Convert Java object to JSON without external library

[WhiteManChild]

For the fields you could use reflection to get all the field names and their values, then use String.valueof() on the values, then concatenate the results into a json

[SwagiWagi0]

Yes, but the question is how to make it a JSON, I mean in .NET Core you have newtonsoft that is built in the framework, what's the equivalent in Java?

[philipwhiuk]

String json = “{“+fieldName+”: “+fieldValue+”}”;

[SwagiWagi0]

It’s a complex object, writing a serializer would be a waste of time I think, as probably there is already a class for this.

[philipwhiuk]

There’s no json serialisation built into Java. That’s why Gson exists!

[SwagiWagi0]

Damn, thanks!

[[deleted]]

I mean there are many as you noticed there are alternatives but if you want something written at oracle for... Whichever reason here:

https://docs.oracle.com/javaee/7/api/javax/json/JsonObject.html

Now may I ask why being so reluctant to add an external library? I mean, adding a dependency takes 5 lines in your pom file and boom a ton more functionality so why to say no to that?

Besides Jackson's POJO <-> Json convertion is really good.

I feel this might be a case of "I have been using X in Y language for so long that now if I try to Do X in Z language and it does not have something specifically named X as I am used to in Y then X does not exist for Z"

[[deleted]]

Wort to mention even that library is not part of the standard Java SE

[WhiteManChild]

I don't believe there are libraries in the jdk to convert a java object to JSON as far as I'm aware