Using hibernate spatial with Oracle Database 11g Release 2, Hibernate 3.6, HibernateSpatial last trunk version, Spring 3.04
I have this problem that I cannot cope to solve :

On the hibernate trace I see that the connection to oracle is abruptly closed during the iteration on the result set.
This happens only with hql request that contains spatial criteria.
The first request of the day work well.
I use Junit to realize my tests.

I have this error,
0 ERROR org.hibernate.util.JDBCExceptionReporter:234 - No more data to read from socket

Or this one :
"234 - ORA-22060: argument [2] is an invalid or uninitialized number
ORA-06512: at "MDSYS.SDO_3GL", line 4
ORA-06512: at "MDSYS.SDO_3GL", line 28
ORA-06512: at "MDSYS.MD2", line 642
ORA-06512: at "MDSYS.SDO_GEOM", line 936
ORA-06512: at "MDSYS.SDO_GEOM", line 977
ORA-06512: at "MDSYS.ST_GEOMETRY", line 89
ORA-06512: at "MDSYS.OGC_WITHIN", line 6"

My hibernate settings (via spring) are :
---------------------------------------

<property name="hibernateProperties">
<value>
connection.provider_class=org.hibernatespatial.oracle.DefaultConnectionFinder
<!-- SPATIAL SQL oracle dialect -->
hibernate.dialect=org.hibernatespatial.oracle.OracleSpatial10gDialect
hibernate.current_session_context_class=thread
hibernate.transaction.factory_class= org.hibernate.transaction.JDBCTransactionFactory
hibernate.test.validateDataCleanup=false
<!-- hibernate.connection.release_mode=on_close-->
<!-- hibernate.jdbc.use_scrollable_resultset=true-->
</value>


org.hibernatespatial.oracle.OracleSpatial10gDialect.properties File :
---------------------------------------
OGC_STRICT=true
CONNECTION-FINDER=org.hibernatespatial.oracle.DefaultConnectionFinder


hibernate-spatial.cfg.xml
---------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<hibernate-spatial>
<default_dialect>org.hibernatespatial.oracle.OracleSpatial10gDialect</default_dialect>
<dialect>org.hibernatespatial.oracle.OracleSpatial10gDialect</dialect>
<precision_model>FIXED</precision_model>
<precision_model_scale>5</precision_model_scale>
</hibernate-spatial>

<bean id="dataSource" class="oracle.jdbc.pool.OracleDataSource" destroy-method="close">
<property name="connectionCachingEnabled" value="true" />
<property name="URL" value="jdbc:oracle:thin:@server:1521:SID"/>
<property name="user" value="USER"/>
<property name="password" value="PASS"/>
<property name="connectionCacheProperties">
<props merge="default">
<prop key="MinLimit">3</prop>
<prop key="MaxLimit">20</prop>
</props>
</property>
</bean>

I have tried different combinaison of configuration without success.

Any idea is welcomed.

Jean-Marc