MismatchedInputException when deserializing a polymorphic class with JacksonXmlElementWrapper #308
Description
Using jackson 2.9.6, i get an exception:
com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `java.util.ArrayList` out of VALUE_STRING token
When trying to deserialize a polymorphic object with an arraylist wrapper present, when type attribute is not positioned first in XML. See the following code for an example (incorrectDeserialization test throws the exception):
package com.wrappertest;
import com.fasterxml.jackson.annotation.JsonSubTypes;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.dataformat.xml.XmlMapper;
import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlElementWrapper;
import org.junit.Test;
import java.util.ArrayList;
import java.util.Arrays;
import static com.fasterxml.jackson.annotation.JsonSubTypes.*;
import static com.fasterxml.jackson.annotation.JsonTypeInfo.*;
import static org.junit.Assert.assertEquals;
public class ListWrapperWithPolymorphicTypesTest {
/**************** classes ****************/
public static class ListWrapper {
@JacksonXmlElementWrapper(useWrapping = false)
public ArrayList<Long> item;
}
@JsonTypeInfo(use = Id.NAME, include = As.PROPERTY, property = "type")
@JsonSubTypes({
@Type(value = ChildClass.class, name = "ChildClass")
})
public static abstract class BaseClass {
public Long baseId;
}
public static class ChildClass extends BaseClass {
public ListWrapper someIds;
}
/**************** tests ****************/
private final XmlMapper xmlMapper = new XmlMapper();
@Test
public void correctDeserialization() throws Exception {
ChildClass value = (ChildClass) xmlMapper.readValue(goodXml(), BaseClass.class);
doAsserts(value);
}
@Test
public void incorrectDeserialization() throws Exception {
ChildClass value = (ChildClass) xmlMapper.readValue(badXml(), BaseClass.class);
doAsserts(value);
}
private void doAsserts(ChildClass value) {
assertEquals(Long.valueOf(123), value.baseId);
assertEquals(Arrays.asList(1L, 2L), value.someIds.item);
}
/** type attribute positioned first, works correctly */
private String goodXml() {
return "<root>" +
" <type>ChildClass</type>" +
" <baseId>123</baseId>" +
" <someIds>" +
" <item>1</item>" +
" <item>2</item>" +
" </someIds>" +
"</root>";
}
/** type attribute positioned second, throws exception when parsed */
private String badXml() {
return "<root>" +
" <baseId>123</baseId>" +
" <type>ChildClass</type>" +
" <someIds>" +
" <item>1</item>" +
" <item>2</item>" +
" </someIds>" +
"</root>";
}
}