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Jackson : Can not deserialize instance of java.util.ArrayList out of VALUE_TRUE token


Jackson : Can not deserialize instance of java.util.ArrayList out of VALUE_TRUE token

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Jackson : Can not deserialize instance of java.util.ArrayList out of VALUE_TRUE token
Tag : android , By : Porta
Date : November 23 2020, 01:01 AM

I wish this help you Right, so now I can see that each one of those attributes are collections, not simple attributes. So for each one of those, Jackson it's trying to map to a List, for example. So, try with:
@JsonIgnoreProperties(ignoreUnknown=true)
public class LireTheme {

private List<Themes> themes;
private List<CouchesTheme> c_Theme;
private List<ClassesEvenement> c_Evenement;

private String message;
private boolean ok;

//getters and setters

}

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RestEasy : org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance of java.util.ArrayList out of STA


Tag : java , By : James Dio
Date : March 29 2020, 07:55 AM
help you fix your problem That looks like a Jackson error, where it's expecting to parse an array (which would begin with a '[') but it's encountering the beginning token for an object ('{'). From looking at your code, Im guessing it's trying deserialise JSON into your List but it's getting the JSON for an object.
What does the JSON your REST endpoint returns look like? It ought to look like this
[
    {
        // JSON for VariablePresentation value 0
        "field0": <some-value>
        <etc...>
    },
    <etc...>
]

org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance of java.util.ArrayList out of START_OBJECT t


Tag : hibernate , By : NeedOptic
Date : March 29 2020, 07:55 AM
I hope this helps you . I am not saying this is the way to fixed the issue. This is another way of solving the problem.
public class CustomerTest {
    final String path = "http://localhost:8080/RestEasy-Spring-MVC-Hibernate/";
    ICustomerService proxy = null;

    @Before
    public void beforeClass(){
        ResteasyClient client = new ResteasyClientBuilder().build();
        ResteasyWebTarget target = client.target(UriBuilder.fromPath(path));
        proxy = target.proxy(ICustomerService.class);
    }

    @Test
    public void testGetallcustomer() throws Exception {
        CustomerListType customers = proxy.getAllCustomerInfo();
        List<CustomerType> customerTypes = customers.getCustomerType();
        for (CustomerType customerType : customerTypes) {
            System.out.println("----------------------------------------------------");
            System.out.println("Name       : "+customerType.getName());
            System.out.println("Age        : "+customerType.getAge());
            System.out.println("CustomerId : "+customerType.getCustomerId());
        }
    }
}

Jackson Can not deserialize instance of java.util.ArrayList out of VALUE_STRING token


Tag : java , By : kraszie
Date : October 31 2020, 04:00 PM
this one helps. Sotirios is correct.
Problem is with webservice returning strings instead of json.

jackson kotlin - Cannot deserialize instance of `java.util.ArrayList` out of START_OBJECT token


Tag : java , By : Gianluca Riccardi
Date : March 29 2020, 07:55 AM
Hope that helps You need to have an outer object that matches the top level of the JSON. In this case change your code to:
data class ActivityConfig(
    @JsonProperty("activities-steps") val steps: List<ActivitiesSteps> = emptyList()
)

data class ActivitiesSteps(var dateTime: String, var value: String)

val stepsList = mapper.readValue<ActivityConfig>(jsonSteps).steps

com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `java.util.ArrayList` out of


Tag : java , By : Cesar Sanz
Date : March 29 2020, 07:55 AM
To fix this issue You need to enable ACCEPT_SINGLE_VALUE_AS_ARRAY feature. Probably in POJO you have a List but when there is only one element in a List JSON payload is generated without array brackets.
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.File;
import java.util.List;

public class JsonApp {

    public static void main(String[] args) throws Exception {
        File jsonFile = new File("./src/main/resources/test.json");

        ObjectMapper mapper = new ObjectMapper();
        mapper.enable(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY);

        Orgnization root = mapper.readValue(jsonFile, Orgnization.class);
        System.out.println(root);
    }
}
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