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

This error occurs when you try to cast a BigDecimal object to an Integer object. Since BigDecimal is a different data type than Integer, the casting fails and you get a ClassCastException.

To fix this error, you need to convert the BigDecimal object to an Integer object using the intValue() method. Here is an example:

BigDecimal bigDecimalObj = new BigDecimal("10.5");
Integer integerObj = bigDecimalObj.intValue();

In this example, we create a BigDecimal object with a value of 10.5. Then, we use the intValue() method to convert it to an Integer object. Now, the integerObj variable holds the value of 10.

Make sure to check that the BigDecimal value can be represented as an Integer before using the intValue() method, as it may result in data loss if the value is too large or has a decimal component.