Bean属性设置为0

Question

My bean is correctly using a setter and sets the property to the desired value, but then it enters into a method which uses the property and it is automatically being set to 0. I don't even know where the 0 is coming from. In debug it jumps right from the setter to the method so I cannot see anything happening in-between.

The bean uses the @SessionScoped annotation if that has anything to do with it.

Answer 1

private int vendorno

Java primitives like int , boolean , long , etc have a fixed default value.

Use wrapper objects instead like Integer , Boolean , Long . They can be null .

private Integer vendorno;

See also:

• Learning the Java Language > Language Basics > Primitive Data Types