I successfully builded the Antenna on amd64 using both sun-jdk and icedtea6. It builds my small J2ME project correctly. The only limitation is impossibility to launch the WTK emulator as simple as it is on x86. Though it is possible too: it's needed to install 32-bit JDK somewhere and point WTK to it in some manner. Reproducible: Always Steps to Reproduce:
~amd64 added.