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NoSuchMethodError error with Retrofit GET request

I am supposed to simply send a get-request to an endpoint and retrieve the data, and had success with post-request version of this code. However, it doesn't seem to work for GET. I have a simple model which is like this
public class Brand {
private String id;
private String name;
public Brand(String id, String name) {
this.id = id;
this.name = name;
}}
And my repository
import okhttp3.ResponseBody;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.http.*;
import java.util.List;
public interface Service {
#Headers({ "Accept: application/json" })
#GET("/brands")
Call<List<Brand>> getBrandList();
#Headers("Content-Type:application/json")
#POST("/login/email")
Call<ResponseBody> login(#Body LoginInfo loginInfo);
}
And finally this is where I try to run
import retrofit2.Call;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;
import java.io.IOException;
import java.util.List;
public class BrandRepoImp {
private static final String apiUrl = "http://example.com/grc/main/";
public static void main(String... args) throws IOException {
BrandRepoImp app=new BrandRepoImp();
app.getBrandList();
}
public void getBrandList() throws IOException {
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(apiUrl)
.addConverterFactory(GsonConverterFactory.create())
.build();
Service resource = retrofit.create(Service.class);
Call<List<Brand>> brands = resource.getBrandList();
System.out.println(brands.execute().body());
}
}
It returns this error
Exception in thread "main" java.lang.NoSuchMethodError: okio.BufferedSource.rangeEquals(JLokio/ByteString;)Z
at okhttp3.internal.Util.bomAwareCharset(Util.java:431)
at okhttp3.ResponseBody$BomAwareReader.read(ResponseBody.java:249)
at com.google.gson.stream.JsonReader.fillBuffer(JsonReader.java:1295)
at com.google.gson.stream.JsonReader.nextNonWhitespace(JsonReader.java:1333)
at com.google.gson.stream.JsonReader.doPeek(JsonReader.java:549)
at com.google.gson.stream.JsonReader.peek(JsonReader.java:425)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:74)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:61)
at retrofit2.converter.gson.GsonResponseBodyConverter.convert(GsonResponseBodyConverter.java:37)
at retrofit2.converter.gson.GsonResponseBodyConverter.convert(GsonResponseBodyConverter.java:25)
at retrofit2.ServiceMethod.toResponse(ServiceMethod.java:119)
at retrofit2.OkHttpCall.parseResponse(OkHttpCall.java:218)
at retrofit2.OkHttpCall.execute(OkHttpCall.java:180)
at com.retrofitexample.demo.login.BrandRepoImp.getBrandList(BrandRepoImp.java:27)
at com.retrofitexample.demo.login.BrandRepoImp.main(BrandRepoImp.java:17)
Process finished with exit code 1

How to fix this JsonMappingException: N/A during XML deserialization

Here are my bean classes:
package request;
import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlElementWrapper;
import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlProperty;
import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlRootElement;
#JacksonXmlRootElement
public class Employee {
private List<String> roles= new ArrayList<String>();
private String name;
public Employee(){}
#JacksonXmlProperty
public String getName ()
{
return name;
}
public void setName (String name)
{
this.name = name;
}
#JacksonXmlElementWrapper(useWrapping=false)
#JacksonXmlProperty
public List<String> getRoles ()
{
return roleCodes;
}
public void setRoles (String role)
{
this.roles.add(role);
}
}
and,
package request;
import java.util.ArrayList;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlElementWrapper;
import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlProperty;
import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlRootElement;
public class Employees
{
#JacksonXmlElementWrapper(localName="employees")
#JacksonXmlProperty(localName="employee")
private ArrayList<Employee> emps;
//Employee Employee ;
public Employees(){}
#JacksonXmlProperty(localName="employee")
public ArrayList<Employee> getEmployees ()
{
return emps;
}
public void setEmployees(Employee emp){
this.emps.add(emp);
}
#Override
public String toString()
{
if(emps.isEmpty()!=true)
for (Employee e:emps)
return "this is [employee = "+e ;
return "none there";
}
public ArrayList<Employee> addingEmployee(Employee e){
this.emps.add(e);
return emps;
}
}
And here is the code to parse the xml into POJO:
package testPkg4;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import com.fasterxml.jackson.dataformat.xml.XmlMapper;
import request.Bean;
import request.Employee;
import request.Employees;
public class Test4 {
public static void main(String[] args) {
XmlMapper xmlMapper = new XmlMapper();
//Bean value = new Bean();
Employees emps=new Employees();
try {
emps = xmlMapper.readValue(new File("D:\\workspace\\test\\src\\test\\resources\\employee.xml"),
Employees.class);
} catch (IOException ex) {
// TODO Auto-generated catch block
ex.printStackTrace();
}
System.out.println(emps.getEmployees().get(0).getFirstName());
//System.out.println(e.getFirstName());
//System.out.println(emps.getEmployees().get(0).getThirdElement());
}
}
Now here is the error I am getting :
com.fasterxml.jackson.databind.JsonMappingException: N/A at [Source:
D:\workspace\test\src\test\resources\employee.xml; line: 5, column:
12] (through reference chain: request.Employees["employee"]) at
com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:277)
at
com.fasterxml.jackson.databind.deser.SettableBeanProperty._throwAsIOE(SettableBeanProperty.java:551)
at
com.fasterxml.jackson.databind.deser.SettableBeanProperty._throwAsIOE(SettableBeanProperty.java:532)
at
com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:108)
at
com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:276)
at
com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:140)
at
com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3814)
at
com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2756)
at testPkg4.Test4.main(Test4.java:23) Caused by:
java.lang.NullPointerException at
request.Employees.setEmployees(Employees.java:31) at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at
java.lang.reflect.Method.invoke(Unknown Source) at
com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:106)
... 5 more Exception in thread "main" java.lang.NullPointerException
at testPkg4.Test4.main(Test4.java:29)
while i am parsing thsi xml file:
<employees>
<employee>
<name>ASHISH</name>
<roles>MD</roles>
</employee>
<employee>
<name>BAHADUR</name>
<roles>CO</roles>
<roles>TM</roles>
</employee>
</employees>
Can anyone help me figure out what's the issue!

