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java - Java 和 Xerces：找不到属性 XMLConstants.ACCESS_EXTERNAL_DTD

问题描述

我在这个博客上寻找了类似的帖子，但找不到我的问题的答案，所以我决定寻求帮助。

我用 Java 写了这个简单的函数：

 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);
        }

    }

我的目标是应用此处公开的 OWASP 标准，但出现以下错误：

 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]

我正在使用 Eclipse Oxygen、Tomcat 7 和 Java 1.8。谁能帮我？

谢谢你的支持。

标签： javaeclipsetomcatxerces

解决方案

javax.xml.XMLConstants.ACCESS_EXTERNAL_DTD在JAXP 1.5中定义，但 Xerces 不支持它。如果您无法删除 Xerces 依赖项，则应在 Xerces 之前将另一个实现添加到您的类路径。

或者，由于 JDK 包含 Xerces 的实现，您可以配置 DocumentBuilderFactory为使用System.properties.

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

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