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PODeserializing JSON with nested arrays with Jackson
 

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  1. PODeserializing JSON with nested arrays with Jackson
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    <p>I am trying to deserialize JSON data into a custom class. I am having trouble getting the nested array to deserialize properly, throwing an exception. I have looked into various Jackson annotations but I haven't seen anything that might help.</p> <p>JSON:</p> <pre><code>{ "purchaseOrderLines": [ { "jsId": 1, "part": 26, "partNumber": "MS-12345", "quantityOrdered": "1000", "price": ".50", "unit": "EACH", "dueDate": "2013-12-31", "requirements": [ [ { "requirement": "degrease", "price": "25", "jsId": 0 } ] ], "class": "purchaseOrder.PurchaseOrderLine" } ], "vendor": "39", "shipper": "53", "shipMethod": "3", "vendorSalesman": "41" } </code></pre> <p>PurchaseOrder.java</p> <pre><code>package purchaseOrder; import java.util.ArrayList; import java.util.List; import models.addressBook.*; import play.db.jpa.Model; public class PurchaseOrder extends Model{ public Vendor vendor; public Contact vendorSalesman; public Shipper shipper; public ShipMethod shipMethod; public String notes; public List&lt;PurchaseOrderLine&gt; purchaseOrderLines= new ArrayList&lt;PurchaseOrderLine&gt;(); public List&lt;Requirement&gt; globalRequirements= new ArrayList&lt;Requirement&gt;(); } </code></pre> <p>PurchaseOrderLine.java</p> <pre><code>package purchaseOrder; import com.fasterxml.jackson.annotation.JsonIgnoreProperties; import java.math.BigDecimal; import java.util.ArrayList; import java.util.List; import models.inventory.Part; import org.joda.time.DateTime; import org.joda.time.format.ISODateTimeFormat; import purchaseOrder.util.UnitType; @JsonIgnoreProperties(ignoreUnknown = true) public class PurchaseOrderLine { public Part part; public Long quantityOrdered; public BigDecimal price; public UnitType unit; public DateTime dueDate; public List&lt;Requirement&gt; requirements= new ArrayList&lt;Requirement&gt;(); public void setDueDate(String dueDate) { this.dueDate = ISODateTimeFormat.date().parseDateTime(dueDate); } } </code></pre> <p>Requirement.java</p> <pre><code>package purchaseOrder; import com.fasterxml.jackson.annotation.*; import play.db.jpa.Model; @JsonIgnoreProperties(ignoreUnknown = true) public class Requirement extends Model { public String requirement; public String price; } </code></pre> <p>Exception:</p> <pre><code>com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of purchaseOrder.Requirement out of START_ARRAY token at [Source: java.io.StringReader@7fc99326; line: 1, column: 160] (through reference chain: PurchaseOrder["purchaseOrderLines"]-&gt;PurchaseOrderLine["requirements"]) at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:163) at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:588) at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:582) at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromArray(BeanDeserializer.java:512) at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:129) at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:226) at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:203) at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:23) at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:336) at com.fasterxml.jackson.databind.deser.impl.FieldProperty.deserializeAndSet(FieldProperty.java:87) at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:290) at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:112) at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:226) at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:203) at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:23) at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:336) at com.fasterxml.jackson.databind.deser.impl.FieldProperty.deserializeAndSet(FieldProperty.java:87) at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:290) at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:112) at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2580) at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:1810) at controllers.PurchaseOrderController.submitQuote(PurchaseOrderController.java:24) at play.mvc.ActionInvoker.invokeWithContinuation(ActionInvoker.java:557) at play.mvc.ActionInvoker.invoke(ActionInvoker.java:508) at play.mvc.ActionInvoker.invokeControllerMethod(ActionInvoker.java:484) at play.mvc.ActionInvoker.invokeControllerMethod(ActionInvoker.java:479) at play.mvc.ActionInvoker.invoke(ActionInvoker.java:161) ... 1 more </code></pre> <p>I know that deserializing the requirement class is good as I can deserialize the globalRequirements without problem. I can also deserialize fine if I omit the requirements of the purchaseOrderLine. Thanks for any help/pointers you can give</p>
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    1. USnelsonslament
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    1. CO'"requirements":[[ ... ]]' property contains array of arrays, so you probably have to change your Java mapping to 'List<List<Requirement>> requirements'. I am not sure that is the problem, but could you check it?
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      1. PODeserializing JSON with nested arrays with Jackson
      1. USMichał Ziober
    2. COI didn't even think to look at the json data being supplied,but it shouldn't have been an array of arrays. Thank you for helping me notice something I overlooked
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