java - Apache FOP generating blank page -

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i trying generate pdf using apache fop , java. using valid xsl-fo file can create pdf using command line fop.

my problem occurs when try run fop using apache fop libraries. running across java/php bridge. bride configured , java / php communicate. on java side have function takes in string containing xsl-fo , returns string contains pdf. when execute function , redirect output stdout file, or across java / php bridge, pdf appears blank , size double of correct pdf retrieve via command line. assume having kind of encoding problem.

has seen issue before?

here java code

public string convertfotopdf(string fo) {      // contain results after transformation.     bytearrayoutputstream out = new bytearrayoutputstream();      // input string     stringreader sr = new stringreader(fo);      // should utf-8;     string strencoding = charset.defaultcharset().name();      // resulting string.     string pdfresult = "";      try     {         // instance of fop factory         fopfactory fopfactory = fopfactory.newinstance();         fouseragent fouseragent = fopfactory.newfouseragent();          // construct fop desired output format         fop fop = fopfactory.newfop(mimeconstants.mime_pdf, fouseragent, out);          // setup jaxp using identity transformer         transformerfactory factory = transformerfactory.newinstance();         transformer transformer = factory.newtransformer();           // setup input stream         source src = new streamsource(sr);          // resulting sax events (the generated fo) must piped through fop                     result res = new saxresult(fop.getdefaulthandler());                     // set encoding on transformer.                    transformer.setoutputproperty(outputkeys.encoding, strencoding);           // start xslt transformation , fop processing         transformer.transform(src, res);          // put byte array stream string         pdfresult = out.tostring(strencoding);     }      // catch exceptions simplicities sake.     catch (exception e){          // log             }      return pdfresult; }


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