mule - Mule で datamapper を使用して日付をマップしているときにスローされるエラー

Question

以下は、データマッパーでのマッピングの一部です

dateTimeFormatter = new java.text.SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss"); output.Date_of_Rate_Float__c = (isnull(input.Date_of_Rate_Float) ? null : dateTimeFormatter.format(input.Date_of_Rate_Float)); output.Loan_Create_Date__c = (isnull(input.loan_create_date) ? null : dateTimeFormatter.format(input.loan_create_date)); output.Estimated_Closing_Date__c = (isnull(input.estimated_closed_date) ? null : dateTimeFormatter.format(input.estimated_closed_date));

これは以下の例外をスローします

1. DateConverter does not support default String to 'Date' conversion. (org.apache.commons.beanutils.ConversionException)
  org.apache.commons.beanutils.converters.DateTimeConverter:468 (null)

Root Exception stack trace:
org.apache.commons.beanutils.ConversionException: DateConverter does not support default String to 'Date' conversion.
    at org.apache.commons.beanutils.converters.DateTimeConverter.toDate(DateTimeConverter.java:468)
    at org.apache.commons.beanutils.converters.DateTimeConverter.convertToType(DateTimeConverter.java:343)
    at org.apache.commons.beanutils.converters.AbstractConverter.convert(AbstractConverter.java:156)
    at org.apache.commons.beanutils.ConvertUtilsBean.convert(ConvertUtilsBean.java:544)
    at com.mulesoft.datamapper.transform.converter.ScalarValueConversion.convert(ScalarValueConversion.java:126)
    at com.mulesoft.datamapper.transform.DataRecordContext.put(DataRecordContext.java:87)
    at com.mulesoft.datamapper.transform.DataRecordContext.put(DataRecordContext.java:24)
    at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeSetAccessor(ReflectiveAccessorOptimizer.java:308)
    at org.mvel2.compiler.CompiledAccExpression.setValue(CompiledAccExpression.java:54)
    at org.mvel2.ast.DeepAssignmentNode.getReducedValueAccelerated(DeepAssignmentNode.java:92)
    at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85)
    at org.mvel2.compiler.CompiledExpression.getDirectValue(CompiledExpression.java:123)
    at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:119)
    at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:113)
    at org.mvel2.MVEL.executeExpression(MVEL.java:942)
    at org.mule.el.mvel.MVELExpressionExecutor.execute(MVELExpressionExecutor.java:50)
    at com.mulesoft.datamapper.transform.DataMapperExpressionLanguage.evaluate(DataMapperExpressionLanguage.java:106)
    at com.mulesoft.datamapper.transform.MelRecordTransform.transform(MelRecordTransform.java:56)
    at org.jetel.component.Reformat.execute(Reformat.java:273)
    at org.jetel.graph.Node.run(Node.java:465)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:724)

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この例外の原因を特定できません。この問題を解決するために助けを求めたいと思います。

前もって感謝します