There's a bug in function sysAvailable() in file
src/win32/java/runtime/io_md.c, in JDK 1.1.6M.

Note in the following listing of function sysAvailable() that no value
is returned if the call to fstat() fails. This causes JCK test
FISAvailableTest2 in JCK-116ea to fail on win32 systems.

int
sysAvailable(int fd, long *pbytes)
{
    long cur, end;
    struct stat stbuf;

    if (fstat(fd, &stbuf) >= 0) {
        int mode = stbuf.st_mode;
        if (S_ISCHR(mode) || S_ISFIFO(mode)) {
            return (fd == 0) ? stdinAvailable(fd, pbytes) :
                nonSeekAvailable(fd, pbytes);
        }
        if ((cur = lseek(fd, 0L, SEEK_CUR)) == -1) {
            return FALSE;
        } else if ((end = lseek(fd, 0L, SEEK_END)) == -1) {
            return FALSE;
        } else if (lseek(fd, cur, SEEK_SET) == -1) {
            return FALSE;
        }
        *pbytes = end - cur;
        return TRUE;
    }
}