CorruptedJarsDetector

Detect/Delete/Repair Corrupted Maven/Gradle Jars on the Fly .

This project came out of pure frustration of manually finding and deleting corrupted jars on Java Projects

This is more advanced

https://github.com/javagl/DependencyCleaner

TODO

1. Repair on the fly

2. Detect on the fly

3. Maybe i will make it a standalone JavaFX application ... for now the below works :)

Some code for now

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import java.util.jar.JarFile;
import java.util.stream.Collectors;

public class JarValidator {

	public static void main(String[] args) throws IOException {
		Path repositoryPath = Paths.get("C:\\Users\\goxr3plus\\.m2");

		// Check if the main Repository Exists
		if (Files.exists(repositoryPath)) {

			// Create a class instance
			JarValidator jv = new JarValidator();

			List<String> jarReport = new ArrayList<>();
			jarReport.add("Repository to process: " + repositoryPath.toString());

			// Get all the directory files
			List<Path> jarFiles = jv.getFiles(repositoryPath, ".jar");
			jarReport.add("Number of jars to process: " + jarFiles.size());
			jarReport.addAll(jv.openJars(jarFiles, true));

			// Print the report
			jarReport.stream().forEach(System.out::println);

		} else {
			System.out.println("Repository path " + repositoryPath + " does not exist.");
		}
	}

	/**
	 * Get all the files from the given directory matching the specified extension
	 * 
	 * @param filePath      Absolute File Path
	 * @param fileExtension File extension
	 * @return A list of all the files contained in the directory
	 * @throws IOException
	 */
	private List<Path> getFiles(Path filePath, String fileExtension) throws IOException {
		return Files.walk(filePath).filter(p -> p.toString().endsWith(fileExtension)).collect(Collectors.toList());
	}

	/**
	 * Try to open all the jar files
	 * 
	 * @param jarFiles
	 * @return A List of Messages for Corrupted Jars
	 */
	private List<String> openJars(List<Path> jarFiles, boolean showOkayJars) {
		int[] badJars = { 0 };
		List<String> messages = new ArrayList<>();

		// For Each Jar
		jarFiles.forEach(path -> {

			try (JarFile file = new JarFile(path.toFile())) {
				if (showOkayJars)
					messages.add("OK : " + path.toString());
			} catch (IOException ex) {
				messages.add(path.toAbsolutePath() + " threw exception: " + ex.toString());
				badJars[0]++;
			}
		});

		messages.add("Total bad jars = " + badJars[0]);
		return messages;
	}

}

Output

run:
Repository to process: C:\Users\goxr3plus\.m2
Number of jars to process: 4920
C:\Users\goxr3plus\.m2\repository\bouncycastle\isoparser-1.1.18.jar threw exception: java.util.zip.ZipException: zip END header not found
Total bad jars = 1
BUILD SUCCESSFUL (total time: 2 seconds)