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I am finding a very piculiar problem while fetching the data by primary key class wots happening is i have one table that has multiple primary keys so i am having its PrimaryId java class and in that i have both the keys as setter n getter and also its refered in the hbm.xml file too but now when i wanna load a particular object based on primary key i instantiate the primaryid object as new PRIMARYID(First, second) and pass this object to the session.get(PRIMARYID, id) and get the error that could not find mapping for PRIMARYID MappingException:

<b>org.hibernate.MappingException: Unknown entity: com.ess.sing.mvi.md.hibernate.system.gui.GuiFormTabsId.class</b>

can anyone suggest something.