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A method is called that expects a Java printf format string and a list of arguments. However, the format string doesn't contain any format specifiers (e.g., %s) but does contain message format elements (e.g., {0}). It is likely that the code is supplying a MessageFormat string when a printf-style format string is required. At runtime, all of the arguments will be ignored and the format string will be returned exactly as provided without any formatting.