ant javadoc results in build failed. A number of issues: 1) src directory uses old/pre-modular source layout 2) JDK asm sources directory uses old/pre-modular source layout 3) many ">" symbols in doc comment need to be replaced with HTML entities like > 4) unmatched paragraph <p> tags. 5) Developers need to run "ant javadoc" whenever they touch javadoc comments in any source file ;-)