Save ontology file OWL API -

i saving owl file shown in owl api example file.

file file = file.createtempfile("sample", "saving");             owlontologyformat format = manager.getontologyformat(ontology);      owlxmlontologyformat owlxmlformat = new owlxmlontologyformat(); if (format.isprefixowlontologyformat()) {    owlxmlformat.copyprefixesfrom(format.asprefixowlontologyformat()); } manager.saveontology(ontology, owlxmlformat, iri.create(file.touri())); 

i tried following code.

file file = new file("sample.owl");          owlontologyformat format = manager.getontologyformat(ontology);      owlxmlontologyformat owlxmlformat = new owlxmlontologyformat(); if (format.isprefixowlontologyformat()) {    owlxmlformat.copyprefixesfrom(format.asprefixowlontologyformat()); } manager.saveontology(ontology, owlxmlformat, iri.create(file.touri())); 

both methods failed save file. please help.

edit:

following codes creating ontology , manager

manager = owlmanager.createowlontologymanager(); reasonerfactory = (owlreasonerfactory) pelletreasonerfactory.getinstance(); datafactory = manager.getowldatafactory(); pm = new defaultprefixmanager(base_url); file file = new file(filename); owlontology ontology = null; try {     ontology = manager.loadontologyfromontologydocument(file); } catch (owlontologycreationexception e) {     system.out.println("fail load file. " + e); } 

for information, following code able save (modified) ontology original file.

manager.saveontology(ontology); 

thank you.

the following code should read existing ontology file (test.owl) , save in different format (test-format.owl). make sure original file exists , contains axioms (the getaxiomcount() method.

//create manager owlontologymanager manager = owlmanager.createowlontologymanager(); //file existing ontology - make sure it's there! file file = new file("/home/test.owl"); //load ontology file owlontology ontology = manager.loadontologyfromontologydocument(file); //check if ontology contains axioms      system.out.println("number of axioms: " + ontology.getaxiomcount());  //create file new format file fileformated = new file("/home/test-format.owl"); //save ontology in different format owlontologyformat format = manager.getontologyformat(ontology); owlxmlontologyformat owlxmlformat = new owlxmlontologyformat(); if (format.isprefixowlontologyformat()) {    owlxmlformat.copyprefixesfrom(format.asprefixowlontologyformat());  } manager.saveontology(ontology, owlxmlformat, iri.create(fileformated.touri()));