text: 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!");
  }