ClassCastException and incompatible

Question

In a method I remember there was an error thrown at a line having the following code.

java.lang.ClassCastException: java.math.BigDecimal cannot be cast to java.lang.Integer

at

Integer count = (Integer) result[1];

and I replaced the code to

Integer count = ((BigDecimal) result[1]).intValue();

the error has gone.

But some how I got the following error for the same code snippets in the new project.

java.lang.ClassCastException: java.math.BigDecimal incompatible with java.lang.Integer

Just wanted to know, both of these are the same or not.

It's very hard to help you without knowing what `result` is... — Jon Skeet, Feb 13 '14 at 11:44
If you got the same error for the same code snippet, more often than not, it is the same problem and the same solution would be applicable. — Rahul, Feb 13 '14 at 11:44
For the incompatible error: _This exception is recevied when using Interchange Server Relationship APIs in WPS with Oracle as the database._ in http://www-01.ibm.com/support/docview.wss?uid=swg1JR31122 made me asking this question. — Nidheesh, Feb 13 '14 at 11:50
Were you found `java.math.Integer`? In java there is no such... — Ashot Karakhanyan, Feb 13 '14 at 11:56
Obviously, if the outcome of two program snippest is different under otherwise equal conditions, the snippets are not "the same". — Ingo, Feb 13 '14 at 12:03

score 0 · Answer 1 · answered Feb 13 '14 at 11:54

Both are not same Integer count = (Integer) result[1]; tries to cast the BigDecimal Object to the Integer. Will thorw an exception always.

Integer count = ((BigDecimal) result[1]).intValue(); this will work if your result has BigDecimal Object.

Better you check you have compiled your code properly.

score 0 · Answer 2 · answered Feb 13 '14 at 11:55

0

Try this:

Integer count = ((BigDecimal) result[1]).intValueExact();

Or: http://www.tutorialspoint.com/java/math/bigdecimal_intvalueexact.htm

answered Feb 13 '14 at 11:55

Simego

431
5
16

score 0 · Answer 3 · edited May 23 '17 at 10:33

BigDecimal.intValueExact() (or BigDecimal.intValue()) :

Converts this BigDecimal to an int. This conversion is analogous to a narrowing primitive conversion from double to short as defined in the Java Language Specification: any fractional part of this BigDecimal will be discarded, and if the resulting "BigInteger" is too big to fit in an int, only the low-order 32 bits are returned. Note that this conversion can lose information about the overall magnitude and precision of this BigDecimal value as well as return a result with the opposite sign.

Plase take into consideration that BigDecimal may contain values which are larger than Integer.MAX_VALUE.

Reference: here

ClassCastException and incompatible

3 Answers3