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Remove @JsonTypeName from Java POJOs #14842

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Some other changes that I'm working on affect the behaviour of @JsonTypeName annotations in the Java pojo models. After doing some investigation, I concluded that those annotations are unnecessary (confirmed by this stackoverflow answer). @JsonTypeName is unnecessary when logical type names are specified within @JsonSubTypes, as is the case in the code generated from this project. As you can see from the generated samples, @JsonTypeName is also being added to classes that aren't a subclass of another model class, and @JsonTypeName is pointless in these cases as far as I know.

I created this PR as a separate change to limit the scope of changes. It's already large because of the number of samples affected. Removing the import of JsonTypeName is coming in separate PRs, as is removing the annotation from the Spring template.

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@bernie-schelberg-mywave
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I created another PR, #14852 which combines this change with the removal of @JsonTypeName from the JavaSpring template. This one can be closed if the other is accepted. For now I'll leave this one open for the purpose of reviewing the changes in isolation.

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This looks good to me, but affects more than spring.

I think @borsch and @wing328 should probably also take a quick look!

Thank you for investigating and adding the tests to validate behaviour 🎉

private final ObjectMapper objectMapper = new ObjectMapper();

@Test
public void shouldSerializeAndDeserializeModel() throws JsonProcessingException {
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Nice test!

*/
@Test
public void testSpecialCatAllOf() {
// TODO: test SpecialCatAllOf
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Adding before merging?

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I didn't plan to. It was created by the generator. It looks like most of the generated tests don't have any implementations in them. Is there anything that you think I should do with it?

import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.MatcherAssert.assertThat;

public class SpecialCatJacksonTest {
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This test is in the apache-httpclient - probably fine, but the tests here are not apache client specific

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Right, I'm still learning my way around the samples... I moved it into the java/native sample project. Is that the best place for it?

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I think java/native makes sense since it impacts all of Java

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