public ExternalProject(File file,String[] natureIds,String[] builderIds){
  this(file,Arrays.asList(natureIds),Arrays.asList(builderIds));
}

public ExternalProject ( File file , String [ ] natureIds , String [ ] builderIds ) { this ( file , Arrays . asList ( natureIds ) , Arrays . asList ( builderIds ) ) ; }
creates a new external project with the underlying wrapped file resource and the project nature and builder ids .
