With nashorn "ant javadoc" target, we build javadoc for nashorn. Although nashorn classes are not part of published libraries, nashorn team uses javadoc more like developer docs. Because nashorn uses ASM classes, we build docs for asm classes as well. As of now, nashorn javadoc target failes with errors - because of doc comment issues in jdk.internal.asm.*. It is better to fix javadoc comments in ASM sources to avoid javadoc errors atleast.