原文地址:
http://ephon.spaces.live.com/blog/cns!796FAD06E2C0A525!589.entry
JAXP DocumentBuilderFactory 以及 SAXParserFactory 具体实现的查找步骤
1、使用"javax.xml.parsers.DocumentBuilderFactory"系统属性。 即使用Java -Djavax.xml.parsers.DocumentBuilderFactory=.. ..定义的系统属性，可以通过System.getProperty("javax.xml.parsers.DocumentBuilderFactory")获得;
2、使用"jre\lib"下面的jaxp.properties 文件中键值为 javax.xml.parsers.DocumentBuilderFactory属性获得；
3、使用运行时类路径中JAR包中的"META-INF/services/javax.xml.parsers.DocumentBuilderFactory"文件中的第一行的内容作为具体的Factor实现；
同样了，对于寻找javax.xml.parsers.SAXParserFactory的过程与上述相同，只不过，属性名称为"javax.xml.parsers.SAXParserFactory"。
对于sun的jre来说，如果上述的三个地方均找不到，那么：
对于javax.xml.parsers.DocumentBuilderFactory: sun提供默认实现：com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl 对于javax.xml.parsers.SAXParserFactory: sun提供默认实现：com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl
另外，Trouble-shooting的好工具：
请设置属性 -Djaxp.debug=1，系统会把寻找javax.xml.parsers.DocumentBuilderFactory和javax.xml.parsers.SAXParserFactory 的具体过程给打印出来。就像下面:
JAXP: created new instance of class com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl using ClassLoader: sun.misc.Launcher$AppClassLoader@7259da
JAXP: find factoryId =javax.xml.parsers.DocumentBuilderFactory
JAXP: loaded from fallback value: com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl
.........
JAXP: find factoryId =javax.xml.parsers.DocumentBuilderFactory
JAXP: found jar resource=META-INF/services/javax.xml.parsers.DocumentBuilderFactory using ClassLoader: nc.bs.mw.start.BootstrapClassLoader@e5b723
JAXP: found in resource, value=org.apache.xerces.jaxp.DocumentBuilderFactoryImpl
JAXP: created new instance of class org.apache.xerces.jaxp.DocumentBuilderFactoryImpl using ClassLoader: nc.bs.mw.start.BootstrapClassLoader@e5b723
JAXP: find factoryId =javax.xml.parsers.DocumentBuilderFactory
JAXP: found jar resource=META-INF/services/javax.xml.parsers.DocumentBuilderFactory using ClassLoader: nc.bs.mw.start.BootstrapClassLoader@e5b723
.........
JAXP: find factoryId =javax.xml.parsers.DocumentBuilderFactory
JAXP: found jar resource=META-INF/services/javax.xml.parsers.DocumentBuilderFactory using ClassLoader: WebappClassLoader
delegate: false
repositories:
/WEB-INF/classes/
----------> Parent Classloader:
nc.bs.mw.start.BootstrapClassLoader@e5b723
.........
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