The following code, JarFile.getManifest(), throw IOException: invalid header field 
when the manifest contains header name with 70 bytes. 

JAR Manifest specification state:"
 Because header names cannot be continued, the maximum length of a header name is 70 bytes (there must be a colon and a SPACE after the name)."
getManifest() should not throw IOException at 70 bytes header name (current, it handle up to 69 bytes.)

import java.io.*;
import java.util.*;
import java.util.jar.*;
    
public class ManifestTest {
  public static void main(String args[])
  {
    if (args.length != 1) {
      System.err.println("usage: manif file.jar");
      System.exit(1);
    }
    
    try {
      JarFile jf = new JarFile(args[0]);
      Manifest manif = jf.getManifest();
      /*
      if (manif != null) {
        manif.write(System.out);
        Attributes attr =
          manif.getMainAttributes();
        String attrname =
          "Specification-Version";
        String str =
          attr.getValue(attrname);
        System.out.println(str);
      }
      */
    }
    catch (IOException e) {
      System.err.println(e);
    }
  }
}