@JsonProperty(value="Contact")
    @NotNull(message = "ContactUser or CompanyName is required.")
    @Valid
    @XmlElements(value = {
            @XmlElement(name = "ContactUser", type = ContactUser.class, required = true),
            @XmlElement(name = "CompanyName", type = String.class, required = true) })
    private Object contactInfo;

"Contact":{
"ContactUser":{
"Title": "Miss",
"LastName": "Hello"
}
}

"Contact": "Hello Company"

"ContactUser":{
"Title": "Miss",
"LastName": "Hello"
}

"CompanyName": "Hello Company"

<CompanyName>Hello Company</CompanyName>

<ContactUser>
        <Title>Miss</Title>
        <LastName>Hello</LastName>
         </ContactUser>

@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include =JsonTypeInfo.As.WRAPPER_OBJECT, visible=true)
    @JsonSubTypes({
        @JsonSubTypes.Type(name = "ContactUserJ", value = ContactUser.class),
        @JsonSubTypes.Type(name = "CompanyNameJ" , value = String.class)
    })