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注明原文：https://blog.csdn.net/q258523454/article/details/145512328 

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dom4j报错

idea插件使用到了dom4j依赖，但是报错：

I will print the stack trace then carry on using the default SAX parser
Caught exception attempting to use SAX to load a SAX XMLReader 
java.lang.ClassCastException: class org.apache.xerces.parsers.SAXParser cannot be cast to class org.xml.sax.XMLReader (org.apache.xerces.parsers.SAXParser is in unnamed module of loader com.intellij.util.lang.PathClassLoader @5ba23b66; org.xml.sax.XMLReader is in unnamed module of loader com.intellij.ide.plugins.cl.PluginClassLoader @63326c11)

I will print the stack trace then carry on using the default SAX parser
Caught exception attempting to use SAX to load a SAX XMLReader 
java.lang.ClassCastException: class org.apache.xerces.parsers.SAXParser cannot be cast to class org.xml.sax.XMLReader (org.apache.xerces.parsers.SAXParser is in unnamed module of loader com.intellij.util.lang.PathClassLoader @5ba23b66; org.xml.sax.XMLReader is in unnamed module of loader com.intellij.ide.plugins.cl.PluginClassLoader @63326c11)

原因

这是因为依赖冲突了，IntelliJ IDEA 新版已经自带了 

<dependency>
    <groupId>xml-apis</groupId>
    <artifactId>xml-apis</artifactId>
    <version>xxx</version>
</dependency>

解决

我们只需要排除这个依赖即可

build.gradle 文件中添加（新版gradle）：

configurations.configureEach {exclude group: 'xml-apis', module: 'xml-apis'
}

或者（旧版本gradle）

configurations.all {exclude group: 'xml-apis', module: 'xml-apis'
}

重新运行即可！