?
Solved

Cannot compile JAVA program on Windows 7 PC

Posted on 2014-10-22
7
Medium Priority
?
351 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 2000 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
VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

 
LVL 28

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

Want to be a Web Developer? Get Certified Today!

Enroll in the Certified Web Development Professional course package to learn HTML, Javascript, and PHP. Build a solid foundation to work toward your dream job!

Question has a verified solution.

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

Java contains several comparison operators (e.g., <, <=, >, >=, ==, !=) that allow you to compare primitive values. However, these operators cannot be used to compare the contents of objects. Interface Comparable is used to allow objects of a cl…
Basic understanding on "OO- Object Orientation" is needed for designing a logical solution to solve a problem. Basic OOAD is a prerequisite for a coder to ensure that they follow the basic design of OO. This would help developers to understand the b…
Viewers learn about the scanner class in this video and are introduced to receiving user input for their programs. Additionally, objects, conditional statements, and loops are used to help reinforce the concepts. Introduce Scanner class: Importing…
This tutorial covers a practical example of lazy loading technique and early loading technique in a Singleton Design Pattern.
Suggested Courses
Course of the Month9 days, 13 hours left to enroll

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