Use fastJson to parse the error create instance
Carefully check that the fields in the bean class are the same as those returned by the server, and the format is correct, so why does an error be reported?
Find the answer online if there is an embedded situation:
Error code:
public class A{
private String haha;
private int gogo;
private B bb;
public class B {
private String name;
private int price;
}
}
B is nested in A, then we need to declare the embedded class static attribute, as follows (this problem is solved)
Correct code:
public class A{
private String haha;
private int gogo;
private B bb;
public static class B{
private String name;
private int price;
}
}
Principle analysis
This problem is mainly caused by the implementation mechanism of Java internal classes and nested classes.
Static inner classes are called nested classes, so what is the difference between the two?
Although general internal classes are not written in the source code, after compilation, you will see that there is an additional reference to the external class. If you use the internal class for json serialization, an exception will be reported because its external class cannot be found. The nested classes are static and do not have default external class references, and they can be used even if there is no object of the external class. Therefore, there will be no errors when converting json.