我有一个Java方法，它以InputStream的形式获取JSON格式的客户信息列表。我想将 Package 器添加到这个JSON中，它是使用Jackson JsonGenerator创建的。当我尝试将customerList添加为树时，得到错误java.lang.IllegalStateException: No ObjectCodec defined
下面是通过我的方法获得的客户列表：

[
  {
    "name":"Batman",
    "age":45,
    "city":"gotham"
  },
  {
    "name":"superman",
    "age":50,
    "city":"moon"
  }
]

我想添加一个 Package ，并使它像这样：

{
  "isA": "customerDocument",
  "createdOn": "2022-10-10T12:29:43",
  "customerBody": {
    "customerList": [
      {
        "name": "Batman",
        "age": 45,
        "city": "gotham"
      },
      {
        "name": "superman",
        "age": 50,
        "city": "moon"
      }
    ]
  }
}

以下是我的方法：

private InputStream generateJsonDocumentWrapper(final InputStream inputEventList) throws IOException {
      final PipedInputStream jsonDocumentWriter = new PipedInputStream();
      final PipedOutputStream out = new PipedOutputStream(jsonDocumentWriter);
      final ExecutorService executorService = Executors.newWorkStealingPool();
      final JsonParser jsonParser = new JsonFactory().createParser(inputEventList);
      final ObjectMapper objectMapper = new ObjectMapper().registerModule(new JavaTimeModule()).enable(DeserializationFeature.FAIL_ON_TRAILING_TOKENS);
      jsonParser.setCodec(objectMapper);
      final JsonNode node = jsonParser.readValueAsTree();
      System.out.println(objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(node));

      executorService.execute( () -> {
          try{
              try (JsonGenerator jsonGenerator = jsonfactory.createGenerator(out)) {
                  jsonGenerator.writeStartObject();
                  jsonGenerator.writeStringField("type", "customerDocument");
                  jsonGenerator.writeStringField("creationDate", Instant.now().toString());
                  jsonGenerator.writeFieldName("customerBody");
                  jsonGenerator.writeStartObject();
                  jsonGenerator.writeFieldName("customerList")
                  jsonGenerator.writeRaw(":")
                  jsonGenerator.writeTree(node); // works fine with jsonGenerator.writeRawValue(IOUtils.toString(inputEventList, StandardCharsets.UTF_8));
                  jsonGenerator.writeEndObject();
                  jsonGenerator.writeEndObject();
                  jsonGenerator.flush();
              } catch (IOException ex) {
                  throw new IOException();
              }
          }catch (Exception ex) {
              ex.printStackTrace();
          }
      });

    System.out.println("Wrpper DOCUMENT : " + IOUtils.toString(jsonDocumentWriter, StandardCharsets.UTF_8));
    return jsonDocumentWriter;
  }

如果我将InputStream直接转换为String，则它工作正常，但我不想使用IOUtils.toString(inputEventList, StandardCharsets.UTF_8)，因此我尝试读取为树，但这会导致以下错误：

java.lang.IllegalStateException: No ObjectCodec defined

        at com.fasterxml.jackson.core.base.GeneratorBase.writeTree(GeneratorBase.java:403)
        at my.package.CustomerWrapperGenerator.lambda$generateJsonDocumentWrapper$4(CustomerWrapperGenerator.java:319)
        at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1395)
        at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373)