Thank you very much for the hints. So far I can't overcome some settings issue. I've installed SDK for Symbian Belle and when I try to build midlet, I get
java.io.IOException: Cannot run program "C:\Nokia\devices\Nokia_Symbian_Belle_SDK_v0.6\lib\bin\preverify": CreateProcess error=2, Could not locate specified file at java.lang.ProcessBuilder.start ProcessBuilder.java:1029).The path to preverify executable is set correct, but when I created new folder 'bin' in 'lib' copied preverify here, I got
C:\Users\...\Documents\NetBeansProjects\SensorTestMIDlet\nbproject\build-impl.xml:483: Preverification failed with error code -1.