Symptoms of this issue:

• VersionView feature of eZPublish does not work

• Debug Output shows something akin to the following:

oci_execute() [<a href='function.oci-execute'>function.oci-execute</a>]: ORA-01400: cannot insert NULL into ("EZDATABASENAME"."EZDBFILE"."NAME")
ORA-06512: at "EZDATABASENAME.EZEXCLUSIVELOCK", line 4
ORA-01403: no data found
ORA-06512: at line 1 in extension/ezoracle/clusterfilehandlers/dbbackends/oracle.php on line 1137

To Resolve the issue:

See kernel/content/versionview.php

302 
303 $Result = eZNodeviewfunctions::generateNodeView( $tpl, $node, $contentObject, $LanguageCode, 'full', 0,
304                                                  false, false, false );

I augmented the 8th parameter ( $cachePath ) of the call to eZNodeviewfunctions::generateNodeView( ) to push through the value 'var/cache'. You may need to pull this dynamically from another function for it to work in all environments, or catch it later on to resolve in the public trunk.

302 
303 $Result = eZNodeviewfunctions::generateNodeView( $tpl, $node, $contentObject, $LanguageCode, 'full', 0,
304                                                  false, 'var/cache', false );

Without the path, in clustered envionments you get a null $Result ( it relates to the cache file not being generated due to the missing path when passing via the eZOracle extension ).

Steps to reproduce

• Setup eZPublish with an Oracle cluster, configuring file.ini to push all files into the database
• Try and use the content/versionview kernel module