Cannot deserialize object with EnumMap

[fabianfrz]

Hi,

there is an issue when using classes that use an EnumMap as a map implementation:

Caused by: java.lang.NoSuchMethodError: java.util.EnumMap.<init>()
	at org.glassfish.jaxb@4.0.5.redhat-00001//org.glassfish.jaxb.core.v2.ClassFactory.tryGetDeclaredConstructor(ClassFactory.java:117)
	at org.glassfish.jaxb@4.0.5.redhat-00001//org.glassfish.jaxb.core.v2.ClassFactory.create0(ClassFactory.java:78)
	at org.glassfish.jaxb@4.0.5.redhat-00001//org.glassfish.jaxb.core.v2.ClassFactory.create(ClassFactory.java:130)
	at org.glassfish.jaxb@4.0.5.redhat-00001//org.glassfish.jaxb.runtime.v2.runtime.property.SingleMapNodeProperty$1.startElement(SingleMapNodeProperty.java:129)
	at org.glassfish.jaxb@4.0.5.redhat-00001//org.glassfish.jaxb.runtime.v2.runtime.unmarshaller.UnmarshallingContext._startElement(UnmarshallingContext.java:530)
	at org.glassfish.jaxb@4.0.5.redhat-00001//org.glassfish.jaxb.runtime.v2.runtime.unmarshaller.UnmarshallingContext.startElement(UnmarshallingContext.java:509)
	at org.glassfish.jaxb@4.0.5.redhat-00001//org.glassfish.jaxb.runtime.v2.runtime.unmarshaller.StAXStreamConnector.handleStartElement(StAXStreamConnector.java:217)
	at org.glassfish.jaxb@4.0.5.redhat-00001//org.glassfish.jaxb.runtime.v2.runtime.unmarshaller.StAXStreamConnector.bridge(StAXStreamConnector.java:149)
	at org.glassfish.jaxb@4.0.5.redhat-00001//org.glassfish.jaxb.runtime.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:376)
	at org.glassfish.jaxb@4.0.5.redhat-00001//org.glassfish.jaxb.runtime.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:355)
	at org.apache.cxf.impl//org.apache.cxf.jaxb.JAXBEncoderDecoder.doUnmarshal(JAXBEncoderDecoder.java:880)
	at org.apache.cxf.impl//org.apache.cxf.jaxb.JAXBEncoderDecoder$3.run(JAXBEncoderDecoder.java:919)

In case of an EnumMap, you cannot use a default constructor because it does not exist, the enum needs to be passed down as the first argument. Since this is a JDK-Internal and linters such as Sonarqube suggest using it, It would be good if this special case could be handled.

This happens on a JBoss 8.1 application server and as you can see on calling an endpoint using CXF.

For example if you have an enum Alphabeth, you would make it look like this:

var x = new EnumMap<Alphabeth, String>(Alphabeth.class);
x.put(Alphabeth.A, "Test");

[laurentschoelens]

Hi @fabianfrz

Could you share MRE please ?
I'd like to see how you specify EnumMap in the POJO for unmarshalling

Thanks

[fabianfrz]

What is an MRE?

the class that was affected looked like this:

package com.xxx;

import java.util.EnumMap;
import java.util.HashMap;
import java.util.Map;
import jakarta.xml.bind.annotation.XmlType;

@XmlType
public class ExampleClass {
    private EnumMap<ExampleEnum, Object> restrictions;

    public Map<ExampleEnum, Object> getRestrictions() {
        if (restrictions == null) {
            restrictions = new EnumMap<>(ExampleEnum.class);
        }
        return restrictions;
    }
}

I truncated all the unrelated things and anonymized the class.

[laurentschoelens]

MRE = Minimal Reproducible Example : it looks like some minimal maven project with some code to run that reproduce the issue

[fabianfrz]

Sure:

jaxrs-deserialization-issue.zip

a sh script to curl the endpoint in JBoss 8.1 is included.

[laurentschoelens]

So I should deploy this into a JBoss server ? I don't see any xml annotation ? Is MRE complete ?

[laurentschoelens]

Got this exception in current Wildfly which is the same as yours but with unrelated link with jaxb-ri

Caused by: java.lang.NoSuchMethodException: java.util.EnumMap.<init>()
	at java.base/java.lang.Class.getConstructor0(Class.java:3585)
	at java.base/java.lang.Class.getDeclaredConstructor(Class.java:2754)
	at org.eclipse.yasson//org.eclipse.yasson.internal.ReflectionUtils.lambda$getDefaultConstructor$1(ReflectionUtils.java:301)
	... 96 more