How to Fix 'java.util.NoSuchElementException: No line found' When Reading Files in Java?

Resolving "java.util.NoSuchElementException: No line found" in Java

While utilizing a Scanner to read a file, you may encounter a "java.util.NoSuchElementException: No line found" runtime error. This exception typically occurs when you attempt to read a line that doesn't exist in the file, resulting in an attempt to read beyond the end of the file.

In your code, you utilize a Scanner (sc) to read lines from a file. Within your while loop, you call sc.nextLine() to retrieve each line. However, you do not check whether a next line exists before attempting to read it. As a consequence, when the scanner reaches the end of the file and there are no more lines to read, the exception is thrown.

To resolve this issue, you should employ the hasNextLine() method to verify if a line remains to be read before using sc.nextLine(). By incorporating this check, you can avoid attempting to read beyond the end of the file and prevent the exception from occurring.

Here's a revised version of your code with the hasNextLine() check implemented:

while (sc.hasNextLine()) {
    str = sc.nextLine();
    // ...
}

By including this check, your code will only attempt to read a line if one exists, mitigating the possibility of encountering the "No line found" exception and ensuring your program operates as intended.

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