Re: my java is broken !
On 04/29/2012 04:06 PM, Arved Sandstrom wrote:
On 12-04-29 07:21 PM, bilsch wrote:
On 04/29/2012 07:25 AM, Joshua Cranmer wrote:
On 4/29/2012 7:13 AM, bilsch wrote:
I wrote a loop to read a 26000 character text file NVRAM.TXT into a
character array. It worked fine. The program is listed below. It has
only 24 lines. Today when I run it, it has weird errors referenced to
line numbers 2442, 2685 and 1620. When I click on those error messages
it shows lines in a completely different program - a program that I
never wrote for sure. I saved the file with a different name and it runs
fine with that name - no errors. The file name that has the problem is
Nvj5. That is the file selected and displayed when I click RUN FILE. It
is the file listed below. Even though it is selected and displayed when
I click RUN FILE my system is running some other huge file instead. Has
anyone ever heard of a problem like this?
When you refuse to mention error messages, the answer becomes "I have no
clue."
It would also help to know what the command line is that is causing it.
It could be that your IDE is buggy, too (since it sounds like you rely
on a specific IDE feature).
I can't tell you the error messages now because I deleted the offending
file - so can't generate errors anymore. It seems the error messages
are irrelevant since they point to lines in some large unknown program.
Your system is not "running" some other "file", not in the sense that
you think. Your Java source files are compiled into .class files, these
are loaded up into memory as required, and broadly speaking it's the
bytecodes in these class files that get executed ("run"). The first
application code to execute is the proper main() method in your main
class...like Nvj5.main(). Since you are using standard library code
also, like FileInputStream, code in those classes - and in the classes
that FileInputStream uses, and so on and so on - also gets executed.
That mysterious huge file is a standard library class that your code
needs to work. It's not irrelevant. A high percentage of the time when
you write buggy code the errors start in library code, not in your own
code. You need to look at the entire stack. You will notice that
somewhere in the stack are line references to your own code also.
You deleted and renamed *which* files exactly? Also, you have a class
Nvj5 but a corresponding source file "Nvj5.java". You'll find that
people understand you better if you differentiate between data files
(like NVRAM.TXT) and source files (like Nvj5.java).
Are you saying that you renamed class Nvj5 in source file Nvj5.java to
class Pwll12 in source file Pwll12.java, say, and ever since your
program has run like a charm? That seems highly unlikely. In fact that's
astronomically unlikely.
I copied the source from the offending file then I deleted the entire
project folder - everything. Then I created a new project and a new
blank .java file and pasted the copied source in that new file. I used
new names for the new file and folder. Once I did that the source(in
the new file) ran without a glitch. I tested it several times over a
period of days and it always worked. NOW, TODAY THE NEW FILE HAS GOTTEN
THE SAME PROBLEM JUST LIKE THE OLD FILE I have the error information
pasted below along with the source, also below. The error lines are in a
different file than the one I am running - now named Nvr1.java..
What IDE or programming text editor are you using? How many "main"
classes are currently available in your workspace? When you tried that
failing run did you see any console output at all?
I am using NetBeans to do exerything.
AHS
THE ERROR INFORMATION:
run:
Exception in thread "main" java.lang.VerifyError: Constructor must call
super() or this() before return in method Nvr1.<init>()V at offset 0
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2442)
at java.lang.Class.getMethod0(Class.java:2685)
at java.lang.Class.getMethod(Class.java:1620)
at sun.launcher.LauncherHelper.getMainMethod(LauncherHelper.java:488)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:480)
Java Result: 1
BUILD SUCCESSFUL (total time: 4 seconds)
THE SOURCE:
import java.io.*;
public class Nvr1 {
public static void main(String[] args){
try {
FileInputStream file = new FileInputStream("NVRAM.TXT");
char[] nvchr = new char [30000];
int fin = 1;
int count = 1;
while (fin != -1) {
fin = file.read();
nvchr[count] = (char) fin;
System.out.print(nvchr[count]);
count++;
}
System.out.println("Bytes read : " + count);
file.close();
} catch (IOException e){
System.out.println("Could not read file");
}
}
}
TIA. Bill S.