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nHibenrate Exception: Unable to locate appropriate constructor on class [Persistence.vo.CaseTypeReportBean, Persistence]

I'm using aggregate functions in my HQL, it looks like this

and the CaseTypeReportBean is as bellowing

But as I run this function, system report this error message: Unable to locate appropriate constructor on class [Persistence.vo.CaseTypeReportBean, Persistence] [select new CaseTypeReportBean(t1.caseType, count(t1)) from Persistence.vo.Cases t1 group by t1.caseType]

It results from the inappropriate data type for CaseTypeReportBean constructor

Hence, I modify the constructor just like this(from int to Int64), then it works now

Reference: https://www.hibernate.org/407.html#A22