Java support has been weak due to the Amiga 68K poor performance running java programs. There is a Java project in progress:
http://sourceforge.net/projects/jamiga/http://www.jamiga.org/As for Flash, only Voyager has Flash support. IBrowse hasn't had it due to its poor Plugin facilities and lack of SDK for developing for it. A common plugin API would help a lot of Amiga browsers to share plugins...
IBrowse should eventually have Flash support in next version:
http://www.ibrowse-dev.net/faq.phpAs for AWeb, there may be support for v4.