My question is very simple: how can I have a "left outer join" instead of that "inner join" using Criteria and createAlias, or something similar?
Is it possible somehow?

Regards
Alessandro

Hibernate version:
3.0.5
Mapping documents:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 1.1//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="testHib3.tstDACmain" table="tst_main">
<id column="id" name="id" type="long">
<generator class="native"></generator>
</id>
<property column="des" length="50" name="des" not-null="false" type="string"/>
<many-to-one name="externStd" column="id_extern_std" class="testHib3.tstDACExternStd"
cascade="none" outer-join="false" not-null="false"/>
</class>
<class name="testHib3.tstDACExternStd" table="tst_extern_std" lazy="true">
<id column="id" name="id" type="long">
<generator class="native"></generator>
</id>
<property column="des" length="50" name="des" not-null="false" type="string"/>
</class>
</hibernate-mapping>

Code between sessionFactory.openSession() and session.close():

Criteria crit = hibSession.createCriteria(tstDACmain.class)
.createAlias("this.externStd", "ex");
List res = crit.list();

Full stack trace of any exception that occurs:
No exception

Name and version of the database you are using:
Not meaningfull

The generated SQL (show_sql=true):
Hibernate: select this_.id as id1_, this_.des as des0_1_, this_.id_extern_std as id3_0_1_, ex1_.id as id0_, ex1_.des as des1_0_, ex1_.id as id1_0_ from tst_main this_ inner join tst_extern_std ex1_ on this_.id_extern_std=ex1_.id

what about having

outer-join="true"

in your mapping definition ?

I've tried with both outer-join="false" and outer-join="true", but the query is always done with INNER JOIN.

Outer join isn't supported in the Criteria API unfortunately, if you see some digging you will find some threads which discuss this.

Any plans to implement it?
It seems a big limit for the Criteria API, if I can use it just for reading a single table, without joins, it's almost useless.