in src/main/java/org/apache/maven/shared/jarsigner/JarSignerUtil.java [191:200]
protected static boolean isManifestFile(String entryName) {
if (entryName.regionMatches(true, 0, "META-INF", 0, 8)) {
entryName = entryName.replace('\\', '/');
if (entryName.indexOf('/') == 8 && entryName.lastIndexOf('/') == 8) {
return endsWithIgnoreCase(entryName, "/MANIFEST.MF");
}
}
return false;
}