If in json string, the property is missing, and the corresponding Java type
is Optional, the deserialized field value is null, where Optional.Empty is
expected.
There is the code to reproduce this issue.
// I know that using Optional type in class field is generally regarded as
an anti-pattern.
public static class FooRequest {
private Optional<Long> foo;
public Optional<Long> getFoo() {
return foo;
}
public void setFoo(Optional<Long> foo) {
this.foo = foo;
}
}
@Test
public void testDeserializeOptional_property_missing() throws Exception
{
ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new Jdk8Module());
FooRequest fooRequest = mapper.readValue("{}", FooRequest.class);
* // the issue : fooRequest.foo is null here, where Optional.Empty
is expected*
Assert.assertFalse(fooRequest.getFoo().isPresent());
}
@Test
public void testDeserializeOptional_property_isnull() throws Exception {
ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new Jdk8Module());
FooRequest fooRequest = mapper.readValue("{\"foo\":null}",
FooRequest.class);
Assert.assertFalse(fooRequest.getFoo().isPresent());
}
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