编译WorldWindJavav2.1.0中的ApplicationTemplate.java文件时有时报出“Exception in thread "main" java.lang.AbstractMethodError: javax.xml.parsers.DocumentBuilderFactory.setFeature(Ljava/lang/String;Z)V”错误的解决办法

1 问题

编译WorldWindJavav2.1.0中的ApplicationTemplate.java文件时有时报出如下错误：

Exception in thread "main" java.lang.AbstractMethodError: javax.xml.parsers.DocumentBuilderFactory.setFeature(Ljava/lang/String;Z)V

at gov.nasa.worldwind.util.WWXML.createDocumentBuilder(WWXML.java:61)
at gov.nasa.worldwind.util.WWXML.openDocumentStream(WWXML.java:236)
at gov.nasa.worldwind.util.WWXML.openDocumentStream(WWXML.java:223)
at gov.nasa.worldwind.util.WWXML.openDocumentFile(WWXML.java:175)
at gov.nasa.worldwind.util.WWXML.openDocument(WWXML.java:148)
at gov.nasa.worldwind.Configuration.loadConfigDoc(Configuration.java:131)
at gov.nasa.worldwind.Configuration.<init>(Configuration.java:108)
at gov.nasa.worldwind.Configuration.<clinit>(Configuration.java:76)
at gov.nasa.worldwind.awt.WorldWindowGLCanvas.<init>(WorldWindowGLCanvas.java:64)
at gov.nasa.worldwindx.examples.ApplicationTemplate$AppPanel.createWorldWindow(ApplicationTemplate.java:88)
at gov.nasa.worldwindx.examples.ApplicationTemplate$AppPanel.<init>(ApplicationTemplate.java:51)
at gov.nasa.worldwindx.examples.ApplicationTemplate$AppFrame.createAppPanel(ApplicationTemplate.java:399)
at gov.nasa.worldwindx.examples.ApplicationTemplate$AppFrame.initialize(ApplicationTemplate.java:336)
at gov.nasa.worldwindx.examples.ApplicationTemplate$AppFrame.<init>(ApplicationTemplate.java:319)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at gov.nasa.worldwindx.examples.ApplicationTemplate.start(ApplicationTemplate.java:538)
at gov.nasa.worldwindx.examples.ApplicationTemplate.main(ApplicationTemplate.java:563)

2 原因

不同jar包的多xml解析器冲突！！！

3 解决

解决方法：在使用DocumentBuilderFactory前加入这一行代码：

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

完整代码如下：

public static DocumentBuilder createDocumentBuilder(boolean isNamespaceAware)
    {
        System.setProperty("javax.xml.parsers.DocumentBuilderFactory", "com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl");//这一行是新增加的代码
        DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();

        docBuilderFactory.setNamespaceAware(isNamespaceAware);

        if (Configuration.getJavaVersion() >= 1.6)
        {
            try
            {
                docBuilderFactory.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd",
                    false);
            }
            catch (ParserConfigurationException e)
            {   // Note it and continue on. Some Java5 parsers don't support the feature.
                String message = Logging.getMessage("XML.NonvalidatingNotSupported");
                Logging.logger().finest(message);
            }
        }

        try
        {
            return docBuilderFactory.newDocumentBuilder();
        }
        catch (ParserConfigurationException e)
        {
            String message = Logging.getMessage("XML.ParserConfigurationException");
            Logging.logger().finest(message);
            throw new WWRuntimeException(e);
        }
    }

参考链接：解决javax.xml.parsers.DocumentBuilderFactory.setFeature(Ljava/lang/String;Z)V异常