Solved

Cannot compile JAVA program on Windows 7 PC

Posted on 2014-10-22
7
327 Views
Last Modified: 2014-10-27
When I compile the above program via command prompt: javac HelloWorld.java
The program compiles and I see HelloWorld.class file.
Now when I execute the command on command prompt: java HelloWorld
I get error:
Error: Could not find or load main class HelloWorld

I have installed JDK at the location C:\Program Files\Java\jdk1.8.0_25
and the environment variable JAVA_HOME has been set as C:\Program Files\Java\jdk1.8.0_25


----HelloWorld.java-----------
public class HelloWorld {

    public static void main(String[] args) {
        System.out.println("Hello, World");
    }

}
0
Comment
Question by:toooki
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 2
7 Comments
 
LVL 86

Accepted Solution

by:
CEHJ earned 500 total points
ID: 40398265
Try

java -cp . HelloWorld

Open in new window

0
 

Author Comment

by:toooki
ID: 40398299
It works, thank you.
Could you kindly let me know how to avoid this "-cp ." every time.
Before I could run using java HelloWorld
Somehow after upgrading to the next Java version, some setup probably got changed.
I added JAVA_HOME and CLASSPATH environment variables. Is there anything else that needs to be setup?

Thank you.
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 40398302
Yes, i would recommend NOT setting CLASSPATH anything other than dynamically
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 27

Expert Comment

by:rrz
ID: 40399828
If you have a CLASSPATH environment variable defined, then the VM uses the paths listed in the CLASSPATH environment variable rather than searching using its default paths. As a result, if you set this environment variable you need to add the current path otherwise the VM will not find classes in the current working directory.
from http://www.cs.swarthmore.edu/~newhall/unixhelp/debuggingtips_Java.html
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 40399854
Yes. But even if you do include the current directory in the CLASSPATH you can often get nasty results. Fixed classpaths tend to be write once and forget.
0
 

Author Comment

by:toooki
ID: 40405721
Thank you!
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 40405917
:)
0

Featured Post

Free Tool: Postgres Monitoring System

A PHP and Perl based system to collect and display usage statistics from PostgreSQL databases.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Java exception bubble up 2 24
passing enum to a method 4 34
Java array 10 55
Strange router problem - can't access hotmail.com 14 38
Are you developing a Java application and want to create Excel Spreadsheets? You have come to the right place, this article will describe how you can create Excel Spreadsheets from a Java Application. For the purposes of this article, I will be u…
Introduction This article is the last of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers our test design approach and then goes through a simple test case example, how …
Viewers learn about the “for” loop and how it works in Java. By comparing it to the while loop learned before, viewers can make the transition easily. You will learn about the formatting of the for loop as we write a program that prints even numbers…
This video teaches viewers about errors in exception handling.

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question