Detect corrupted jar files. Eclipse Maven plugin seems prone to creating these.

JarTest.java

import java.util.jar.JarFile;
import java.io.File;

/**
 * List corrupted Jar files.
 * <p>
 * Usage: java JarTest file ...
 * <p>
 * Prints the name and a message for each corrupted file.
 * <p>
 * At the end prints the number of good files scanned and the number of bad files found.
 */
public class JarTest {
	public static void main(String[] args) {
    	if(args.length < 1) {
        	System.err.println("need jar file");
			return;
		}
		int goodCount = 0;
		int badCount = 0;
		for (String pathname: args) {
			try (JarFile file = new JarFile(new File(pathname))) {
				file.getManifest();
				file.stream().map(e -> true);
				// System.out.println(pathname + " OK");
				goodCount++;
			} catch(Exception ex) {
				System.out.println(pathname + " " + ex.getMessage());
				badCount++;
				// ex.printStackTrace();
			}
		}
		
		System.out.printf("Good: %d\nBad: %d\n", goodCount, badCount);
	}
}

I run this as follows:

cd ~/.m2
# Copy JarTest.java here
javac JarTest.java
find . -name '*.jar' | xargs java JarTest

Typical output when there are no problems is below (with two runs because xargs decided to split the file list into two groups):

Good: 2646
Bad: 0
Good: 622
Bad: 0