Unknown compiler error with Java.

[Daveyyy]

Hi!

I am not new to java by any means. But there is an error code which I have had described as a corrupt installation.

I am a student and everyone else in the class seems to have had no issues with their install.

Here is the code:

// Program Name: Welcome
// Program Description: A simple program that prints a welcome statement to the console.
// Author: ???
// Date: 09.05.07

public class Welcome
{
public static void Main(String[] args)
{
System.out.prin t("Welcome to Java!");
}

}

The error displayed is this:

Exception in thread "main" java.lang.NoCla ssDefFoundError : Welcome/java

As I said before everyone I have talked to said it is due to corrupt installation. Please help! I need Java to run properly if I am to pass. ^_^

Thanks!

Dave

[r035198x]

Hi!

I am not new to java by any means. But there is an error code which I have had described as a corrupt installation.

I am a student and everyone else in the class seems to have had no issues with their install.

Here is the code:

// Program Name: Welcome
// Program Description: A simple program that prints a welcome statement to the console.
// Author: ???
// Date: 09.05.07

public class Welcome
{
public static void Main(String[] args)
{
System.out.prin t("Welcome to Java!");
}

}

The error displayed is this:

Exception in thread "main" java.lang.NoCla ssDefFoundError : Welcome/java

As I said before everyone I have talked to said it is due to corrupt installation. Please help! I need Java to run properly if I am to pass. ^_^

Thanks!

Dave

Please use code tags if you have to post code.
How did you compile the program?

[JosAH]

Hi!

I am not new to java by any means. But there is an error code which I have had described as a corrupt installation.

I am a student and everyone else in the class seems to have had no issues with their install.

Here is the code:

[code=java]
// Program Name: Welcome
// Program Description: A simple program that prints a welcome statement to the console.
// Author: ???
// Date: 09.05.07

public class Welcome
{
public static void Main(String[] args)
{
System.out.prin t("Welcome to Java!");
}

}
[/code]
The error displayed is this:

Exception in thread "main" java.lang.NoCla ssDefFoundError : Welcome/java

As I said before everyone I have talked to said it is due to corrupt installation. Please help! I need Java to run properly if I am to pass. ^_^

Thanks!

Dave

Oh dear that must be bit rot on your harddisk; burn your computer before it spreads!
Seriously though: haven't you read about a 'main' method, instead of a 'Main' method?

Don't believe what people say about rotten installations and what have you; just
check and check again what you did wrong: one little case mistake; that's it.

Better check your classpath value as well before you start panicking again.

kind regards,

Jos

[Nepomuk]

Hi!

I am not new to java by any means. But there is an error code which I have had described as a corrupt installation.

I am a student and everyone else in the class seems to have had no issues with their install.

Here is the code:
[CODE=java]
// Program Name: Welcome
// Program Description: A simple program that prints a welcome statement to the console.
// Author: ???
// Date: 09.05.07

public class Welcome
{
public static void Main(String[] args)
{
System.out.prin t("Welcome to Java!");
}

}
[/CODE]
The error displayed is this:

Exception in thread "main" java.lang.NoCla ssDefFoundError : Welcome/java

As I said before everyone I have talked to said it is due to corrupt installation. Please help! I need Java to run properly if I am to pass. ^_^

Thanks!

Dave

I think, the error is very simple: your main method is called Main instead of main. Changing that let me compile and run the program.

Greetings,
Nepomuk

[Daveyyy]

Sorry but I forgot I had changed that before I posted. That isn't the problem. With the class named "main" the same issue comes up.
I compile using the command prompt, as this is the way instructed in class.
i.e. "javac Welcome.java" would be the line I use.

However another thing I had neglected to mention was that it in fact does compile. It is when I attempt to run the program that the issue arises.

Again the "Main" in the code I submitted is actually a fix I attempted prior to submitting.

Also, I have tried a complete un-install and re-install. The only other forum I have gone to said that the error comes from a bad install. Ugh!

Thanks again.

[JosAH]

Sorry but I forgot I had changed that before I posted. That isn't the problem. With the class named "main" the same issue comes up.
I compile using the command prompt, as this is the way instructed in class.
i.e. "javac Welcome.java" would be the line I use.

However another thing I had neglected to mention was that it in fact does compile. It is when I attempt to run the program that the issue arises.

Again the "Main" in the code I submitted is actually a fix I attempted prior to submitting.

Also, I have tried a complete un-install and re-install. The only other forum I have gone to said that the error comes from a bad install. Ugh!

Thanks again.

