Company company = new Company();
    dao.saveObject(company);  // this gives me a valid id generated by hibernate

   ...

    User user = new User();
    user.setCompany(company);
    dao.saveObject(user);   // my error is here

ERROR: insert or update on table "user" violates foreign key constraint "fk9501a78d45fc499f"
Detail: Key (company)=(111) is not present in table "company"

<?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">

<hibernate-mapping
>
    <class
        name="com.iloopmobile.davinci.model.User"
        table="User"
    >

        <id
            name="id"
            column="id"
            type="java.lang.Integer"
        >
            <generator class="identity">
              <!-- 
                  To add non XDoclet generator parameters, create a file named
                  hibernate-generator-params-User.xml
                  containing the additional parameters and place it in your merge dir.
              -->
            </generator>
        </id>

        <many-to-one
            name="company"
            class="com.iloopmobile.davinci.model.Company"
            cascade="save-update"
            outer-join="auto"
            update="true"
            insert="true"
            column="company"
        />

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

    </class>

</hibernate-mapping>