Read json file from POST in java

Question

How can I unmarhsaller json file like this?

{ "packageId": "11", "jsScript": "var divideFn = function(a,b) { return a/b} ", "functionName": "divideFn", "tests": [ { "testName": "test1", "expectedResult": "2.0", "params": [ 2, 1 ] } ] }

I have a class that works well with packageId, jsScrript, functionName, but not with the tests

public class Data { private final int packageId; private final String jsScript; private final String functionName; private final List<Tests> tests; @JsonCreator public Data(@JsonProperty("packageId") String packageId, @JsonProperty("jsScript") String jsScript, @JsonProperty("functionName") String functionName, @JsonProperty("tests") List<Tests> tests) { this.packageId = Integer.parseInt(packageId); this.jsScript= jsScript; this.functionName = functionName; this.tests = tests; } } public class Tests{ public final String testName; public final int expectedResult; @JsonCreator public Tests(@JsonProperty("testName") String testName, @JsonProperty("expectedResult") String expectedResult){ this.testName= testName; this.expectedResult = Integer.parseInt(expectedResult); } }

What should I change in classes to make it work well? I also tried to read tests like String, but it didn't help

@VikramV When I am trying to make a POST request I get Cannot unmarshal JSON as Data — Anton
– Anton, Commented Nov 1, 2019 at 15:23
Please post the error. If I had to guess, it would be because there's no @JsonProperty for params. — RBH
– RBH, Commented Nov 1, 2019 at 15:40
The code that triggers the unmarshalling would also be helpful. Please add it to the question. — SebastianK
– SebastianK, Commented Nov 1, 2019 at 16:28
I think your Test class is missing params attribute. Either add the field or add @JsonIgnoreProperties(ignoreUnknown = true) at Tests class level. — dassum
– dassum, Commented Nov 1, 2019 at 16:38

LHCHIN · Accepted Answer · 2019-11-04 07:50:34Z

It seems that you have encountered some problems for deserializing the JSON array tests to objects. There are several methods to solve this.

Method 1
Add @JsonIgnoreProperties(ignoreUnknown = true) on your class Tests to prevent your code from the exception of Unrecognized field "params".

Method 2
Deserialize JSON array tests to List<JsonNode> if it is not important and you won't further parse it in the future.

Method 3
Use follwing class for mapping JSON array tests to List<Test>.

class Test { private String testName; private Float expectedResult; private List<Integer> params; //general getters ans setters }

BTW, I don't think you need to use @JsonCreator for deserialization.

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