Dfr Dfr - 1 year ago 103
JSON Question

Java "Jackson" JsonMappingException: Can not deserialize instance of float out of FIELD_NAME token

with this class:

public class Products implements Serializable {
private BigDecimal productId;
private float priority;

public float getPriority() {
return priority;

public void setPriority(float priority) {
this.priority = priority;

When doing deserialization of such JSON data:


Got this error:

Can not deserialize instance of float out of FIELD_NAME token
at [Source: org.apache.catalina.connector.CoyoteInputStream@103cf49; line: 1, \
column: 290] (through reference chain: entity.Products["priority"])

But for this data (quotes around priority value)


works well, so it seems that jackson (1.9.9) does not respect numeric values ? I suspect something is wrong here.

Answer Source

You are declaring the field priority as a float type and you try to deserialize the Json which contains int value. Jackson try to call a setter function which accepts a integer value. So we need to add one setter like this.

public void setPriority(int priority){
    this.priority = Float.valueOf(priority);
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