Function is blocked for all JDKs 7 and 8 since NB 7.3. See issue 221893.
Once a JDK with patch for this problem is released, the function should be unblocked again starting it's version.
css2bin is working with recent JDK 8 builds (it might be unblocked for it in trunk), however the bug is still present in current and next JDK 7 updates, so there will be no change for NB 7.3.1
At last it became clear in which JDK version the css-to-bss convertor works; it works only in JDK7u14 and then in JDK7u40+ but in no other JDK7. It works in JDK8. We adjusted the buildscripts accordingly: in those JDKs where it does not work it is bypassed and a warning is issued, in those where it does work it is used.
fixed in jetmain
Integrated into 'main-golden', will be available in build *201305302301* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress)
User: Petr Somol <firstname.lastname@example.org>
Log: #226112 - Unblock Binary CSS Encoding in JavaFX Projects