error problem

[Ezra]

i am currently running fedora core 3 and it happens to have java 1.4.2 in it. can someone tell me what does this error mean? i have successfully compiled it free of errors but i can't run it :

Exception in thread "main" java.lang.NoClassDefFoundError: Average.java
at gnu.gcj.runtime.FirstThread.run() (/usr/lib/libgcj.so.5.0.0)
at _Jv_ThreadRun(java.lang.Thread) (/usr/lib/libgcj.so.5.0.0)
at _Jv_RunMain(java.lang.Class, byte const, int, byte const, boolean) (/usr/lib/libgcj.so.5.0.0)
at __gcj_personality_v0 (/home/ezzmir/documents/java.home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre)
at __libc_start_main (/lib/tls/libc-2.3.3.so)
at _Jv_RegisterClasses (/home/ezzmir/documents/java.home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre)


thanks.

[NoteMe]

Did you get thouse errors when you ran it in the IDE? If so, are you able to set some break points around, and try to find out what caused it.


Or if the app is not a big secret you might want to attach the app here, so me or someone else can see if we find out. The error message doesn't tell me much. Sorry.



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[System_Error]

Yep, that looks like a classpath/path problem, or you are using a crappy IDE like netbeans.

[NoteMe]

Yep, that looks like a classpath/path problem, or you are using a crappy IDE like netbeans.

I am using NetBeans. At the moment version 4, and I can't complain yet.


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[System_Error]

Well, just my personal opinion.

[Ezra]

well actually i used the terminal to compile and execute it. it did compile without errors but could not run. or maybe fedora core 3 doesn't have java.io.* class library?

[System_Error]

Ok, if it's a runtime exception like that, maybe somethings wrong with your jvm, or your code...Would you mind posting your code?

[CornedBee]

How are you calling the program? Do you have any package declarations in the source? Do you have a CLASSPATH environment variable set? What is your directory tree where you have the app?

[Ezra]

the code is just like this :

import java.io.*;
class Average {
public static void main(String[]args) throws IOException {
int num=0, tot=0, ave;
char gra;

while (num<=10) {
System.out.println("input grade ");
gra=(char)System.in.read();
if(gra=='A')
tot+=4;
if(gra=='B')
tot+=3;
if(gra=='C')
tot+=2;
if(gra=='D')
tot+=1;
System.in.skip(2);
num++;
}
ave=tot/num;
System.out.println("Average grade : "+ave);
}
}

another thing guys. if java is a rather platformless language right, then the way we write the code, compile it and declare anything in it should be the same way regardless of the platform right? thanks.

[CornedBee]

How do you call the program? And from where? What's your classpath?

Java can be quite confusing to get it running the first time.