Register built-in SPIs.
registerServiceProvider(new JPEGImageWriterSpi());
registerServiceProvider(new JPEGImageReaderSpi());
registerServiceProvider(new PNGImageReaderSpi());
registerServiceProvider(new PNGImageWriterSpi());
registerServiceProvider(new FileIOSSpi());
registerServiceProvider(new FileIISSpi());
registerServiceProvider(new RAFIOSSpi());
registerServiceProvider(new RAFIISSpi());
registerServiceProvider(new OutputStreamIOSSpi());
registerServiceProvider(new InputStreamIISSpi());
// -- TODO implement