Hello I am trying to parse the below array that contains array of objects.
public class JsonParser {
public JsonParser() {
String jsonString =
"[[{\"distance\":2272,\"duration\":580},{\"distance\":7217,\"duration\":1393},{\"distance\":5773,\"duration\":1061},{\"distance\":6208,\"duration\":1170},{\"distance\":18846,\"duration\":2686}],[{\"distance\":2262,\"duration\":558},{\"distance\":7144,\"duration\":1366},{\"distance\":4803,\"duration\":801},{\"distance\":5238,\"duration\":910},{\"distance\":17876,\"duration\":2426}],[{\"distance\":7207,\"duration\":1393},{\"distance\":7505,\"duration\":1411},{\"distance\":12375,\"duration\":2010},{\"distance\":12809,\"duration\":2119},{\"distance\":24868,\"duration\":3462}],[{\"distance\":7481,\"duration\":1255},{\"distance\":4643,\"duration\":831},{\"distance\":11497,\"duration\":2060},{\"distance\":434,\"duration\":109},{\"distance\":13197,\"duration\":1657}],[{\"distance\":7723,\"duration\":1326},{\"distance\":4884,\"duration\":902},{\"distance\":11739,\"duration\":2130},{\"distance\":434,\"duration\":107},{\"distance\":12999,\"duration\":1628}],[{\"distance\":20372,\"duration\":2918},{\"distance\":17534,\"duration\":2493},{\"distance\":25912,\"duration\":3432},{\"distance\":13669,\"duration\":1774},{\"distance\":13414,\"duration\":1779}]]"
;
ObjectMapper oMapper = new ObjectMapper();
oMapper.configure(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT,
true);
oMapper.configure(DeserializationFeature.ACCEPT_EMPTY_ARRAY_AS_NULL_OBJECT,
true);
matrix = oMapper.convertValue(jsonString, DistanceMatrix.class);
}
}
public class DistanceMatrix {
public ArrayList<ArrayList<Map<String, Float>>> matrix = new
ArrayList<ArrayList<Map<String, Float>>>();
}
The json string can contains null elements as well
String jsonString =
"[[null,{\"distance\":2272,\"duration\":580},{\"distance\":7217,\"duration\":1393},{\"distance\":5773,\"duration\":1061},{\"distance\":6208,\"duration\":1170},{\"distance\":18846,\"duration\":2686}],[{\"distance\":2262,\"duration\":558},null,{\"distance\":7144,\"duration\":1366},{\"distance\":4803,\"duration\":801},{\"distance\":5238,\"duration\":910},{\"distance\":17876,\"duration\":2426}],[{\"distance\":7207,\"duration\":1393},{\"distance\":7505,\"duration\":1411},null,{\"distance\":12375,\"duration\":2010},{\"distance\":12809,\"duration\":2119},{\"distance\":24868,\"duration\":3462}],[{\"distance\":7481,\"duration\":1255},{\"distance\":4643,\"duration\":831},{\"distance\":11497,\"duration\":2060},null,{\"distance\":434,\"duration\":109},{\"distance\":13197,\"duration\":1657}],[{\"distance\":7723,\"duration\":1326},{\"distance\":4884,\"duration\":902},{\"distance\":11739,\"duration\":2130},{\"distance\":434,\"duration\":107},null,{\"distance\":12999,\"duration\":1628}],[{\"distance\":20372,\"duration\":2918},{\"distance\":17534,\"duration\":2493},{\"distance\":25912,\"duration\":3432},{\"distance\":13669,\"duration\":1774},{\"distance\":13414,\"duration\":1779},null]]"
;
This throws the error
Exception in thread "main" java.lang.IllegalArgumentException: Cannot
> construct instance of `com.beeline.DistanceMatrix` (although at least one
> Creator exists): no String-argument constructor/factory method to
> deserialize from String value
> ('[[{"distance":2272,"duration":580},{"distance":7217,"duration":1393},{"distance":5773,"duration":1061},{"distance":6208,"duration":1170},{"distance":18846,"duration":2686}],[{"distance":2262,"duration":558},{"distance":7144,"duration":1366},{"distance":4803,"duration":801},{"distance":5238,"duration":910},{"distance":17876,"duration":2426}],[{"distance":7207,"duration":1393},{"distance":7505,"duration":1411},{"distance":12375,"duration":2010},{"distance":12809,"duration":2119},{"distance":24868,"duration":3462}],[{"distance":7481,"duration":1255},{"distance":4643,"duration":831},{"distance":11497,"duration":2060},{"distance":434,"duration":109},{"distance":13197,"duration":1657}],[{"distance":7723,"duration":1326},{"distance":4884,"duration":902},{"distance":11739,"duration":2130},{"distance":434,"duration":107},{"distance":12999,"duration":1628}],[{"distance":20372,"duration":2918},{"distance":17534,"duration":2493},{"distance":25912,"duration":3432},{"distance":13669,"duration":1774},{"distance":13414,"duration":1779}]]')
> at [Source: UNKNOWN; line: -1, column: -1]
> at
> com.fasterxml.jackson.databind.ObjectMapper._convert(ObjectMapper.java:3750)
> at
> com.fasterxml.jackson.databind.ObjectMapper.convertValue(ObjectMapper.java:3668)
> at com.beeline.JsonParser.<init>(JsonParser.java:17)
> at com.beeline.VehicleOptimiser.main(VehicleOptimiser.java:22)
Am I missing anything?
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