java - BeanIO - 期待される型にキャストするときの ClassCastException

Question

BeanIO で CSV ファイルを読み込んでいます。CSV で表されるオブジェクトは Field オブジェクトであり、ファイルを読み取ると、そのように返され、デバッグ ユーティリティですべて問題ないことを確認できます。ただし、オブジェクトのプロパティにアクセスするためにオブジェクトをその型に解析しようとすると、次のようにクラス キャスト例外が発生します。

java.lang.ClassCastException: util.flatfile.model.classes.Field cannot be cast to util.flatfile.model.classes.Field
    at util.csvreader.util.CSVBeanReader.read(CSVBeanReader.gs:19)
    at program_.__Program__1983.evaluate(Unknown Source)
    at gw.internal.gosu.parser.GosuProgram.runProgram(GosuProgram.java:420)
    at gw.internal.gosu.parser.GosuProgram.evaluate(GosuProgram.java:253)
    at gw.internal.gosu.parser.GosuProgram_Proxy.evaluate(gw.internal.gosu.parser.GosuProgram_Proxy:2)
    at gw.internal.gosu.parser.ExecutionEnvironment$1.evaluate(ExecutionEnvironment.java:542)
    at gw.internal.gosu.parser.ExecutionEnvironment$1.runScript(ExecutionEnvironment.java:522)
    at gw.internal.gosu.parser.ExecutionEnvironment$1.run(ExecutionEnvironment.java:488)
    at java.lang.Thread.run(Thread.java:724)

私の読み取り方法は次のとおりです

class CSVBeanReader implements BeanReader {
  override function read(): Object {
    // create a StreamFactory
    var factory = StreamFactory.newInstance()
    // load the mapping file
    factory.load("C:\\Dev\\modules\\configuration\\gsrc\\util\\csvreader\\util\\fieldMapping.xml")

    // use a StreamFactory to create a BeanReader
    using (var beanReader = factory.createReader("fields", new File("C:\\Dev\\modules\\configuration\\gsrc\\util\\csvreader\\util\\vendorDef.csv"))) {
      try {
        var field = beanReader.read()
        while (field != null) {
          print((field as Field)) //EXCEPTION OCCURS HERE

          // process the record...
          field = beanReader.read()
        }
      } catch (var e: InvalidRecordException) {
        var context = e.getRecordContext()
        if (context.hasRecordErrors()) {
          for (error in context.getRecordErrors()) {
            print("Error: ${error}")
            // handle record errors...
          }
        }
        if (context.hasFieldErrors()) {
          for (field in context.getFieldErrors().keySet()) {
            for (error in context.getFieldErrors(field)) {
              print("Error: ${error}")
              // handle field error...
            }
          }
        }
      }
    }
    return null
  }
}

私のフィールドクラス:

class Field {
  private var _startPos: int as StartPosition
  private var _length: int as Length
  private var _fieldName: String as Name
  private var _param1: String as Parameter1
  private var _format: String as Format
  private var _justify: String as Justify
  private var _fill: String as Fill
  private var _truncate: String as Truncate
  private var _stripType: String as StripType
  private var _strip: String as Strip
  private var _data: String as Data
  private var _param2: String as Parameter2
  construct() {
  }

  construct(startPos: int, fieldLength: int, fieldName: String,
            param1: String, format: String, justify: String, fill: String, truncate: String,
            stripType: String, strip: String, data: String, param2: String) {
    _startPos = startPos
    _length = fieldLength
    _fieldName = fieldName
    _param1 = param1
    _format = format
    _justify = justify
    _fill = fill
    _truncate = truncate
    _stripType = stripType
    _data = data
    _param2 = param2
  }
}

私のCSV入力：

Field,File Header,1,1,Constant,'',None,Left,' ',Right,'None','','1',''
Field,File Header,2,2,Constant,'',None,Left,'0',Right,'None','','',''
Field,File Header,4,10,Destination DDA,'',None,Right,'0',Left,'None','','',''
Field,File Header,14,10,Constant,'',None,Left,' ',Right,'None','','0111000025',''
Field,File Header,24,6,File Creation Date,'',YYMMDD,Right,'0',Left,'None','','',''
Field,File Header,30,4,File Creation Date,'',HHMM,Right,'0',Left,'None','','',''
Field,File Header,34,47,Constant,'',None,Left,' ',Right,'None','','',''

そして私のマッピングxml：

<beanio xmlns="http://www.beanio.org/2012/03"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://www.beanio.org/2012/03 http://www.beanio.org/2012/03/mapping.xsd">

    <stream name="fields" format="csv">
        <record name="field" class="util.flatfile.model.classes.Field">
            <field name="entryType" rid="true" literal="Field" ignore="true" />
            <field name="recordType" ignore="true" />
            <field name="startPosition" type="int" />
            <field name="length" type="int"/>
            <field name="name" />
            <field name="parameter1" />
            <field name="format" />
            <field name="justify" />
            <field name="fill" />
            <field name="truncate" />
            <field name="stripType" />
            <field name="strip" />
            <field name="data" />
            <field name="parameter2" />
        </record>
    </stream>

</beanio>

クラスローダーが原因である可能性が高いと読みましたが、ここで問題になる理由がわかりません。何か案は？

ありがとう