Using Jackson 2.9.6, i came across the following, which to me looks like a
bug. Abstract superclass A has two subclasses, B and C, where B again has a
subclass D
Adding the *@JsonTypeInfo* and *@JsonSubTypes* annotations as shown below,
I would expect that B,C and D should all be serialized with a *type=name
discriminator* field, but it appears that B, which "sits in the middle" of
the object hierarchy is instead serialized using the simple class name as
the type value.
JsonTypeInfo(use = NAME, include = PROPERTY, property = "type")
@JsonSubTypes({
@Type(value = B.class, name = "nameB"),
@Type(value = C.class, name = "nameC"),
})
abstract class A {
private final int i;
public int getI() {
return i;
}
public A(int i) {
this.i = i;
}
}
@JsonTypeInfo(use = NAME, include = PROPERTY, property = "type")
@JsonSubTypes({
@Type(value = D.class, name = "nameD"),
})
class B extends A {
public B(int i) {
super(i);
}
}
class C extends A {
public C(int i) {
super(i);
}
}
class D extends B {
public D(int i) {
super(i);
}
}
Reproduce with the following test:
Test
public void testA() throws Exception {
ObjectMapper mapper = new ObjectMapper();
System.out.println(mapper.writerWithDefaultPrettyPrinter().writeValueAsString(new
B(42)));
System.out.println(mapper.writerWithDefaultPrettyPrinter().writeValueAsString(new
C(42)));
System.out.println(mapper.writerWithDefaultPrettyPrinter().writeValueAsString(new
D(42)));
}
which yields :
{
"type" : "B",
"i" : 42
}
{
"type" : "nameC",
"i" : 42
}
{
"type" : "nameD",
"i" : 42
}
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