Found an useful tutorial to create custom untyped xml deserializer which helped me overcome it .
and in case of serialization create java classes from schema using jaxb2-maven-pluging as a build plug in .
org.codehaus.mojo
jaxb2-maven-plugin
1.5
xjc
-extension -npa -b ${project.basedir}/src/main/xsd/global.xjb
** if you are using jackson library then either replace the annotations with the jackson alternatives for jaxb annotaions . or register the jaxbannotation module into your serializer .
Here is the link for the gist that helped me .

Get attribute from Restful XML without tags in client

I want to get the attribute value from XML output that is being created by my Rest Web Service but without the tags in my Java client. I tried XPath but it doesn't seem to work with URLs, only with XML files that are stored in the drive. And all the answers about XPath are specifically for stored XML files not online. I am using Netbeans. The concept is, web service takes two numbers and provides the sum as an XML. Webservice url that I use in this example http://localhost:8080/WSDemo/rest/book/5/2
Rest Web service
ApplicationConfig.java
package wbs;
import java.util.Set;
import javax.ws.rs.core.Application;
import javax.xml.bind.annotation.XmlRootElement;
#javax.ws.rs.ApplicationPath("rest")
public class ApplicationConfig extends Application {
#Override
public Set<Class<?>> getClasses() {
Set<Class<?>> resources = new java.util.HashSet<>();
addRestResourceClasses(resources);
return resources;
}
private void addRestResourceClasses(Set<Class<?>> resources) {
resources.add(wbs.GenericResource.class);
}
}
GenericResource.java
package wbs;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.UriInfo;
import javax.ws.rs.Produces;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.core.MediaType;
import javax.xml.bind.annotation.XmlRootElement;
#Path("book")
public class GenericResource {
#Context
private UriInfo context;
#GET
#Produces(MediaType.APPLICATION_XML)
#Path("{n1}/{n2}")
public String getSum(#PathParam ("n1") int a, #PathParam ("n2") int b) {
int c = a+b;
return "<Sum>" + c + "</Sum>";
}
}
Client
Sum.java
package restclient;
import javax.ws.rs.ClientErrorException;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.WebTarget;
public class Sum {
private WebTarget webTarget;
private Client client;
private static final String BASE_URI = "http://localhost:8080/WSDemo/rest/";
public Sum(){
client = javax.ws.rs.client.ClientBuilder.newClient();
webTarget = client.target(BASE_URI).path("book");
}
public <T> T getSum(Class<T> responseType, String n1, String n2) throws ClientErrorException {
WebTarget resource = webTarget;
resource = resource.path(java.text.MessageFormat.format("{0}/{1}", new Object[]{n1, n2}));
return resource.request(javax.ws.rs.core.MediaType.APPLICATION_XML).get(responseType);
}
public void putXml(Object requestEntity) throws ClientErrorException {
webTarget.request(javax.ws.rs.core.MediaType.APPLICATION_XML).put(javax.ws.rs.client.Entity.entity(requestEntity, javax.ws.rs.core.MediaType.APPLICATION_XML));
}
public void close() {
client.close();
}
}
RestClient.java
package com.emmanouil;
import restclient.Sum;
public class RestClient {
public static void main(String[] args) {
Sum client = new Sum();
String response = client.getSum (String.class,"5" , "2");
System.out.println(response);
client.close();
}
}
Output
I want to clear the tags and get the result (7 in this case). Of course, I can trim the string or any other other similar way but it's something that I don't want to do.

XML to POJO Mapping

I have a service that does the following:
receives different XML requests
turns them into JIBX-generated Java objects
maps the JIBX-generated Java objects into POJOs
sends the POJOs to another service
gets a POJO response back
maps POJO back into JIBX-generated Java objects
turns JIBX-generated Java objects back into XML
returns XML to client.
I'd like to make this process more efficient. Can anyone suggest how? Can JIBX map directly into my POJOs?

