java.lang.ArithmeticException：在displaytag中除以零

Question

I am using display tag in portals(Struts Portal Framework) deployed in websphere portal, using external paging using value list paging (implement PaginatedList) a strong exception has shown up java.lang.ArithmeticException: divide by zero in the following lines:

     int pageCount = behavioursPaginatedList.getFullListSize() /  Math.max(1,behavioursPaginatedList.getObjectsPerPage());
        if ((behavioursPaginatedList.getFullListSize() % behavioursPaginatedList.getObjectsPerPage()) > 0)
    {
        pageCount++;
    }

FullListSize = 13
ObjectPerPage = 4

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Answer 1

There are two places where divide by zero could occur:

int pageCount = behavioursPaginatedList.getFullListSize() / 
    Math.max(1,behavioursPaginatedList.getObjectsPerPage());

In this case, Math.max(1, ...) is guaranteed to deliver a value that is non-zero. So the exception cam't be coming from here

if ((behavioursPaginatedList.getFullListSize() % 
        behavioursPaginatedList.getObjectsPerPage()) > 0)

In this case, if behavioursPaginatedList.getObjectsPerPage() returns zero, then you will get a division by zero error.

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The fact that you are getting the exception says that division by zero is occurring, and that behavioursPaginatedList.getObjectsPerPage() is returning zero. You need to find out why that is happening.