我在 spring-kafka 中使用 JsonSerializer 和 JsonDeserializer 在生成消息时设置值序列化器。该消息有一个字段（orgName），其中包含一个特殊字符（德语变音）。我该如何处理这个特殊字符？我知道 JsonDeserializer 使用 jackson 并且 jackson 支持 utf-8。JsonDeserializer 因为它而抛出这个错误：
Caused by: com.fasterxml.jackson.databind.JsonMappingException: Invalid UTF-8 middle byte 0x72
at [Source: [B@403d4534; line: 1, column: 128]
at [Source: [B@403d4534; line: 1, column: 116] (through reference chain: com.abc-company.kafka.JobRequest["orgName"])
at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:388) ~[jackson-databind-2.8.5.jar:2.8.5]
at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:348) ~[jackson-databind-2.8.5.jar:2.8.5]
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.wrapAndThrow(BeanDeserializerBase.java:1599) ~[jackson-databind-2.8.5.jar:2.8.5]
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:359) ~[jackson-databind-2.8.5.jar:2.8.5]
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:148) ~[jackson-databind-2.8.5.jar:2.8.5]
at com.fasterxml.jackson.databind.ObjectReader._bindAndClose(ObjectReader.java:1626) ~[jackson-databind-2.8.5.jar:2.8.5]
at com.fasterxml.jackson.databind.ObjectReader.readValue(ObjectReader.java:1237) ~[jackson-databind-2.8.5.jar:2.8.5]
at org.springframework.kafka.support.serializer.JsonDeserializer.deserialize(JsonDeserializer.java:86) ~[spring-kafka-1.1.2.RELEASE.jar:na]