Web Reference: There is clearly a problem with outputting String.format to the str variable, but I don't know what's wrong with it. at java.util.Formatter$FormatSpecifier.conversion(Unknown Source) at java.util.Formatter$FormatSpecifier.(Unknown Source) at java.util.Formatter.parse(Unknown Source) at java.util.Formatter.format(Unknown Source) Jan 16, 2026 · One common issue is java.util.UnknownFormatConversionException, which occurs when the format string contains an invalid or unrecognized conversion specifier. This blog post will demystify UnknownFormatConversionException, explore its root causes, and provide step-by-step solutions to fix it. Unchecked exception thrown when an unknown conversion is given. Unless otherwise specified, passing a null argument to any method or constructor in this class will cause a NullPointerException to be thrown. Constructs an instance of this class with the unknown conversion. Returns the unknown conversion.
YouTube Excerpt: Learn how to resolve the `
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