File Encoding Problem

[rso1]

Your API uses the standard encoding of the VM, which is problematic in case
the encoding is set to something not graphviz compatible (e.g. Windows
encoding together with Protege). I would therefore recommend setting the
coding explicitly in the function "private File writeDotSourceToFile(String
str)" via Writer fout = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(temp), "UTF-8"))