wro4j-core/src/main/java/ro/isdc/wro/model/resource/locator/wildcard/JarWildcardStreamLocator.java
JarFile open(final File jarFile) throws IOException {
    isTrue(jarFile.exists(), "The JAR file must exists.");
    return new JarFile(jarFile);
  }
JarFile open(final File jarFile) throws IOException {
    isTrue(jarFile.exists(), "The JAR file must exists.");
    return new JarFile(jarFile);
  }
Opens the specified JAR file and returns a valid handle.

@param jarFile
Location of the valid JAR file to read. It cannot be null.
@return A valid {@link JarFile} to read resources.
@throws IllegalArgumentException
If the file cannot be opened because an {@link IOException}.
@VisibleForTestOnly