Fix NumberFormatException when displaying errors/messages in JSP #399
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Replace EL expression `${errors.class.simpleName}` with scriptlet-based
type checking to avoid NumberFormatException in modern EL resolvers.
The issue occurred because when `errors` is a List, the EL resolver
tries to interpret `.class` as a list index access, attempting to parse
"class" as an integer, which fails with NumberFormatException.
Co-authored-by: rvosa <[email protected]>
…tion Fix NumberFormatException in messages.jsp type checking
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