How to use

replaceSystemProps

method

in

org.apache.activemq.artemis.utils.XMLUtil

public void parseConfiguration(final InputStream input) throws Exception {
 Reader reader = new InputStreamReader(input);
 String xml = XMLUtil.readerToString(reader);
 xml = XMLUtil.replaceSystemProps(xml);
 Element e = XMLUtil.stringToElement(xml);
 // only parse elements from <jms>
 NodeList children = e.getElementsByTagName(CONFIGURATION_SCHEMA_ROOT_ELEMENT);
 if (children.getLength() > 0) {
   parseConfiguration(children.item(0));
 }
}

public Configuration parseMainConfig(final InputStream input) throws Exception {
 Reader reader = new InputStreamReader(input);
 String xml = XMLUtil.readerToString(reader);
 xml = XMLUtil.replaceSystemProps(xml);
 Element e = XMLUtil.stringToElement(xml);
 SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
 Schema schema = schemaFactory.newSchema(XMLUtil.findResource("schema/artemis-server.xsd"));
 Validator validator = schema.newValidator();
 try {
   validator.validate(new DOMSource(e));
 } catch (Exception ex) {
   ActiveMQServerLogger.LOGGER.error(ex.getMessage());
 }
 Configuration config = new ConfigurationImpl();
 parseMainConfig(e, config);
 return config;
}

 @Override
 public void reload(URL url) throws Exception {
   ActiveMQServerLogger.LOGGER.reloadingConfiguration("jms");
   InputStream input = url.openStream();
   String xml;
   try (Reader reader = new InputStreamReader(input)) {
    xml = XMLUtil.readerToString(reader);
   }
   xml = XMLUtil.replaceSystemProps(xml);
   Element e = XMLUtil.stringToElement(xml);
   if (config instanceof FileJMSConfiguration) {
    NodeList children = e.getElementsByTagName("jms");
    //if the "jms" element exists then parse it
    if (children.getLength() > 0) {
      ((FileJMSConfiguration) config).parse((Element) children.item(0), url);
      JMSServerManagerImpl.this.deploy();
    }
   }
 }
}

public void readConfiguration() throws Exception {
 URL url;
 url = Thread.currentThread().getContextClassLoader().getResource(configurationUrl);
 if (url == null) {
   // trying a different classloader now
   url = getClass().getClassLoader().getResource(configurationUrl);
 }
 if (url == null) {
   // The URL is outside of the classloader. Trying a pure url now
   url = new URL(configurationUrl);
 }
 // create a reader
 try (Reader reader = new InputStreamReader(url.openStream())) {
   String xml = XMLUtil.readerToString(reader);
   //replace any system props
   xml = XMLUtil.replaceSystemProps(xml);
   Element e = XMLUtil.stringToElement(xml);
   //iterate around all the deployables
   for (Deployable deployable : deployables.values()) {
    String root = deployable.getRootElement();
    NodeList children = e.getElementsByTagName(root);
    //if the root element exists then parse it
    if (root != null && children.getLength() > 0) {
      Node item = children.item(0);
      XMLUtil.validate(item, deployable.getSchema());
      deployable.parse((Element) item, url);
    }
   }
 }
}

@Test
public void testReplaceSystemProperties() {
 String before = "<configuration>\n" + "   <test name=\"${sysprop1}\">content1</test>\n" + "   <test name=\"test2\">content2</test>\n" + "   <test name=\"test3\">content3</test>\n" + "   <test name=\"test4\">${sysprop2}</test>\n" + "   <test name=\"test5\">content5</test>\n" + "   <test name=\"test6\">content6</test>\n" + "</configuration>";
 String after = "<configuration>\n" + "   <test name=\"test1\">content1</test>\n" + "   <test name=\"test2\">content2</test>\n" + "   <test name=\"test3\">content3</test>\n" + "   <test name=\"test4\">content4</test>\n" + "   <test name=\"test5\">content5</test>\n" + "   <test name=\"test6\">content6</test>\n" + "</configuration>";
 System.setProperty("sysprop1", "test1");
 System.setProperty("sysprop2", "content4");
 String replaced = XMLUtil.replaceSystemProps(before);
 Assert.assertEquals(after, replaced);
}

reader = new InputStreamReader(url.openStream());
String xml = XMLUtil.readerToString(reader);
xml = XMLUtil.replaceSystemProps(xml);
Element e = XMLUtil.stringToElement(xml);

Reader reader = new InputStreamReader(url.openStream());
String xml = XMLUtil.readerToString(reader);
xml = XMLUtil.replaceSystemProps(xml);
configuration = (MessageServiceConfiguration) jaxb.createUnmarshaller().unmarshal(new StringReader(xml));

try (Reader reader = new InputStreamReader(url.openStream())) {
  String xml = XMLUtil.readerToString(reader);
  xml = XMLUtil.replaceSystemProps(xml);
  configuration = (MessageServiceConfiguration) jaxb.createUnmarshaller().unmarshal(new StringReader(xml));