This class handles looking up service providers on the class path.
It implements the system described in:
JAR
File Specification Under Service Provider. Note that this
interface is very similar to the one they describe which seems to
be missing in the JDK.
Returns an iterator where each element should implement the
interface (or subclass the baseclass) described by cls. The
Classes are found by searching the classpath for service files
named: 'META-INF/services/<fully qualified classname> that list
fully qualifted classnames of classes that implement the
service files classes interface. These classes must have
default constructors.
Parameters:
cls - The class/interface to search for providers of.