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xml-jaxp: Upload and Parse an XML File Using DOM or SAX

Author: Bartosz Baranowski
Level: Intermediate
Technologies: JAXP, SAX, DOM, Servlet
Summary: The xml-jaxp quickstart demonstrates how to use Servlet and JSF to upload an XML file to JBoss EAP and validate and parse it using DOM or SAX.
Target Product: JBoss EAP
Source: https://github.com/jboss-developer/jboss-eap-quickstarts/

What is it?

The xml-jaxp quickstart is a simple Java EE JAXP example that demonstrates how to use Servlet 3.0 and JSF to upload an XML file to Red Hat JBoss Enterprise Application Platform and parse it using DOM or SAX, both of which are built into Java. It also shows how to use modules available in JBoss EAP.

This quickstart provides an example XML schema and document file to use when testing this quickstart.

  • The XML schema is located here: QUICKSTART_HOME/src/main/resources/catalog.xsd
  • The XML document is located here: QUICKSTART_HOME/src/main/resources/catalog.xml

System Requirements

The application this project produces is designed to be run on Red Hat JBoss Enterprise Application Platform 7.1 or later.

All you need to build this project is Java 8.0 (Java SDK 1.8) or later and Maven 3.3.1 or later. See Configure Maven for JBoss EAP 7.1 to make sure you are configured correctly for testing the quickstarts.

Use of EAP7_HOME

In the following instructions, replace EAP7_HOME with the actual path to your JBoss EAP installation. The installation path is described in detail here: Use of EAP7_HOME and JBOSS_HOME Variables.

Start the Server

  1. Open a command prompt and navigate to the root of the JBoss EAP directory.

  2. The following shows the command line to start the server:

     For Linux:   EAP7_HOME/bin/standalone.sh
 For Windows: EAP7_HOME\bin\standalone.bat

Build and Deploy the Quickstart

  1. Make sure you have started the JBoss EAP server as described above.

  2. Open a command prompt and navigate to the root directory of this quickstart.

  3. Type this command to build and deploy the archive:

     mvn clean install wildfly:deploy

  4. This will deploy target/xml-jaxp.war to the running instance of the server.

Access the Application

The application will be running at the following URL: http://localhost:8080/xml-jaxp/.

To test the quickstart, follow these steps.

  1. Click the Browse button and navigate to the QUICKSTART_HOME/src/main/resources/catalog.xml file.

  2. Click the Upload button. The XML file content is parsed and displayed on the page.

  3. You should see the following output in the server console that shows the DOMXMLParser was used:

     INFO  [stdout] (http-/127.0.0.1:8080-1) Parsing the document using the DOMXMLParser!

To enable the alternative SAXXMLParser parser:

  1. Remove the comments that surround the alternate parser element in the WEB-INF/beans.xml file.

  2. Redeploy the application using the instructions above and access the application in a browser at the following URL: http://localhost:8080/xml-jaxp/.

  3. Click the Browse button and navigate to the QUICKSTART_HOME/src/main/resources/catalog.xml file.

  4. Click the Upload button. The XML file content is parsed and displayed on the page.

  5. You should now see following output in the server console:

     INFO  [stdout] (http-/127.0.0.1:8080-1) Parsing the document using the SAXXMLParser!

Undeploy the Archive

  1. Make sure you have started the JBoss EAP server as described above.

  2. Open a command prompt and navigate to the root directory of this quickstart.

  3. When you are finished testing, type this command to undeploy the archive:

     mvn wildfly:undeploy

Run the Quickstart in Red Hat JBoss Developer Studio or Eclipse

You can also start the server and deploy the quickstarts or run the Arquillian tests from Eclipse using JBoss tools. For general information about how to import a quickstart, add a JBoss EAP server, and build and deploy a quickstart, see Use JBoss Developer Studio or Eclipse to Run the Quickstarts.

Debug the Application

If you want to debug the source code of any library in the project, run the following command to pull the source into your local repository. The IDE should then detect it.

    mvn dependency:sources