similar relationship(one-to-many) between them turn out to work properly. Any help is appreciated.

The Exception:

ERROR [http-8443-Processor24] (JDBCExceptionReporter.java:72) - Field 'objectid' doesn't have a default value
ERROR [http-8443-Processor24] (StandardWrapperValve.java:253) - Servlet.service() for servlet action threw exception
java.sql.SQLException: Field 'objectid' doesn't have a default value
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:946)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2870)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1573)
at com.mysql.jdbc.ServerPreparedStatement.serverExecute(ServerPreparedStatement.java:1169)
at com.mysql.jdbc.ServerPreparedStatement.executeInternal(ServerPreparedStatement.java:693)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1404)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1318)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1303)
at org.hibernate.persister.entity.BasicEntityPersister.insert(BasicEntityPersister.java:1759)
at org.hibernate.persister.entity.BasicEntityPersister.insert(BasicEntityPersister.java:2178)
at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:34)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:239)
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:240)
at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:160)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:95)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:184)
at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:173)
at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:69)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:481)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:476)
at com.belfast.storage.dao.ObjectDataDAO.saveACL(ObjectDataDAO.java:77)
at com.belfast.user.data.CreateObjectAction.execute(CreateObjectAction.java:86)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:425)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:228)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:525)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:874)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Thread.java:613)

The Code:
public boolean saveACL(ObjectData od, AclImpl acl) {

Session session = com.belfast.hibernate.HibernatePlugin.getSessionFactory().openSession();
Transaction tx = session.beginTransaction();
Criteria criteria = session.createCriteria(ObjectData.class).add(Expression.eq("objectId",od.getObjectId()));

List result = criteria.list();
boolean ret = false;
if(!result.isEmpty()) {
ObjectData odr = (ObjectData) result.get(0);
log.debug(odr.getName() +" & "+odr.getPath() +" & " +odr.getObjectId());
acl.setObject(odr);
odr.setAcl(acl);
session.save(acl);
tx.commit();
ret = true;
} else {
log.debug("No Object found");
}


try {
session.close();
} catch(Exception e) {
e.printStackTrace();
}

return ret;
}

public class AclImpl extends OwnerImpl implements Acl {
//
// Maintain four tables. one each for positive and negative
// ACLs. One each depending on whether the entity is a group
// or principal.
//

private long aclid;

private Map<Principal, AclEntry> allowedUsersTable =
new HashMap<Principal, AclEntry>(23);
private Map<Principal, AclEntry> allowedGroupsTable =
new HashMap<Principal, AclEntry>(23);
private Map<Principal, AclEntry> deniedUsersTable =
new HashMap<Principal, AclEntry>(23);
private Map<Principal, AclEntry> deniedGroupsTable =
new HashMap<Principal, AclEntry>(23);
private String aclName = null;
private List<Permission> zeroSet = new ArrayList<Permission>(1);
private ObjectData object;

...
public ObjectData getObject() {
return object;
}

public void setObject(ObjectData object) {
this.object = object;
}
}

<?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 package="mod.sun.security.acl">
<class name="AclImpl" table="BEACL">
<id name="aclid" column="aclid">
<generator class="native"></generator>
</id>
...
<one-to-one name="object" class="com.belfast.storage.object.ObjectData" constrained="false"/>
</class>
</hibernate-mapping>

<class name="com.belfast.storage.object.ObjectData" table="BEOBJDATA">
<id name="objectId" column="objectId">
<generator class="native"/>
</id>
...
<one-to-one name="acl" class="mod.sun.security.acl.AclImpl" cascade="delete"></one-to-one>
</class>

public class ObjectData implements Cloneable {

private long objectId;
private AclImpl acl;
}