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The JAR file format was extended in JDK 1.3 to support a standard way of specifying pluggable "service providers" in a special META-INF file (see http://java.sun.com/j2se/1.4/docs/guide/jar/jar.html#Service%20Provider for details). Many subsystems in the platform now use this feature, including sound, security, networking, naming, new I/O, image I/O, printing, input methods, and XML. Most (though not all) of these subsystems use the internal sun.misc.Service class, which defines a simple mechanism for looking up services and instantiating providers. We should refine the sun.misc.Service class as needed and then promote it into the java.util package. This will make it easier for both internal and external developers to make use of the META-INF/services feature, which has become very widely used.
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