saxon-he报错

1.最近在做java爬虫，使用的是webmagic框架，为了使用xpath2.0的语法引入了webmagic-saxon的依赖，导致出现报错：

java.lang.RuntimeException: XPathFactory#newInstance() failed to.....Illegal config

2.找到报错的代码是webmagic-saxon引入的saxon-he中的配置文件报错

<dependency>
	<groupId>net.sf.saxon</groupId>
	<artifactId>Saxon-HE</artifactId>
	<version>9.5.1-1</version>
	</dependency>

3.原因：

google了很长时间终于找到答案

由于这个版本的saxon-he （9.5.1）中配置文件的格式不被jdk8接收。

JDK 6和JDK 7接受了非法复合格式；;JDK 8不再接受这种格式。

而我使用的正式jdk1.8

4.解决方案

使用saxon-he的最新版本

就我使用webmagic-saxon而言，首先在webmagic-saxon中去除Saxon-HE，然后再添加Saxon-HE最新版本的依赖

<!-- 支持xpath2.0语法 -->
<dependency>
 <groupId>us.codecraft</groupId>
 <artifactId>webmagic-saxon</artifactId>
 <version>0.6.1</version>
 <exclusions>
  <exclusion>
   <groupId>net.sf.saxon</groupId>
   <artifactId>Saxon-HE</artifactId>
  </exclusion>
 </exclusions>

</dependency>

<!-- https://mvnrepository.com/artifact/net.sf.saxon/Saxon-HE -->
<dependency>
 <groupId>net.sf.saxon</groupId>
 <artifactId>Saxon-HE</artifactId>
 <version>9.7.0-15</version>
</dependency>

这个网站可以搜dependency： http://mvnrepository.com/artifact/org.apache.httpcomponents

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