How to fix “com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field” Error Message – Rest API

[Poovaraj]

Hi ,

I got below error message while executing Rest API command. Can you please help me how to fix this error ?

Code:

RestAssured.baseURI = “http://restapi.demoqa.com/utilities/books/getallbooks”;
RequestSpecification httpRequest = RestAssured.given();
Response response = httpRequest.get(“”);

// First get the JsonPath object instance from the Response interface 
JsonPath jsonPathEvaluator = response.jsonPath();

// Read all the books as a List of String. Each item in the list
// represent a book node in the REST service Response
List<Book> allBooks = jsonPathEvaluator.getList(“books”, Book.class);

// Iterate over the list and print individual book item
// Note that every book entry in the list will be complete Json object of book
for(Book book : allBooks)
{
System.out.println(“Book: ” + book.title);
}

 

Error Message:

com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field “website” (class LearningRestAssured.RestAssured.Book), not marked as ignorable (0 known properties: ])
at [Source: (String)”{“website”:”http://eloquentjavascript.net/”,”pages”:472,”author”:”Marijn Haverbeke”,”isbn”:”9781593275846″,”subtitle”:”A Modern Introduction to Programming”,”publisher”:”No Starch Press”,”description”:”JavaScript lies at the heart of almost every modern web application, from social apps to the newest browser-based games. Though simple for beginners to pick up and play with, JavaScript is a flexible, complex language that you can use to build full-scale applications.”,”published”:”2014-12-14T00:0″[truncated 57 chars]; line: 1, column: 13] (through reference chain: LearningRestAssured.RestAssured.Book[“website”])
at com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException.from(UnrecognizedPropertyException.java:60)
at com.fasterxml.jackson.databind.DeserializationContext.handleUnknownProperty(DeserializationContext.java:822)
at com.fasterxml.jackson.databind.deser.std.StdDeserializer.handleUnknownProperty(StdDeserializer.java:1152)
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownProperty(BeanDeserializerBase.java:1567)
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownVanilla(BeanDeserializerBase.java:1545)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:293)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:151)
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4001)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3030)
at com.fasterxml.jackson.databind.ObjectMapper$readValue$0.call(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:133)
at io.restassured.internal.path.json.mapping.JsonPathJackson2ObjectDeserializer.deserialize(JsonPathJackson2ObjectDeserializer.groovy:45)
at io.restassured.path.json.mapping.JsonPathObjectDeserializer$deserialize.call(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125)
at io.restassured.internal.path.json.mapping.JsonObjectDeserializer.deserializeWithJackson2(JsonObjectDeserializer.groovy:98)
at io.restassured.internal.path.json.mapping.JsonObjectDeserializer$deserializeWithJackson2.callStatic(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallStatic(CallSiteArray.java:56)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callStatic(AbstractCallSite.java:194)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callStatic(AbstractCallSite.java:214)
at io.restassured.internal.path.json.mapping.JsonObjectDeserializer.deserialize(JsonObjectDeserializer.groovy:67)
at io.restassured.path.json.JsonPath.jsonStringToObject(JsonPath.java:1016)
at io.restassured.path.json.JsonPath.getList(JsonPath.java:398)
at LearningRestAssured.RestAssured.JsonResponseUsingDeserialize.JsonPathUsage(JsonResponseUsingDeserialize.java:34)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:124)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:571)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:707)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:979)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109)
at org.testng.TestRunner.privateRun(TestRunner.java:648)
at org.testng.TestRunner.run(TestRunner.java:505)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:455)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:450)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:415)
at org.testng.SuiteRunner.run(SuiteRunner.java:364)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:84)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1187)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1116)
at org.testng.TestNG.runSuites(TestNG.java:1028)
at org.testng.TestNG.run(TestNG.java:996)
at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:114)
at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:251)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:77)

Regards,

Poovaraj

[Johan Haleby]

This is a jackson related issue, but it'll probably work if you simply add @JsonIgnoreProperties(ignoreUnknown = true) to the top-level of the Book class.

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[Poovaraj]

Hi Johan Haleby,

Thanks for your reply.

It is showing null value after adding @JsonIgnoreProperties(ignoreUnknown = true) annotation. Why is it showing null value ?

 Code :

@JsonIgnoreProperties(ignoreUnknown = true)

public class Book

{

String isbn;

    String title;

    String subtitle;

    String author;

    String published;

    String publisher;

    int pages;

    String description;  

    

    String website;

}

Output :

Book: null

Book: null

Book: null

Book: null

Book: null

Book: null

Book: null

Book: null

PASSED: JsonPathUsage

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[Poovaraj Thangamariappan]

Hi Johan Haleby,

Thanks for your reply !

It is returning "NULL" value after adding  @JsonIgnoreProperties(ignoreUnknown = true).  Why is it returning null value ?

Code :

@JsonIgnoreProperties(ignoreUnknown = true)

public class Book

{

String isbn;

    String title;

    String subtitle;

    String author;

    String published;

    String publisher;

    int pages;

    String description;  

    

    String website;

}

Output:

Book: null

Book: null

Book: null

Book: null

Book: null

Book: null

Book: null

Book: null

PASSED: JsonPathUsage

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[Johan Haleby]

Maybe if you try to log the response you'll get some hints.

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