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sandeepkumarn0001
Known Participant
May 5, 2023
Question

An error occurred while executing a save: java.lang.ClassCastException: com.appiancorp.core.expr.portable.Value cannot be cast to com.appiancorp.core.data.Variant

  • May 5, 2023
  • 7 replies
  • 10 views

Hi,

Sometimes on UI getting the below error:

Expression evaluation error [evaluation ID = 19742:9c777] in rule 'Test_Rule' at function a!dropdownField [line 314]: An error occurred while executing a save: java.lang.ClassCastException: com.appiancorp.core.expr.portable.Value cannot be cast to com.appiancorp.core.data.Variant

Please provide some guidance on the above error to fix.

Regards,
Sandeep

    7 replies

    L
    laurensw425805
    Participating Frequently
    May 5, 2023

    The error points out that when you select a dropdown value (of the dropdown component at line 314), a save is executed in which the target type and value type do not line up.

    i.e. you are trying to save some value of type A into a target that expects type B value.

    This obviously will not work.

    S
    sanchitg0002
    Inspiring
    May 5, 2023

    Error message itself is a clear guidance. If you can share the code snippet we might help you solve this error faster.

    S
    sandeepkumarn0001Author
    Known Participant
    May 5, 2023

    Thank you Laurens and Sanchit,

    Please review the attached code:

    a!localVariables(
  local!id,
  local!unionChoicelabels: union("A", "A", "B", "B"),
  local!unionChoiceValues: union(1, 1, 2, 2),
  local!number,
  local!Detail: 
  cast(
    typeof(
      'type!{urn:com:appian:types:AAA}AAA_Details'()
    ),
    {}
  ),
  a!dropdownField(
    label: "Select SMT",
    labelPosition: "JUSTIFIED",
    helpTooltip: "Select the name of the SMT",
    placeholder: "Select SMT",
    choiceLabels: local!unionChoicelabels,
    choiceValues: local!unionChoiceValues,
    value: local!id,
    saveInto: {
      local!id,
      a!save(local!number, null),
      a!save(local!Detail.id, local!id)
    },
    required: true,
    validations: {}
  )
)

    S
    sanchitg0002
    Inspiring
    May 5, 2023

    This piece of code looks fine and working. You might mind sharing the actual code where the error occurs at line 314.

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