Openfire REST Plugin : users creation with JSON failing (error 500)

I’m testing the REST plugin for Openfire (latest version -> 1.3.9, tests with Postman) and when i try to create users through the API by sending a JSON document, I got an error 500 with the following stacktrace in the logs :

Caused by: org.codehaus.jackson.map.exc.UnrecognizedPropertyException: Unrecognized field "users" (Class org.jivesoftware.openfire.plugin.rest.entity.UserEntity), not marked as ignorable
 at [Source: HttpInputOverHTTP@68a3ecb3[c=467,q=0,[0]=null,s=STREAM]; line: 2, column: 15] (through reference chain: org.jivesoftware.openfire.plugin.rest.entity.UserEntity["users"])
        at org.codehaus.jackson.map.exc.UnrecognizedPropertyException.from(UnrecognizedPropertyException.java:53) ~[?:?]
        at org.codehaus.jackson.map.deser.StdDeserializationContext.unknownFieldException(StdDeserializationContext.java:267) ~[?:?]
        at org.codehaus.jackson.map.deser.std.StdDeserializer.reportUnknownProperty(StdDeserializer.java:649) ~[?:?]
        at org.codehaus.jackson.map.deser.std.StdDeserializer.handleUnknownProperty(StdDeserializer.java:635) ~[?:?]
        at org.codehaus.jackson.map.deser.BeanDeserializer.handleUnknownProperty(BeanDeserializer.java:1355) ~[?:?]
        at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:717) ~[?:?]
        at org.codehaus.jackson.map.deser.BeanDeserializer.deserialize(BeanDeserializer.java:580) ~[?:?]
        at org.codehaus.jackson.map.ObjectMapper._readValue(ObjectMapper.java:2695) ~[?:?]
        at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1308) ~[?:?]
        at org.codehaus.jackson.jaxrs.JacksonJsonProvider.readFrom(JacksonJsonProvider.java:419) ~[?:?]
        at com.sun.jersey.json.impl.provider.entity.JacksonProviderProxy.readFrom(JacksonProviderProxy.java:139) ~[?:?]
        at com.sun.jersey.spi.container.ContainerRequest.getEntity(ContainerRequest.java:490) ~[?:?]
        at com.sun.jersey.server.impl.model.method.dispatch.EntityParamDispatchProvider$EntityInjectable.getValue(EntityParamDispatchProvider.java:123) ~[?:?]
        at com.sun.jersey.server.impl.inject.InjectableValuesProvider.getInjectableValues(InjectableValuesProvider.java:86) ~[?:?]
        at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$EntityParamInInvoker.getParams(AbstractResourceMethodDispatchProvider.java:153) ~[?:?]
        at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:203) ~[?:?]
        at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75) ~[?:?]
        at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302) ~[?:?]
        at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108) ~[?:?]
        at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147) ~[?:?]
        at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84) ~[?:?]
        at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1542) ~[?:?]
        at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1473) ~[?:?]
        at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419) ~[?:?]
        at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409) ~[?:?]
        at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409) ~[?:?]
        ... 46 more

The JSON payload :

 {
    "users": [
        {
            "username": "test",
            "name": "testname",
            "email": "test@test.com",
            "password": "password",
            "properties": [
                {
                    "key": "testkey",
                    "value": "0"
                }
            ]
        },
        {
            "username": "test2",
            "name": "test2 name",
            "password": "password"
        }
    ]
}

I also tried to create 1 user with the XML payload, and it worked correctly.

Any idea of the cause of this bug ?

Thank you