XPathFactoryImpl 未找到错误（使用 myBatis）答案

【问题标题】：XPathFactoryImpl not found error (using myBatis)XPathFactoryImpl 未找到错误（使用 myBatis）
【发布时间】：2017-04-18 17:02:03
【问题描述】：

使用 myBatis StandAlone（Atlassian jira 插件（OSGi）环境）

出现以下错误。

[INFO] [talledLocalContainer] org.apache.ibatis.exceptions.PersistenceException:
[INFO] [talledLocalContainer]     ### Error building SqlSession.
[INFO] [talledLocalContainer]     ### Cause: java.lang.RuntimeException: XPathFactory#newInstance() failed to create an XPathFactory for the default o
bject model: http://java.sun.com/jaxp/xpath/dom with the XPathFactoryConfigurationException: javax.xml.xpath.XPathFactoryConfigurationException: java.
util.ServiceConfigurationError: javax.xml.xpath.XPathFactory: Provider org.apache.xpath.jaxp.XPathFactoryImpl not found
[INFO] [talledLocalContainer] ### Cause: java.lang.RuntimeException: XPathFactory#newInstance() failed to create an XPathFactory for the default object model: http://java.sun.com/jaxp/xpath/dom with the XPathFactoryConfigurationException:javax.xml.xpath.XPathFactoryConfigurationException: java.util.ServiceConfigurationError: javax.xml.xpath.XPathFactory: Provider org.apache.xpath.jaxp.XPathFactoryImpl not found

源代码

static {
    try {
        // set SessionFactory
        if (MyBatisConnectionFactory.sqlSessionFactory == null) {
            MyBatisConnectionFactory.sqlSessionFactory = new SqlSessionFactoryBuilder().build(Resources.getResourceAsStream("/mybatisConfig.xml"));
        }

    } catch (final Exception e) {
        MyBatisConnectionFactory.LOGGER.error(e.getMessage());
    } finally {
    }
}

添加xalan时出现如下错误。

Caused by: java.lang.ClassCastException: org.apache.xerces.jaxp.DocumentBuilderFactoryImpl cannot be cast to javax.xml.parsers.DocumentBuilderFactory

Pure Java Application 环境中不会出现此错误。

不知道为什么会出现这个错误。

请帮帮我。

谢谢。

【问题讨论】：

代码正在使用服务定位器来查找要使用的实现。显然那个 jar 不在类路径中

标签： java osgi mybatis jira-plugin

【解决方案1】：

我遇到了类似的错误，这个看起来很尴尬的东西，documented here，为我修复了它：

-Djavax.xml.xpath.XPathFactory:http://java.sun.com/jaxp/xpath/dom=com.sun.org.apache.xpath.internal.jaxp.XPathFactoryImpl

我在 macos 上使用这个 java 版本：

java version "1.8.0_92"
Java(TM) SE Runtime Environment (build 1.8.0_92-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.92-b14, mixed mode)

来自 -Djaxp.debug=1 的标准错误帮助我找到了这个：

JAXP: Looking up system property 'javax.xml.xpath.XPathFactory:http://java.sun.com/jaxp/xpath/dom'
JAXP: The property is undefined.

所以我完全按照它的要求给了它，它变得很开心等等：

JAXP: Looking up system property 'javax.xml.xpath.XPathFactory:http://java.sun.com/jaxp/xpath/dom'
JAXP: The value is 'com.sun.org.apache.xpath.internal.jaxp.XPathFactoryImpl'
JAXP: createInstance(com.sun.org.apache.xpath.internal.jaxp.XPathFactoryImpl)
JAXP: loaded com.sun.org.apache.xpath.internal.jaxp.XPathFactoryImpl from jar:file:/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Hom     e/jre/lib/rt.jar!/com/sun/org/apache/xpath/internal/jaxp/XPathFactoryImpl.class
JAXP: factory 'com.sun.org.apache.xpath.internal.jaxp.XPathFactoryImpl' was found for http://java.sun.com/jaxp/xpath/dom

我对 :uri 语法很好奇，因为没有 :uri 的情况下以下工作正常。那么为什么 XPath 需要这个而其他的不需要呢？

-Dcom.sun.org.apache.xml.internal.dtm.DTMManager=com.sun.org.apache.xml.internal.dtm.ref.DTMManagerDefault
-Djavax.xml.parsers.DocumentBuilderFactory=com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl

【讨论】：

感谢分享这个@erik-ostermueller。这对我有用！耶！