How to change javax.json.JsonObject object?

Question

I encode a function in which I read and write json. However, I can read json elements from a file, but I cannot edit the same loaded object. Here is my code I'm working on.

InputStream inp = new FileInputStream(jsonFilePath); JsonReader reader = Json.createReader(inp); JsonArray employeesArr = reader.readArray(); for (int i = 0; i < 2; i++) { JsonObject jObj = employeesArr.getJsonObject(i); JsonObject teammanager = jObj.getJsonObject("manager"); Employee manager = new Employee(); manager.name = teammanager.getString("name"); manager.emailAddress = teammanager.getString("email"); System.out.println("uploading File " + listOfFiles[i].getName()); File file = insertFile(...); JsonObject tmpJsonValue = Json.createObjectBuilder().add("fileId", file.getId()).add("alternativeLink",file.getAlternateLink()).build(); jObj.put("alternativeLink", tmpJsonValue.get("alternativeLink")); <-- fails here } 

At startup, I get the following exception.

 Exception in thread "main" java.lang.UnsupportedOperationException at java.util.AbstractMap.put(AbstractMap.java:203) at com.mongodb.okr.DriveQuickstart.uploadAllFiles(DriveQuickstart.java:196) at com.mongodb.okr.App.main(App.java:28) 

Answer 1

javadoc JsonObject claims

JsonObject class represents the value of an immutable JSON object (an unordered set of zero or more name / value pairs). It also provides an unmodifiable map mapping for matching the names / values ​​of a JSON object.

You cannot modify these objects.

You will need to create a copy. There seems to be no direct way to do this. It looks like you will need to use Json.createObjectBuilder() and build it yourself (see the example in the related javadoc).