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Cannot set readonly property - when modifing attributes

Bill Lee
Posts: 20
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I am attempting to modify an attribute based on a criteria. When I attempt the following, I get

Exception in thread "main" groovy.lang.ReadOnlyPropertyException: Cannot set readonly property: value for class: java.lang.String

it.'@State'.value = 'IL'

Does anyone know how to surpass this exception? Thank.s
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