Jersey returns 404 with any error status code?

The default behavior with Jersey, when there is an error status (4xx, 5xx), is to use the servlet’s Response.sendError, which results in a redirect to an error page. Since there is no error page set up, it results in a 404.

We can change this behavior by setting the Jersey property

ServerProperties.RESPONSE_SET_STATUS_OVER_SEND_ERROR

You can do this in your ResourceConfig subclass

public JerseyConfig extends ResourceConfig {
    public JerseyConfig() {
        property(ServerProperties.RESPONSE_SET_STATUS_OVER_SEND_ERROR, true);
    }
}

Or (with Spring Boot) you can add it in your application.properties file.

spring.jersey.init.jersey.config.server.response.setStatusOverSendError=true