Calling Java from NodeJS outputs file in root

Question

For a project structure like this:

/myfolder/app/components/owl2vowl.jar
/myfolder/app/uploads/ontology.owl
/myfolder/app.js

I am using OWL2VOWL to convert an ontology into a JSON

I wrote code in app.js to run the jar file with some parameters, which will run the command like this:

java -jar e:\myfolder\app\components\owl2vowl.jar -file e:\myfolder\app\uploads\ontology.owl

Here is the code:

var exec = require('child_process').exec, child;
child = exec('java -jar ' +  __dirname + '/components/owl2vowl.jar' + ' -file ' + syncPath ,
function (error, stdout, stderr){
  if(error !== null)
    console.log('There was an error parsing the ontology' + error);
  else           
    console.log('Succes parsing the ontology');

where

syncPath = e:\myfolder\app\uploads\ontology.owl

The problem is that the result is generated in folder myfolder generating the file ontology.json

How can I change the path where the result of the Java file is generated? Ideally into \app\uploads ?

/myfolder/app/components/owl2vowl.jar
/myfolder/app/uploads/ontology.owl
/myfolder/app.js
/myfolder/ontology.json

Edit - Added solution

the solution a suggested by javabeangrinder is to add a cwd option (in the following, the result will be outputted in the folder /components )

var options = { encoding: 'utf8',
                              timeout: 0,
                              maxBuffer: 200*1024,
                              killSignal: 'SIGTERM',
                              cwd:  __dirname + '/components/',
                              env: null }

child = exec('java -jar ' +  __dirname + '/components/owl2vowl.jar' + ' -iri ' + '"'+body.url+'"'+'  -echo' , options,
                              function (error, stdout, stderr){})

Why not move the file with NodeJS fs.rename(oldPath, newPath), after it is generated? — Alin Pandichi
– Alin Pandichi, Commented Aug 25, 2015 at 8:08
Already doing it - //move file from root to /cached/ fs.rename(getFileName.split(".")[0]+".json", __dirname + '/cached/' + getFileName.split(".")[0]+".json"); but the JAR can generate different file names (depending on the point in time when Java is called). — julia
– julia, Commented Aug 25, 2015 at 13:01
Your other option is to fork the OWL2VOWL project, add another commandline argument such as outputPath and implement the functionality. It shouldn't be a big deal, something like exportFile = new File(outputPath, filename) in github.com/VisualDataWeb/OWL2VOWL/blob/master/src/main/java/de/… — Alin Pandichi
– Alin Pandichi, Commented Aug 25, 2015 at 13:18

javabeangrinder · Accepted Answer · 2015-08-26 06:33:19Z

1

The problem is not the java code although it could be fixed changing it to accept an output folder as suggested earlier.

I believe that adding the node.js exec option cwd to the directory where you would like the output would do the trick.

Look further here: child_process.exec(command[, options], callback)

answered Aug 26, 2015 at 6:33

javabeangrinder

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