Running Java program with classpaths

Question

This is one of my first java codes. Pardon me if the question is too naive.

I have an external jar file, an API. I want to be able to call the methods in this API using a java program. I wrote the following code:

update.java:

import java.io.File;
import java.net.URL;
import java.net.URLClassLoader;
import java.io.IOException;
import rediff.inecom.catalog.product.CSVAPI;

class MyFirstClass{
    private final static String api_key = "xyz";
    private final static String path = "/path/to/myfile.csv";

    public void myFunction() {
        CSVAPI cvsapi = new CSVAPI();
        System.out.println(cvsapi);
        try {
            String output = cvsapi.UpdateCSVAPI(api_key,path);
            System.out.println(output);
            System.out.println("Success!");
        }
        catch (Exception e) {
            System.out.println("catch");
            e.printStackTrace(); 
        }
    }

    public static void main(String args[]){
        new MyFirstClass().myFunction();
    }
}

I compiled it using the following command:

javac -cp vendorcatalogapi.jar update.java

I am trying to run it using the following command:

java -cp vendorcatalogapi.jar -cp . MyFirstClass

But I am getting the following error:

Exception in thread "main" java.lang.NoClassDefFoundError: rediff/inecom/catalog/product/CSVAPI
    at MyFirstClass.myFunction(update.java:12)
    at MyFirstClass.main(update.java:26)
Caused by: java.lang.ClassNotFoundException: rediff.inecom.catalog.product.CSVAPI
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    ... 2 more

How can I correctly set the classpath while running the Java program?

Use java -cp .;vendorcatalogapi.jar MyFirstClass with windows, java -cp .:vendorcatalogapi.jar MyFirstClass with Unix(-like). Just a hint: Give the .java files the same name of your java class. It will be much easier for you to find classes. — BackSlash
– BackSlash, Commented Sep 16, 2014 at 9:00

SparkOn · Accepted Answer · 2014-09-16 09:03:12Z

4

try executing this way in windows

java -cp .;path/to/vendorcatalogapi.jar MainClass

in linux environment

java -cp .:path/to/vendorcatalogapi.jar MainClass

answered Sep 16, 2014 at 9:03

SparkOn

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Comments

icza · Accepted Answer · 2014-09-16 09:44:39Z

3

The java and javac commands accept only one cp or classpath parameter.

If you have multiple classpath elements, you can concatenate them using a separator element which is ';' on windows and ':' on unix systems:

javac -cp .;vendorcatalogapi.jar update.java
java -cp .;vendorcatalogapi.jar MyFirstClass

edited Sep 16, 2014 at 9:44

answered Sep 16, 2014 at 9:04

icza

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