Hi Spark Comunity,
In the case someone have had troubles to build the spark''s JavaDocs under Windows (like me), here is the solution:
I''ve extracted from the ant''s debug output the needed information about what sources should be processed and with which options, and created a javadocs argument file which can be used to build the JavaDocs for the Spark 2.5.1 source code release.
If anyone is interested I can mail her/him the batch file and the arguments file and also the whole JavaDocs package as RAR-archive.
Thanks for the attention.