java.lang.NoClassDefFoundError：org / apache / commons / lang3 / ObjectUtils [英] java.lang.NoClassDefFoundError: org/apache/commons/lang3/ObjectUtils

问题描述

我正在尝试编写程序来读取CSV文件，然后用它来制作一些东西。
我经常搜索，最后我发现了这个库。

I'm trying to code a program to read a CSV file and then make some stuff with it. I've searching a lot, and finally I found out this library.

前几天我完成了代码，一切正常。今天我将库更新到4.0 v，然后弹出了很多警告。

Some days ago I finished the code, and everything worked fine. Today I updated the library to the 4.0 v, and then a lot of warnings popped out.

我做了一些测试，失败的部分是：

I made some testing and the part that fails is:

public void LeerCSV(File CSVCat, File CSVProd){  
//Creo un objeto de la clase FileReader que me hace falta para los CSVReader
CSVReaderBuilder lectorCatBuilder = null;
CSVReaderBuilder lectorProdBuilder = null;

CSVReader CatReader = null;
CSVReader ProdReader = null;

CSVParser CatParser = null;
CSVParser ProdParser = null;
        //Vamos a intentar abrirlos y operar con ellos 

try {
    //Se crea una especie de "constructor" para crear los lectores de archivos.
    //para ello, antes se le pasan todos los atributos que queramos        

   CatParser =
   new CSVParserBuilder()
   .withSeparator(SEPARADOR)
   .withIgnoreQuotations(true)
   .build();
   CatReader =
   new CSVReaderBuilder(new FileReader(CSVCat))
   .withSkipLines(1)
   .withCSVParser(CatParser)
   .build();

   ProdParser =
   new CSVParserBuilder()
   .withSeparator(SEPARADOR)
   .withIgnoreQuotations(true)
   .build();
   ProdReader =
   new CSVReaderBuilder(new FileReader(CSVProd))
   .withSkipLines(1)
   .withCSVParser(ProdParser)
   .build();

这一个。

警告是：

Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: 
org/apache/commons/lang3/ObjectUtils
at com.opencsv.CSVParser.<init>(CSVParser.java:207)
at com.opencsv.CSVParserBuilder.build(CSVParserBuilder.java:138)
...
...
Caused by: java.lang.ClassNotFoundException: 
org.apache.commons.lang3.ObjectUtils
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

这个。

我知道这是一个库问题，但我不知道是什么库导致它，或者我是否需要更新或安装某些东西。

I know that is a library problem but I don't know what library is causing it, or if I need to update or install something.

非常感谢。

推荐答案

您似乎没有使用apache commons lang3库： https://mvnrepository.com/artifact/org.apache.commons/commons-lang3

It's seem that you are not using apache commons lang3 library : https://mvnrepository.com/artifact/org.apache.commons/commons-lang3

这篇关于java.lang.NoClassDefFoundError：org / apache / commons / lang3 / ObjectUtils的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！