Firebird database report asks for java

[Flotonero]

Hello.
I am using portable libreoffice 6.3.4.2 (x86) on a windows 7 machine.
I have a database migrated from embebded HSQLDB to embebded Firebird.
I supposed that firebird does not require java, but when I launch a report, a window appears asking for a java environment. Tables and forms work ok. And so do reports when I select in advanced options “Use java environment”, although I don’t select any of the available java environments.

Is java still needed in base using firebird?

[mikekaganski]

FAQ:

HSQLDB engine requires Java; Firebird engine does not.

But report machinery in LibreOffice (independent of DB engine) requires Java by itself.

[Flotonero]

That sets it. Thanks.