How to validate XML using .xsd file

This construction was used in one unit-test. I had to check whether the XML string returned by tested function is in accordance with xsd scheme defined, the routine below:

try
      {
         String actualResult = testedFunction();
         InputStream inputStream = new ByteArrayInputStream(actualResult.getBytes());
         StreamSource ss = new StreamSource(inputStream);
         // get validation driver:
         SchemaFactory factory = SchemaFactory.newInstance(schemaLang);
         // create schema by reading it from an XSD file:
         Schema schema = factory.newSchema(new StreamSource("xsd_file_path"));
         Validator validator = schema.newValidator();
         // at last perform validation:
         validator.validate(ss);
      }
      catch(SAXException ex) {
         // we are here if the document is not valid:
         // ... process validation error...
         fail("Output result is not valid");
         ex.printStackTrace();
      }
      catch(Exception e) {
         // Mustn't reach this code
         fail();
      }