import java.io.*;

File jfxFolder = new File( basedir, "target/jfx" );
if( !jfxFolder.exists() ){
    throw new Exception( "there should be a jfx-folder!");
}

File jfxAppFolder = new File( jfxFolder, "app" );
if( !jfxAppFolder.exists() ){
    throw new Exception( "there should be a jfx-app-folder!");
}

File jfxNativeFolder = new File( jfxFolder, "native" );
if( !jfxNativeFolder.exists() ){
    throw new Exception( "there should be a jfx-native-folder!");
}