Issues with running a compiled java program

Question

I am a Java beginner. I wrote a quintessential "Hello, World!" program. It compiles, but won't run. The terminal says there is an exception in the thread main, and that the class hello is not found. I am using Ubuntu 12.04. What could be wrong here?

The file is called hello.java.

The commands I used:

$javac hello.java
$java hello

My code is below:

class hello{
public static void main(String[] args) {
    system.out.print("Hello");  
}
}

EDIT-----------------------------------------------------------------------------------------

I just realized that I am using openjdk7. Does that pose a problem?

What package is the class in, and how are you trying to run it? edit Beaten to it... — Desidero
– Desidero, Commented Sep 28, 2013 at 18:19
Tell us whether you can see a file called hello.class anywhere. Try running the program from the same directory that this file is in. — Dawood ibn Kareem
– Dawood ibn Kareem, Commented Sep 28, 2013 at 20:30

pieter · Accepted Answer · 2013-09-28 18:25:19Z

1

class must be: public class hello system.out.print is wrong, must be: System.out.println("Hello World");

answered Sep 28, 2013 at 18:25

pieter

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3 Comments

Siva Kumar Reddy G Over a year ago

If syntax is wrong compilation fails. In the question @tys says the program is compiling.

tys Over a year ago

@pieter, Thank you. I just tried this; however, it is still throwing the same error.

tys Over a year ago

It is compiling fine.

William Moffitt · Accepted Answer · 2013-09-28 19:39:53Z

1

Is the filename hello or Hello? The only way I duplicated your problem was by having the class name wrong, and in java the class name an filename must exactly match (meaning the case too). So if your filename is Hello.java and the class name is hello the program will compile fine but throw the same error you mentioned. This is just a guess though.

answered Sep 28, 2013 at 19:39

William Moffitt

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Comments

Tassos Bassoukos · Accepted Answer · 2013-09-28 18:18:52Z

0

Is that all your code? Since you use a terminal, can you add the results of the command ls -lR to your question? (run it in the same directory as your original command executing the application).

answered Sep 28, 2013 at 18:18

Tassos Bassoukos

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2 Comments

tys Over a year ago

I can't add it. The result is probably 1000 lines

Tassos Bassoukos Over a year ago

Ah, ok - try java -cp . hello

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