I’m trying to save an object in SharedPreferences but first converting the object to JSON as shown below. However, the object is being both incorrectly converted and saved. The JSON looks like this: This makes it impossible to save and retrieve the schedule. Why is the name of the schedule file address …
Tag: gson
How to deserialize json to nested custom map via gson?
I have the following json To deserialize it, I have the following data model class. I am not getting any deserialization error when I am using gson but the profiles variable is coming as null. This is how I am deserializing. var json = gson.fromJson(data,json.class) inside the match object there can be a dyna…
IllegalArgumentException: Unable to create @Body converter for class
Whenever I try to create a request with Retrofit it fails. The strange thing is that it worked before, I didn’t change anything about the code. Now months later it doesn’t work anymore. I’m getting the following error: IllegalArgumentException: Unable to create @Body converter for class apis…
Parse a json list into list of object Java
I have a response as follows I want to map this json to a POJO object and have created this class I am currently using this way to read this The size of events is 2 but each event is coming as null instead of a map. Can Someone please help me ? Answer To achieve your goal you have
Gson showing nested Object as null
Im trying to deserialize objects into JSON, one object contains a nested object. I created an instance of both the nested object (UserAddress)and the one containing it (UserObjectWithNestedObject). However, when I serialize, the nested object is null. So I ran the program in debugger mode to see when it goes …
Can’t register Gson TypeAdapter in Spring Boot
I have been trying to add custom serialization of my Version class in RestComponent: Json output I expect: not So I decide to use JsonSerializer and JsonDeserializer interfaces, also tried TypeAdapter. I’ve created a Gson Bean in my MVC configuration class, also tried to create GsonBuilder bean. In appl…
Why protected constructor can be used to new instance outside of the package?
From gson-2.8.6.jar Outside of the package com.google.gson.reflect, why the protected TypeToken() constructor can be used to new an instance? What’s the grammar that {} appear after new TypeToken<String>()? Answer What you are seeing is the syntax for an anonymous class: https://docs.oracle.com/ja…
Gson returns Json object with `=` instead of `:` [closed]
Closed. This question needs debugging details. It is not currently accepting answers. Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question. Closed 1 year ago. Improve this question Here i…
In Kotlin, how does GSON.fromJson(…) manage to mutate a read-only field of an existing object?
In Kotlin, how can an instance’s read-only val field be mutated? In the following Kotlin code, gson.fromJson(…) gets a Thing(0) from the InstanceCreator and somehow manages to mutate value from 0 to 1, then return that object. How? I verified that the object returned by gson.fromJson(…) is t…
Collect all elements in a JSON file into a single list
I am using Gson 2.8.1+ (I can upgrade if needed). If I have the JsonObject: … how can I convert this efficiently to the form: Answer Simple example: