Execute_query problem on a 10g AS for forms

Good evening
A problem arises on a execute_query forms for AS 10g.
On Windows, a data block is refreshed by a execute_query in a when-new-block-instance.
Under Linux, the action fails.
Would you know what type of problem?
Thank you and good weekend.

By adding a message in the when-new-block-instance, the message is displayed by my OC4J under Windows.
After copying and compiling on the linux server, no message.
So, logically, when-new-block-instance is not enabled under linux.
I search with google...

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