ClassNotFoundException:使用boilerPipe时的org.apache.xerces.parsers.AbstractSAXParser

Question

我是boilerpipe的新手，我正在尝试以下基本代码：

package contentExtraction;

import java.net.URL;

import de.l3s.boilerpipe.extractors.ArticleExtractor;

public class ContentExtractor {

    public static void main(String[] args) throws Exception {
        final URL url = new URL(
//              "http://www.l3s.de/web/page11g.do?sp=page11g&link=ln104g&stu1g.LanguageISOCtxParam=en"
            "http://www.dn.se/nyheter/vetenskap/annu-godare-choklad-med-hjalp-av-dna-teknik"
            );

       System.out.println(ArticleExtractor.INSTANCE.getText(url));
    }

}

但在尝试运行上面的代码时，我得到了以下错误：

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/xerces/parsers/AbstractSAXParser
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.access$100(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at de.l3s.boilerpipe.sax.BoilerpipeSAXInput.getTextDocument(BoilerpipeSAXInput.java:51)
    at de.l3s.boilerpipe.extractors.ExtractorBase.getText(ExtractorBase.java:69)
    at de.l3s.boilerpipe.extractors.ExtractorBase.getText(ExtractorBase.java:87)
    at contentExtraction.ContentExtractor.main(ContentExtractor.java:16)
Caused by: java.lang.ClassNotFoundException: org.apache.xerces.parsers.AbstractSAXParser
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 16 more

我在谷歌上搜索了这个错误，发现了this link。我以为我的依赖中缺少了xercesImpl.jar。我包含了相同的错误，但我的代码仍然给出了相同的错误。问题出在哪里？

Answer 1

我自己想出了解决方案。boilerpipe jar还有更多的依赖项。我将我的项目转换为maven项目，包括依赖项：

<dependency>
    <groupId>com.syncthemall</groupId>
    <artifactId>boilerpipe</artifactId>
    <version>1.2.1</version>
</dependency>

当我构建上述项目时，我可以看到在Maven Dependencies文件夹中实际导入了4个jars：

boilerpipe-1.2.1.jar

nekohtml-1.9.18.jar

xercesImpl-2.11.0.jar

xml-apis-1.4.01.jar