关于 java:ConverterNotFoundException 在 spring 集成中将字符串对象发送到 rest 服务

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<int-http:outbound-gateway id="xtifygateway"
        request-channel="requestchannel" request-factory="requestFactory"
        url="${xtifyUrl}" http-method="POST">
</int-http:outbound-gateway>

<int:header-enricher input-channel="requestchannel">
    <int:header name="Content-Type" value="application/json"/>
</int:header-enricher>

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public interface RequestGateway
{
    ResponseEntity< ? > pushNotification(String xtifyRequest);
}

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  ObjectMapper objectMapper = new ObjectMapper();
  try {
      String xtifyJson = objectMapper.writeValueAsString(xtifyRequest);
  }

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     <xsd:attribute name="expected-response-type" type="xsd:string">
        <xsd:annotation>
            <xsd:documentation>
                The expected type to which the response body should be converted.
                Default is 'org.springframework.http.ResponseEntity'.
                This attribute cannot be provided if expected-response-type-expression has a value
            </xsd:documentation>
            <xsd:appinfo>
                <tool:annotation kind="direct">
                    <tool:expected-type type="java.lang.Class" />
                </tool:annotation>
            </xsd:appinfo>
        </xsd:annotation>
    </xsd:attribute>