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Editorial Team
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Asked: 2026-06-15T14:55:59+00:00

I have a Message class like this: class Message { @JsonProperty(content) Object content; }

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I have a Message class like this:

class Message {
   @JsonProperty("content")
   Object content;
}

where the content attribute can be a User, a Post, or a String
and I have to send this object to the server and cast the content to the right class.

I’m using Jackson annotations to serialize the JSON, but when I try to cast the content, an error appears, because the attribute content arrives in the server like a LinkedHashMap object.

The error is:

ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/MegaRadarSocial].[Resteasy]] (http-localhost-127.0.0.1-8080-1) Servlet.service() for servlet Resteasy threw exception: org.jboss.resteasy.spi.UnhandledException: java.lang.ClassCastException: java.util.LinkedHashMap cannot be cast to br.com.megaradar.megaradarsocial.model.User

I would like a help to casting…
Thanks

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1 Answer

  1. Editorial Team

    Thank you for all the answers. But I found another way to convert my Object to any type I want.
    I’m using the method convertValue from the ObjectMapper object. Then, I can simulate the casting.

    Thanks again

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