Deserialization fails for Xstream 1.4.20 and Jettisons 1.5.3

Question

I've below code which deserializes my code and returns a HashMap for Jettisons version 1.2.

But when I switched the jettisons to 1.5.3 this code breaks with the exception mentioned below.

Can someone please help?

--main.class

package org.example;

import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.json.JettisonMappedXmlDriver;

import java.io.*;
import java.util.HashMap;
import java.util.Map;

public class Main {
    public static void main(String[] args) throws IOException {
        Person person = new Person(22,"Nikhil","India");
        Map<String,Object> map = new HashMap<>();

        map.put("Person1",person);

        XStream xStream =  new XStream(new JettisonMappedXmlDriver());
        xStream.allowTypes(new Class[]{Person.class});
        //1003
        String str = xStream.toXML(map);

        System.out.println("toXML ==> " + str);
        Map<String,Object> map1 = (Map<String,Object>)xStream.fromXML(str);
        System.out.println("fromXML ==> " + map1);
    }
}

--person.class

package org.example;

public class Person {
    private int age;
    private String name,address;

    public Person(int age, String name, String address) {
        this.age = age;
        this.name = name;
        this.address = address;
    }

    public Person() {
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }
}

--output for 1.2 jettisons

toXML ==> {"map":[{"entry":{"string":"Person1","org.example.Person":{"age":22,"name":"Nikhil","address":"India"}}}]}
fromXML ==> {Person1=org.example.Person@d4342c2}

--output for 1.5.3 jettisons

toXML ==> {"map":[{"entry":{"string":"Person1","org.example.Person":{"age":22,"name":"Nikhil","address":"India"}}}]}
Exception in thread "main" com.thoughtworks.xstream.converters.ConversionException: Cannot construct type
---- Debugging information ----
message             : Cannot construct type
cause-exception     : java.lang.InstantiationException
cause-message       : java.util.Map$Entry
construction-type   : java.util.Map$Entry
class               : java.util.Map$Entry
required-type       : java.util.Map$Entry
converter-type      : com.thoughtworks.xstream.converters.reflection.ReflectionConverter
path                : /map/map/entry
line number         : -1
class[1]            : java.util.HashMap
required-type[1]    : java.util.HashMap
converter-type[1]   : com.thoughtworks.xstream.converters.collections.MapConverter
version             : 1.4.20
-------------------------------
    at com.thoughtworks.xstream.converters.reflection.SunLimitedUnsafeReflectionProvider.newInstance(SunLimitedUnsafeReflectionProvider.java:89)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.instantiateNewInstance(AbstractReflectionConverter.java:580)
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:276)
    at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:74)
    at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:72)
    at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:68)
    at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:52)
    at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.readBareItem(AbstractCollectionConverter.java:132)
    at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.readItem(AbstractCollectionConverter.java:117)
    at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.readCompleteItem(AbstractCollectionConverter.java:147)
    at com.thoughtworks.xstream.converters.collections.MapConverter.putCurrentEntryIntoMap(MapConverter.java:106)
    at com.thoughtworks.xstream.converters.collections.MapConverter.populateMap(MapConverter.java:99)
    at com.thoughtworks.xstream.converters.collections.MapConverter.populateMap(MapConverter.java:93)
    at com.thoughtworks.xstream.converters.collections.MapConverter.unmarshal(MapConverter.java:88)
    at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:74)
    at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:72)
    at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:68)
    at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:52)
    at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:136)
    at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32)
    at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1464)
    at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1441)
    at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1321)
    at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1312)
    at org.example.Main.main(Main.java:23)
Caused by: java.lang.InstantiationException: java.util.Map$Entry
    at java.base/jdk.internal.misc.Unsafe.allocateInstance(Native Method)
    at jdk.unsupported/sun.misc.Unsafe.allocateInstance(Unsafe.java:839)
    at com.thoughtworks.xstream.converters.reflection.SunLimitedUnsafeReflectionProvider.newInstance(SunLimitedUnsafeReflectionProvider.java:85)
    ... 24 more

I've tried to ObjectMapper by Jackson, but it returns a LinkedHashMap while deserialization. I'm expecting a HashMap.

Deserialization fails for Xstream 1.4.20 and Jettisons 1.5.3

0 Answers0