import java.io.BufferedReader;

import java.io.FileReader;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class LogErrorScanner {

public static List<String> scanLogFile(String filePath) {

List<String> errors = new ArrayList<>();

try (BufferedReader reader = new BufferedReader(new FileReader(filePath))) {

String line;

Pattern errorPattern = Pattern.compile("ERROR|Exception|Failed"); //Basic error keyword regex

while ((line = reader.readLine()) != null) {

Matcher matcher = errorPattern.matcher(line);

if (matcher.find()) {

errors.add(line); // Add the line to the list

}

}

} catch (IOException e) {

System.err.println("Error reading file: " + e.getMessage());

}

return errors;

}

public static void main(String[] args) {

// Example usage:

String logFilePath = "sample.log"; // Replace with your log file path

List<String> errorLines = scanLogFile(logFilePath);

if (errorLines.isEmpty()) {

System.out.println("No errors found in the log file.");

} else {

System.out.println("Errors found in the log file:");

for (String error : errorLines) {

System.out.println(error);

}

}

}

}