[xwiki-users] number property object?

hello XWiki experts, I have an object property that's of type number. I have not been able to find the type of a variable x so that: doc.getObject("Space.Class").set("amountr", x) doc.save() works without a hibernate error. I tried float or integer "sub-type" of number. What should I put? I tried with x=new Float(1.0f) but failed. thanks for hints. paul