I am trying to make the Json output from Cucumber into a single Java object. This contains objects nested four levels deep, and I am having trouble deserializing it. I am presently using Jackson, but open to suggestions. Here is my Json code:
{
"line": 1,
"elements": [
{
"line": 3,
"name": "Converteren centimeters naar voeten/inches",
"description": "",
"id": "applicatie-neemt-maten-in-cm-en-converteert-ze-naar-voet/inch,-en-vice-versa;converteren-centimeters-naar-voeten/inches",
"type": "scenario",
"keyword": "Scenario",
"steps": [
{
"result": {
"duration": 476796588,
"status": "passed"
},
"line": 4,
"name": "maak Maten-object aan met invoer in \"centimeters\"",
"match": {
"arguments": [
{
"val": "centimeters",
"offset": 37
}
],
"location": "StepDefinition.maakMatenObjectAanMetInvoerIn(String)"
},
"keyword": "Given "
},
{
"result": {
"duration": 36319,
"status": "passed"
},
"line": 5,
"name": "ik converteer",
"match": {
"location": "StepDefinition.converteerMaten()"
},
"keyword": "When "
},
{
"result": {
"duration": 49138,
"status": "passed"
},
"line": 6,
"name": "uitvoer bevat maat in \"voeten/inches\"",
"match": {
"arguments": [
{
"val": "voeten/inches",
"offset": 23
}
],
"location": "StepDefinition.uitvoerBevatMaatIn(String)"
},
"keyword": "Then "
}
]
},
{
"line": 8,
"name": "Converteren voeten/inches naar centimeters",
"description": "",
"id": "applicatie-neemt-maten-in-cm-en-converteert-ze-naar-voet/inch,-en-vice-versa;converteren-voeten/inches-naar-centimeters",
"type": "scenario",
"keyword": "Scenario",
"steps": [
{
"result": {
"duration": 84175,
"status": "passed"
},
"line": 9,
"name": "maak Maten-object aan met invoer in \"voeten/inches\"",
"match": {
"arguments": [
{
"val": "voeten/inches",
"offset": 37
}
],
"location": "StepDefinition.maakMatenObjectAanMetInvoerIn(String)"
},
"keyword": "Given "
},
{
"result": {
"duration": 23928,
"status": "passed"
},
"line": 10,
"name": "ik converteer",
"match": {
"location": "StepDefinition.converteerMaten()"
},
"keyword": "When "
},
{
"result": {
"duration": 55547,
"status": "passed"
},
"line": 11,
"name": "uitvoer bevat maat in \"centimeters\"",
"match": {
"arguments": [
{
"val": "centimeters",
"offset": 23
}
],
"location": "StepDefinition.uitvoerBevatMaatIn(String)"
},
"keyword": "Then "
}
]
}
],
"name": "Applicatie neemt maten in cm en converteert ze naar voet/inch, en vice versa",
"description": "",
"id": "applicatie-neemt-maten-in-cm-en-converteert-ze-naar-voet/inch,-en-vice-versa",
"keyword": "Feature",
"uri": "sample.feature"
}
I have tried a number of different approaches. First I used nested inner classes, but it appeared you had to make them static, which I feared would not work since I have multiple instances of the same object within one (multiple "element"-objects in the root, for example). Then I tried putting them in separate classes, with Json annotations. Here's where that got me (omitting setters):
public class CucumberUitvoer {
private String name;
private String description;
private String id;
private String keyword;
private String uri;
private int line;
@JsonProperty("elements")
private List<FeatureObject> elements;
public CucumberUitvoer(){}
}
public class FeatureObject {
private String name;
private String description;
private String id;
private String type;
private String keyword;
private int line;
@JsonProperty("steps")
private List<StepObject> steps;
public FeatureObject() {
}
}
public class StepObject {
@JsonProperty("result")
private ResultObject result;
private String name;
private String given;
private String location;
private String keyword;
private int line;
@JsonProperty("match")
private MatchObject match;
public StepObject(){}
}
public class ResultObject {
private int duration;
private String status;
public ResultObject(){}
}
public class MatchObject {
@JsonProperty("arguments")
private List<ArgumentObject> arguments;
private String location;
public MatchObject(){}
}
public class ArgumentObject {
private String val;
private String offset;
public ArgumentObject(){}
}
For clarification, here's a class diagram of how the nesting works.
This solution gives me the following error:
com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of nl.icaprojecten.TestIntegratieQuintor.JSONInterpreter.CucumberUitvoer out of START_ARRAY token
Here is the code doing the actual mapping:
ObjectMapper mapper = new ObjectMapper();
mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
CucumberUitvoer obj1 = null;
try {
obj1 = mapper.readValue(json, CucumberUitvoer.class);
} catch (IOException e) {
e.printStackTrace();
}
Is there a quick fix to this approach to make it work, or should I try something entirely different?
Ok I spent some time debugging and trying to figure out what was the problem, and finally was something pretty obvious.
implements Serializable
Thats the line I added to MatchObject and worked.
When we try to deserialize some object first we have to make those classes implements the interface Serializable