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In Stable30 has fastjavac in path variable "fastjavacBinary" but there isn't this variable in Boston. After import project from Stable30 to Boston is fastjavac unusable.
Will be corrected in Release31 and main trunk. Boston is codefreezed, so here's a workaround: After you import Stable-3.0 project, - open Project | Settings | Compiler types - delete FastJavac compilation (if it is present) - right click on Compiler Types node and select New | Fastjavac compilation service
*** This bug has been marked as a duplicate of 8615 ***
It is old duplicate issue. I'm closing it.