Thank you, r.liechty
Yes, it was only 32bit jre in my PC. Because I could not install 64bit version somehow.
I just found the reason, I could not install 64bit java jre because of JAPANESE KANJI PROGRAM(FEP ATOK)
Now I have both 64bit jre and 64bit jdk then I could successfully build my projects
This is a suggestion to Japanese programmer who can’t install jre 64bit
if you run ATOK (KANJI Processor), you can not install jre 64bit.
Once you change to MS-IME then install jre 64bit version,
then back to ATOK if you need.
Thank you r.liechty again