NoClassDefFoundError

public class HelloWorld {

public static void main (String[] args){

System.out.print("Hello World!");

}
}
-------------------------------------------------------
This is my code but when i run it, I get this:

java.lang.NoClassDefFoundError: HelloWorld/java
Caused by: java.lang.ClassNotFoundException: HelloWorld.java
at java.net.URLClassLoader$1.run(URLClassLoader.java: 202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.j ava:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:3 07)
at sun.misc.Launcher$AppClassLoader.loadClass(Launche r.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:2 48)
Could not find the main class: HelloWorld.java. Program will exit.
Exception in thread "main"
Process completed.


Please HELP!! I really need to fix this..

You haven't compiled your sources yet and you are trying to run your HelloWorld.java source file.

kind regards,

Jos

You left off the command that you issued to get the error message.

You must have used the java command instead of the javac command.
See:"Hello World!" for Microsoft Windows (The Java™ Tutorials > Getting Started > The "Hello World!" Application)

thankz for ur comment and i appreciated it...
im using JCreator Pro and I'm sure that not the problem...
I think the classpath or watever.. but i set my classpath to the JDK/bin

Quote:

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i set my classpath to the JDK/bin

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That is where the path should point, not the classpath. The bin folder contains .exe files and the path is used by the OS to find them.
The classpath is used to find the definition of class by javac.exe and java.exe

Did you compile your source file and create a .class file?

You need to get advice on how to use your IDE. There is a part of this forum for IDEs. Try asking about your problem there.

Quote:

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Originally Posted by PeDz

thankz for ur comment and i appreciated it...
im using JCreator Pro and I'm sure that not the problem...
I think the classpath or watever.. but i set my classpath to the JDK/bin

---

Have you compiled your class? Your inital attempt clearly showed that you were trying to run a .java file; .java files contain your source code and cannot be run. You need to compile your source file and produce a .class file; .class files can be run. Read a tutorial on the basics before you are trying to do something.

kind regards,

Jos

yeah... there's a .class file produced...
this problem started when i used the prompt for main method from CONFIGURE>OPTIONS>JDK TOOLS>DEFAULT>EDIT>PARAMETER

There is a part of this forum for IDEs. Try asking about your problem there.

public class HelloWorld {

public static void main (String[] args){

System.out.print("Hello World!");

}
}
-------------------------------------------------------
This is my code but when i run it, I get this:

java.lang.NoClassDefFoundError: HelloWorld/java
Caused by: java.lang.ClassNotFoundException: HelloWorld.java
at java.net.URLClassLoader$1.run(URLClassLoader.java: 202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.j ava:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:3 07)
at sun.misc.Launcher$AppClassLoader.loadClass(Launche r.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:2 48)
Could not find the main class: HelloWorld.java. Program will exit.
Exception in thread "main"
Process completed.


Please HELP!! I really need to fix this..

HelloWorld.java is not a class file, it is a source file. Did you compile? How are you trying to run the program?
Suggested reading: Lesson: The "Hello World!" Application (The Java™ Tutorials > Getting Started)

yeah i compied it... this problem started when i used the "prompt for main method" from
CONFIGURE>OPTIONS>JDK TOOL>PARAMTERS

i did but no one's helping... I'm doomed T_T

Please don't violate forum rules and double post:
http://www.java-forums.org/new-java/...ounderror.html

Please don't violate forum rules and double post
http://www.java-forums.org/jcreator/...ounderror.html

Quote:

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i did but no one's helping... I'm doomed T_T

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That's a great way to thank those that are trying to help

Quote:

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Originally Posted by doWhile

Please don't violate forum rules and double post
http://www.java-forums.org/jcreator/...ounderror.html

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I can't say that I blame him as he was suggested to do this by a moderator. Though for my money, I'd just as soon move this over to the IDE section myself, and in fact I think that I'm going to do just that.

Edit: instead, I just merged threads. This may be a little confusing... :(happy):

Quote:

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Originally Posted by Fubarable

I can't say that I blame him as he was suggested to do this by a moderator.

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Sorry...missed that. Thanks for merging them (I don't like contributing to one post to find a full blown discussion elsewhere in response to the exact same thing).

im really sorry... can u advice me what to do in my problem?? i cant start my chat project if i cant solve this... plz i really need some advice...

Try using the command line for compiling and and executing the code.