Let's see this are the options and meanings:
-s: Specifies where to generate the SOURCES
-d: Specifies where to generate the CLASSES
-keep: Says to KEEP the sources
-p: Specifies a package
Now, you were using a "." to specify the source output, that may generate the problem. If your output folder is the current one, specify nothing.
Read here for wsimport documentation and for other tutorial for its usage use this.