The API specifies com::sun::star::style::ParagraphAdjust ParaAdjust in ParagraphProperties Service Reference And com::sun::star::style::ParagraphAdjust as enum ParagraphAdjust Now take a text document or a shape with text and look at property ParaAdjust using the DevelopmentTools. There you see that "ParaAdjust" has type "short". That is a problem, as for example the C++ code sal_Int16 nParaAdjust(3); xParagraphPropSet->getPropertyValue("ParaAdjust") >>= nParaAdjust; works, but style::ParagraphAdjust eParaAdjust(style::ParagraphAdjust_CENTER); xParagraphPropSet->getPropertyValue("ParaAdjust") >>= eParaAdjust; does not work. Example of its use in core is https://opengrok.libreoffice.org/xref/core/filter/source/svg/svgexport.cxx?r=7dd9790b#2173 There you see the required type conversions. I don't know what is the best solution. But in case we keep it as "short" in core, there should be a comment in the API description of ParaAdjust property, that its actual value type is "short" and using the enum needs type conversions.
https://gerrit.libreoffice.org/c/core/+/140344
FTR: the innermost implementation is SvxAdjustItem::QueryValue, putting sal_Int16. The counterpart, SvxAdjustItem::PutValue, uses cppu::enum2int, so is prepared for both plain integers and enums in the passed Any.