"Failed to find generated POATie class" when narrowing to DataManager

Dear all, I'm developing some custom stuff starting from Adobe samples but got really stuck with a number of problems.
Passed the one mentioned in c4837.pdf, when I try to
DataManager dataManager = DataManagerHelper.narrow(
(org.omg.CORBA.Object)connectionFactory.getConnection()
now I get the following exception (both in my code and using the unmodified samples from Adobe):
java.lang.IllegalStateException: Failed to find generated POATie class. Make sure that right idlj options are used. at com.adobe.CORBA.ServantBasePeerImpl.getTie(ServantBasePeerImpl.java:181) at com.adobe.CORBA.ServantBasePeerImpl.activate(ServantBasePeerImpl.java:99) at com.adobe.CORBA.ServantBase.activateWithOwner(ServantBase.java:57) at com.adobe.service.ResourcePeer.connect(ResourcePeer.java:87) at com.adobe.service.Resource.connect(Resource.java:80) at com.adobe.service.DataManagerImpl.(DataManagerImpl.java:65) at com.adobe.service.DataManagerManagedConnection.allocateConnection(DataManagerManagedConne ction.java:34) at com.adobe.service.ConnectionResource.getConnection(ConnectionResource.java:39) at com.adobe.service.J2EEConnectionFactoryManagerPeerImpl.getConnection(J2EEConnectionFactor yManagerPeerImpl.java:108) at com.adobe.livecycle.samples.forms.Ubi_cfor_01.renderX.uc_enable_pdf(renderX.java:205) at com.adobe.livecycle.samples.forms.Ubi_cfor_01.renderX.doGet(renderX.java:368)
NY
BADLY NEEDED HELP???

I add some log lines that appear just a bit before the ones already posted, maybe they indicate the root cause for this:
09:37:38,193 INFO [STDOUT] Problem with system rootjavax.naming.NameNotFoundException: com.adobe.idp.config.PreferencesSPIHome not bound
09:37:38,194 INFO [STDOUT] javax.naming.NameNotFoundException: com.adobe.idp.config.PreferencesSPIHome not bound
09:37:38,195 INFO [STDOUT] at org.jnp.server.NamingServer.getBinding(NamingServer.java:495)
09:37:38,195 INFO [STDOUT] at org.jnp.server.NamingServer.getBinding(NamingServer.java:503)
09:37:38,196 INFO [STDOUT] at org.jnp.server.NamingServer.getObject(NamingServer.java:509)
09:37:38,196 INFO [STDOUT] at org.jnp.server.NamingServer.lookup(NamingServer.java:282)
09:37:38,196 INFO [STDOUT] at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:530)
09:37:38,197 INFO [STDOUT] at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:509)
09:37:38,197 INFO [STDOUT] at javax.naming.InitialContext.lookup(InitialContext.java:351)
09:37:38,197 INFO [STDOUT] at com.adobe.idp.config.EJBUtil.getPreferencesSPIHome(EJBUtil.java:140)
09:37:38,198 INFO [STDOUT] at com.adobe.idp.config.AdobePreferenceFactory.systemRoot(AdobePreferenceFactory.java:120)
09:37:38,198 INFO [STDOUT] at com.adobe.formServer.mbean.FormServerConfigImpl.dbInitPreferences(FormServerConfigImpl.ja va:555)
09:37:38,198 INFO [STDOUT] at com.adobe.formServer.mbean.FormServerConfigImpl.dbGetProperties(FormServerConfigImpl.java :571)
09:37:38,199 INFO [STDOUT] at com.adobe.formServer.mbean.FormServerConfigImpl.getOptionsString(FormServerConfigImpl.jav a:476)
09:37:38,199 INFO [STDOUT] at com.adobe.formServer.mbean.FormServerConfigPOATie.getOptionsString(FormServerConfigPOATie .java:199)
09:37:38,200 INFO [STDOUT] at com.adobe.formServer.mbean.FormServerConfigPOA._invoke(FormServerConfigPOA.java:344)
09:37:38,200 INFO [STDOUT] at org.jacorb.poa.RequestProcessor.invokeOperation(Unknown Source)
09:37:38,200 INFO [STDOUT] at org.jacorb.poa.RequestProcessor.process(Unknown Source)
09:37:38,201 INFO [STDOUT] at org.jacorb.poa.RequestProcessor.run(Unknown Source)

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