ERROR - org.apache.wicket.util.string.StringValueConversionException - Possible Causes of StringValueConversionException

Exception Thrown By:Cause
FrameworkClassMethod
Apache Wicket Strings public static Boolean toBoolean(String s) when s is
not a valid value.
Apache Wicket Strings public static char toChar(String s) when the string is
longer or shorter than 1 character.