Yes Jibx can map directly to your POJOs using Jibx mapping files. I think the below link will be very helpful to understand Jibx binding.
Jibx Introduction

In this you needed library which is available in the url(4shared.com) commented in comments.
package com.xml.Sample.MainP;
import java.io.File;
import java.util.List;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import com.xml.Sample.Actions.XMLAction;
import com.xml.Sample.Model.States;
public class Retrieve {
public static String XMLModelName = "com.xml.Sample.Model.States";
private static String cities = "E:\\Webeclipseworkspace\\Samples\\src\\Srates.xml";
public static void main(String[] args) {
try {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
File f = new File(cities);
Document doc = db.parse(f);
doc.getDocumentElement().normalize();
XMLAction xmla = new XMLAction();
List<States> listXML = xmla.readData(XMLModelName, doc);
// System.out.println(listXML);
String xmlData = xmla.writtingData(listXML);
System.out.println(xmlData);
} catch (Exception e) {
// TODO: handle exception
System.out.println(e);
}
}
}
package com.xml.Sample.Model;
import com.xml.Sample.XMLAnn.XMLColumn;
import com.xml.Sample.XMLAnn.XMLReport;
#XMLReport(reportName = "row")
public class Directory {
private String city_id;
private String city_name;
private String state_id;
#XMLColumn(label = "city_id")
public String getCity_id() {
return city_id;
}
public void setCity_id(String city_id) {
this.city_id = city_id;
}
#XMLColumn(label = "city_name")
public String getCity_name() {
return city_name;
}
public void setCity_name(String city_name) {
this.city_name = city_name;
}
#XMLColumn(label = "state_id")
public String getState_id() {
return state_id;
}
public void setState_id(String state_id) {
this.state_id = state_id;
}
}
Here I Created Own Library For Converting Pojo classes to xml and xml to pojo classes.
Use Below Link(4Shared.com) at Comments to download Library to add for The Above Code.

String(XML in String) to List
1. FolderItem.java
<code>
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
#XmlAccessorType(XmlAccessType.FIELD)
public class FolderItem {
long itemId ;
String itemName;
String itemType;
String description;
String[] tags;
String path;
/* setters and getters
Annotations not required*/
}
</code>
2. FolderItems.java
<code>
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
#XmlRootElement
#XmlAccessorType(XmlAccessType.FIELD)
public class FolderItems {
#XmlElement
private List<FolderItem> folderItem;
/* setter and getter */
}
</code>
3. Testing--main method
<code>
class Test{
public static void main(String[] args) throws Exception {
FolderItems f = (FolderItems)strToVo(content, FolderItems.class);
System.out.println(f);
}
static Object strToVo(String content, Class c) throws JAXBException {
JAXBContext jc = JAXBContext.newInstance(c);
Unmarshaller unmarshaller = jc.createUnmarshaller();
return unmarshaller.unmarshal(new InputSource(new StringReader(content)));
}
}
</code>
4. XML in String
<code>
<?xml version='1.0' encoding='UTF-8' standalone='yes'?>
<FolderItems>
<folderItem>
<description>Lapse notice invoice for additional interests/additional insureds</description>
<itemId>480004439</itemId>
<itemName>Lapse_Invoice_AI</itemName>
<itemType>application/x-thunderhead-ddv</itemType>
<path>/Templates/Billing Center/Lapse_Invoice_AI</path>
<tags></tags>
</folderItem>
</FolderItems>
</code>

Can't construct a java object for tag:yaml.org,2002:

When I am trying to create an object from a data file, I am getting the following exception while assest class is present. I have tried with dum; it was able to dump the data but when I have tried to read same data I am getting the following exception:
[ConstructorException: null; Can't construct a java object for tag:yaml.org,2002:model.Asset; exception=Class not found: model.Asset]
File reader:
package utill;
import org.yaml.snakeyaml.Yaml;
import java.io.File;
import java.io.FileInputStream;
import java.io.*;
import java.io.InputStream;
import java.util.*;
import model.*;
import java.util.LinkedHashMap;
import org.yaml.snakeyaml.constructor.Constructor;
public class FileReaderUtill {
public static List getAssest(String fileName){
LinkedHashMap<String,Asset> assest=null;
List<Asset> data= new ArrayList<Asset>();
try{
InputStream input = new FileInputStream(new
File("conf/datafile.yaml"));
Yaml yaml = new Yaml();
data=(List<Asset>)yaml.load(input);
//System.out.println(assest.get("Asset0"));
}catch(IOException e){
e.printStackTrace();
}
return data;
}
}
Datafile.yaml
- !!model.Asset {cid: null, enable: '1', id: re, internalName: df, name: fd}
- !!model.Asset {cid: null, enable: '0', id: rexz, internalName: dxxf, name: fdxxx}
Assest.java
package model;
public class Asset {
public Asset(){
}
public Asset(String id,String cid,String name,String internalName,String enable ){
this.id=id;
this.name=name;
this.internalName=internalName;
this.enable=enable;
}
public String id;
public String cid;
public String name;
public String internalName;
public String enable;
}
Please help me solve this issue.