Java VTD-XML找不到符号错误。编译Java时如何正确引用包？

我不是Java程序员，但是需要编写Java程序来解析较大的（400mb）xml文件。我选择了vtd-xml，但不知道如何正确引用该软件包。我不想使用maven / gradle，因为我不经常使用Java进行编程，而实际上只需要引用该软件包即可。我有：

import com.ximpleware.*;

在我的Java文件的顶部。我将vtd-xml源代码保存在与Java文件相同的目录中，因此目录结构如下所示：

my_java.java
vtd_xml/com
vtd_xml/example
vtd_xml/install.txt  
vtd_xml/Readme.txt   
vtd_xml/ximpleware_2.12-java-light.zip
vtd_xml/vtd-xml_light-2-12.jar

我导出了类路径，以便

echo $CLASSPATH

退货

vtd_xml/vtd-xml_light-2-12.jar

但是当我去编译我的java文件时，

javac my_java.java

我收到以下（令人沮丧的）错误：

zephyr_4.java:18: error: cannot find symbol
            XMLModifier xm = new XMLModifier(vn);
            ^
  symbol:   class XMLModifier
  location: class zephyr_4
zephyr_4.java:18: error: cannot find symbol
                XMLModifier xm = new XMLModifier(vn);
                                 ^
  symbol:   class XMLModifier
  location: class zephyr_4
zephyr_4.java:23: error: cannot find symbol
            ap.selectXPath(query);
              ^
  symbol:   method selectXPath(String)
  location: variable ap of type AutoPilot
zephyr_4.java:28: error: cannot find symbol
                while((i=ap.evalXPathToNumber())!=-1){
                       ^
  symbol:   method evalXPathToNumber()
  location: variable ap of type AutoPilot
zephyr_4.java:29: error: cannot find symbol
                    System.out.println(vn.toNormalizedPathString()); 
                                     ^
  symbol:   method toNormalizedPathString()
  location: variable vn of type VTDNav

我究竟做错了什么？如果有帮助，这是我的源代码：

import java.io.*; 
import com.ximpleware.*;
import java.util.*;

public class my_java {
      public static void main(String argv[]) throws NavException, IOException{
            // open a file and read the content into a byte array
            VTDGen vg = new VTDGen();
            if (vg.parseFile("pubmed_result.xml", true)){
                VTDNav vn = vg.getNav();
                AutoPilot ap = new AutoPilot(vn);
                XMLModifier xm = new XMLModifier(vn);
                String query = "count(//PubmedArticleSet/PubmedArticle"
                   + "/MedlineCitation/Article"
                   + "/AuthorList/Author[contains(LastName,\"Sangani\") and "
                   + "contains(ForeName, \"Rahul G\")])";
                ap.selectXPath(query);
                ap.bind(vn);


                int i = -1;
                while((i=ap.evalXPathToNumber())!=-1){
                    System.out.println(vn.toNormalizedPathString()); 
                }
            }
      }
}

更新我的符号错误仍然看起来像：

zephyr_4.java:8: error: cannot find symbol
import com.ximpleware.VTDGen;
                 ^
  symbol:   class VTDGen
  location: package com.ximpleware
zephyr_4.java:10: error: cannot find symbol
import com.ximpleware.AutoPilot;
                 ^
  symbol:   class AutoPilot
  location: package com.ximpleware
 zephyr_4.java:11: error: cannot find symbol
import com.ximpleware.XMLModifier;
                 ^
  symbol:   class XMLModifier
  location: package com.ximpleware
zephyr_4.java:16: error: cannot find symbol
      public static void main(String argv[]) throws NavException,      IOException{
                                                ^
  symbol:   class NavException
  location: class zephyr_4
zephyr_4.java:18: error: cannot find symbol
            VTDGen vg = new VTDGen();
            ^
  symbol:   class VTDGen
  location: class zephyr_4
zephyr_4.java:18: error: cannot find symbol
            VTDGen vg = new VTDGen();
                        ^
  symbol:   class VTDGen
  location: class zephyr_4
zephyr_4.java:21: error: cannot find symbol
                AutoPilot ap = new AutoPilot(vn);
                ^
  symbol:   class AutoPilot
  location: class zephyr_4
zephyr_4.java:21: error: cannot find symbol
                AutoPilot ap = new AutoPilot(vn);
                               ^
  symbol:   class AutoPilot
  location: class zephyr_4
zephyr_4.java:22: error: cannot find symbol
                XMLModifier xm = new XMLModifier(vn);
                ^
  symbol:   class XMLModifier
  location: class zephyr_4
zephyr_4.java:22: error: cannot find symbol
                XMLModifier xm = new XMLModifier(vn);
                                     ^
  symbol:   class XMLModifier
  location: class zephyr_4
10 errors