Since the original project seems to be inactive and jcaptcha pops up occasionally as a component in larger frameworks, I have taken the latest trunk project state and made it ready for java 8. For now it maintains the original package names to be used as a direct replacement for jcaptcha-2.0-alpha1.
jcaptcha-2.0-alpha-2 contains a basic layout for the GlyphPaster, which was missing before, a number of additional bean configuration options, and updated support libraries.