Well, so much for giving us clear diagnostics then. It's a classpath issue: compile
your class, check if the compiled .class file is in your current directory and run
it like this:

java -cp . Welcome

kind regards,

Jos

[Nepomuk]

Sorry but I forgot I had changed that before I posted. That isn't the problem. With the class named "main" the same issue comes up.
I compile using the command prompt, as this is the way instructed in class.
i.e. "javac Welcome.java" would be the line I use.

However another thing I had neglected to mention was that it in fact does compile. It is when I attempt to run the program that the issue arises.

Again the "Main" in the code I submitted is actually a fix I attempted prior to submitting.

Also, I have tried a complete un-install and re-install. The only other forum I have gone to said that the error comes from a bad install. Ugh!

Thanks again.

OK, let's make sure, it isn't a Problem between your chair and table.
You have this code:
[CODE=java]
// Program Name: Welcome
// Program Description: A simple program that prints a welcome statement to the console.
// Author: ???
// Date: 09.05.07

public class Welcome
{
public static void main(String[] args)
{
System.out.prin t("Welcome to Java!");
}

}
[/CODE]and this class is in a file called "Welcome.ja va".
You open a console and change directory until you're in the same directory as "Welcome.ja va". Then you type

javac Welcome.java

and it gives you a compilation error? And this error is:

Exception in thread "main" java.lang.NoClassDefFoundError: Welcome/java

right?

Do check, that you spell everything EXACTLY like I did here - you might run into an error because of case sensitivity. The error you posted suggests, that the compiler can't find your file.

Just making sure:

javac ThisIsAbsoluteNonsense.java

should give the same error (apart from the name of the file of course and providing, you don't have a file named "ThisIsAbsolute Nonsense.java") .

If you followed this exactly, but the error remains, please tell us which Operating system and JDK version you are using. It might be of importance.

Greetings,
Nepomuk

[r035198x]

OK, let's make sure, it isn't a Problem between your chair and table.
You have this code:
[CODE=java]
// Program Name: Welcome
// Program Description: A simple program that prints a welcome statement to the console.
// Author: ???
// Date: 09.05.07

public class Welcome
{
public static void main(String[] args)
{
System.out.prin t("Welcome to Java!");
}

}
[/CODE]and this class is in a file called "Welcome.ja va".
You open a console and change directory until you're in the same directory as "Welcome.ja va". Then you type

javac Welcome.java

and it gives you a compilation error? And this error is:

Exception in thread "main" java.lang.NoClassDefFoundError: Welcome/java

right?

Do check, that you spell everything EXACTLY like I did here - you might run into an error because of case sensitivity. The error you posted suggests, that the compiler can't find your file.

Just making sure:

javac ThisIsAbsoluteNonsense.java

should give the same error (apart from the name of the file of course and providing, you don't have a file named "ThisIsAbsolute Nonsense.java") .

If you followed this exactly, but the error remains, please tell us which Operating system and JDK version you are using. It might be of importance.

Greetings,
Nepomuk

It's probably just a classpath issue.

[JosAH]

It's probably just a classpath issue.

<cough/> reply #6

kind regards,

Jos ;-)

[Nepomuk]

It's probably just a classpath issue.

On the other hand, java Welcome/java (yes, that's a slash!) creates the same error as the OP has. The slash in his/her Exception does surprise me...

[r035198x]

<cough/> reply #6

kind regards,

Jos ;-)

I'll just have another cup of that red bush tea again then.

[Nepomuk]

I'll just have another cup of that red bush tea again then.

Good idea! Can I have some? ;-)

[r035198x]

Good idea! Can I have some? ;-)

Rose bush tea is only for the mature I'm afraid ...

[ambikasd]

Hi!

I am not new to java by any means. But there is an error code which I have had described as a corrupt installation.

I am a student and everyone else in the class seems to have had no issues with their install.

Here is the code:

// Program Name: Welcome
// Program Description: A simple program that prints a welcome statement to the console.
// Author: ???
// Date: 09.05.07

public class Welcome
{
public static void Main(String[] args)
{
System.out.prin t("Welcome to Java!");
}

}

The error displayed is this:

Exception in thread "main" java.lang.NoCla ssDefFoundError : Welcome/java

As I said before everyone I have talked to said it is due to corrupt installation. Please help! I need Java to run properly if I am to pass. ^_^

Thanks!

Dave

Hi Dave,

Even I am a student, and i had the same problem.
The problem was with while setting the classpath in environment variables. In the command prompt you provide the same path where your .class files are going to be stored i.e. the classpath specified by you in the environment variables.

[Nepomuk]

Rose bush tea is only for the mature I'm afraid ...

Well, in that case I'm glad, the bush isn't rose but red! ^^