java math BigInteger cannot be cast to java lang Integer

Question

I m getting the following exception    Caused by       java lang ClassCastException  java math BigInteger cannot be cast to   java lang Integer   with the following code  List queryResult   query list     for  Iterator lt Object   gt  it   queryResult iterator    it hasNext           Object   result   it next        Integer childId    Integer  result 0       Integer grandChildCount    Integer  result 1       CompanyNode childNode   childNodes get childId       childNode setHasChildren grandChildCount    0       childNode setIsLeaf grandChildCount    0       at this line   Integer grandChildCount    Integer  result 1     Does anybody have any idea

User · Answer

You can try this     BigDecimal  volume  intValue      I use java math BigDecimal convert to int  primitive type    It is worked for me

User · Answer

As we see from the javaDoc  BigInteger is not a subclass of Integer   java lang Object                      java lang Object    java lang Number                       java lang Number       java math BigInteger                    java lang Integer   And that s the reason why casting from BigInteger to Integer is impossible   Casting of java primitives will do some conversion  like casting from double to int  while casting of types will never transform classes

User · Answer

The column in the database is probably a DECIMAL  You should process it as a BigInteger  not an Integer  otherwise you are losing digits  Or else change the column to int

User · Answer

You can use   Integer grandChildCount     BigInteger  result 1   intValue      Or perhaps cast to Number to cover both Integer and BigInteger values

User · Answer

java lang Integer is not a super class of BigInteger   Both BigInteger and Integer do inherit from java lang Number  so you could cast to a java lang Number   See the java docs http   docs oracle com javase 1 5 0 docs api java lang Number html

[java] java.math.BigInteger cannot be cast to java.lang.Integer

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