Arabic text not displaying properly

I am using XSL-Fo template for generating PDF using java api (like below).

Arabic text not displaying properly like "??? ???????? ???????"

Java code

    FOProcessor processor = new FOProcessor();

    processor.setData("d:\\105603006926_B1-49053855.xml");     // set XML input file

    processor.setTemplate("d:\\UsageSummary.fo"); // set XSL input file

    processor.setOutput("d:\\UsageSummary.pdf");  //set output file

    processor.setOutputFormat(FOProcessor.FORMAT_PDF);

    processor.generate();

XSL

<fo:inline font-family="Arial" font-size="10pt" font-weight="bold"  color="#58595b;">المبالغ المستحقة على </fo:inline>