Java and Xerces: can't find property XMLConstants.ACCESS_EXTERNAL_DTD

Question

I looked for similar posts on this blog, but couldn't find an answer to my question, so I decided to ask for help.

I wrote this simple function in Java:

 public void open(InputStream stream) throws FoliumFatalException {
        try {
            InputSource is = new InputSource(stream);
            DocumentBuilderFactory dfact = DocumentBuilderFactory.newInstance();

//            /* OWASP: inhibit access to External Entities */
            dfact.setAttribute(XMLConstants.ACCESS_EXTERNAL_DTD, ""); 
            dfact.setAttribute(XMLConstants.ACCESS_EXTERNAL_SCHEMA, ""); 

            _doc = dfact.newDocumentBuilder().parse(is);

        } catch (Throwable t) {
            _logger.error(t, t);
            throw new FoliumFatalException("ENG-0017", "Errore di parsing su stream", t);
        }

    }

My goal is applying OWASP standards as exposed here, but I get the following error:

 java.lang.IllegalArgumentException: Property 'http://javax.xml.XMLConstants/property/accessExternalDTD' is not recognized.
java.lang.IllegalArgumentException: Property 'http://javax.xml.XMLConstants/property/accessExternalDTD' is not recognized.
    at org.apache.xerces.jaxp.DocumentBuilderFactoryImpl.setAttribute(Unknown Source) ~[xercesImpl-2.8.0.jar:?]
    at agora.folium.engine.impl.j2ee.FoliumJ2eeXmlParserImpl.open(FoliumJ2eeXmlParserImpl.java:108) [classes/:?]
    at agora.folium.engine.impl.FoliumAbstractEngine.loadServices(FoliumAbstractEngine.java:268) [classes/:?]
    at agora.folium.engine.impl.j2ee.FoliumJ2eeEngineImpl.startup(FoliumJ2eeEngineImpl.java:110) [classes/:?]
    at agora.folium.engine.Folium.startup(Folium.java:258) [classes/:?]
    at agora.folium.control.impl.j2ee.FoliumActionServlet.init(FoliumActionServlet.java:94) [classes/:?]
    at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1230) [catalina.jar:7.0.85]
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1174) [catalina.jar:7.0.85]
    at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1066) [catalina.jar:7.0.85]
    at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5370) [catalina.jar:7.0.85]
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5668) [catalina.jar:7.0.85]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145) [catalina.jar:7.0.85]
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:1015) [catalina.jar:7.0.85]
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:991) [catalina.jar:7.0.85]
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652) [catalina.jar:7.0.85]
    at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:712) [catalina.jar:7.0.85]
    at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:2002) [catalina.jar:7.0.85]
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_141]
    at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_141]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.8.0_141]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.8.0_141]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_141]

I'm using Eclipse Oxygen, Tomcat 7 and Java 1.8. Can anyone help me?

Thanks for your support.

Answer 1

javax.xml.XMLConstants.ACCESS_EXTERNAL_DTD is defined in JAXP 1.5, but Xerces does not support it. If you can't remove Xerces dependency, you should add another implementation to your classpath before Xerces.

Alternatively, since JDK contains an implementation of Xerces you can configure DocumentBuilderFactory to return the JDK version using System.properties.

System.setProperty("javax.xml.parsers.DocumentBuilderFactory",
        "com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl");