Cannot write class file...

I have no idea what this means. This app was running just
fine. Then wham.
Here is the error message:
Errors reported by Java compiler: Found 1 semantic error
compiling
"D:/CFusionMX/wwwroot/WEB-INF/cfclasses/cfApplication2ecfm855244706.java":
1. public final class cfApplication2ecfm855244706 extends
coldfusion.runtime.CFPage{ <-------------------------> ***
Error: Cannot write class file "cfApplication2ecfm855244706.class"
because that name conflicts with the name of the class file
"cfapplication2ecfm855244706.class" in directory "cfclasses". This
is illegal because file names are case-insensitive in this system.
If anyone can tell me where to look and what to do here, I
would be very grateful.
Thanks,
Lee

Try clearing out your cfclasses directory which is located on
your machine at D:\CFusionMX\wwwroot\WEB-INF\cfclasses. Then
restart CF.

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at com.sun.corba.se.internal.iiop.RequestProcessor.process(RequestProcessor.java:81)
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MyCoy wrote:
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thanks. but what is FQN ?
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You didn't close the second PrintWriter after you finished using it?

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Hi,
I have installed J2SDK1.4.2_03 in D: drive in folder JavaApplications.
Have appended the path: ;D:\JavaApplications\bin in System Variable.
Written a simple program named WhatIsYourName.java and saved in D:\JavaPractices
At D:\JavaPractices> compile the program using javac WhatIsYourName.java and it is OK
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When I checked the C:\Program Files, there is a bin and lib folders residing in a 1.3.1_07 folder in the JRE folder. The JRE folder is found in a folder called JavaSoft. Is it because of this that the error occurred?
Could not understand why?
Please help.
Thank you very much.
Theophilus

Hi ChuckBing,
You are right. The older version is being found first. After removing the older version I can run the .class file.
Need to ask you about checking the full path when invoking java which you suggested. At D:\JavaPractices directory am I supposed to type \JavaApplications\bin\java WhatIsYourName ? I don't quite get what you mean.
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I can compile java, but I cannot run class file.

Exception in thread "main" java.lang.NoClassDefFoundError: Demonstrate
That is the error I get when I type: java Demonstrate
I have "C:\j2sdk1.4.0\bin" in the path for the Environment Variables in windows xp. I've even tried to insert that into a CLASSPATH several ways and it does not change the error.
javac Demonstrate.java works fine. That compiled file can work on other computers. Because of that, I do not think it's a setting error. Any ideas ? Thanks for any help.

Microsoft problem? I like nothing better than bashing M$, but this sounds like a CLASSPATH problem to me.
I'll assume that your Demonstrate.java does NOT have a package statement in it and has a main method that you'd like to run. If so, you compile like this:
javac Demonstrate.javaThe result is a Demonstrate.class file in the same directory as Demonstrate.java.
Now, type this in the command shell right in the directory where Demonstrate.class lives to run it:
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Cannot write to file

Hello everyone,
I'm new to java and I need some help for writing to a file, I wrote a programe using the AWT that is suppose to read from a file as soon as the programs comes up, then changes could be made and resubmitted, but I can't seem to capture the new written text, can someone help me please!! here is the code
import java.applet.*;
import java.awt.*;
import java.io.*;
import java.net.URL;
import java.lang.*;
import java.awt.event.*;
public class EditFile2 extends Panel implements ActionListener
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                                "line17", "line18", "line19", "line20"};
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System.out.println(in[i]);
this.textfieldnames[i] = in[i];
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catch(SecurityException e){
System.out.println("file not security");
//g.drawString("e" + e, 1, 1);
editPanel.setLayout(new GridLayout(21, 2));
for(int row=0; row< textfieldnames.length; row++){
editPanel.add(new TextField (textfieldnames[row]));
editPanel.add(new Label(labelnames[row]));
submitButton = new Button("Enter New Scroll Lines");
editPanel.add(submitButton);
submitButton.addActionListener(this);
setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.gridx= 1; c.gridy =1;
c.weightx=1.0;
add(editPanel, c);
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try{
FileOutputStream fos = new FileOutputStream("C:/Program Files/s1studio_jdk/j2sdk1.4.1_02/javastuff/sampledir/icc.txt");
DataOutputStream dos = new DataOutputStream(fos);
for(int i=0; i<20; i++){
dos.writeBytes(new String(textfieldnames[i]));
System.out.println("writing to file");
catch(IOException ioe){
System.out.println("file not found" +ioe);
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private FileInputStream fis;
private BufferedInputStream bis;
private BufferedReader dis;
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f.pack();
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Hi islandcat,
I don't understand your question.
You've got values that you read from a file. You're talking about values in text boxes. Please try to write a sensible sequence of events that you want to happen and tell me where the behavior you observe goes wrong.
Maybe you're saying this:
1. Read initial values for text boxes from a file on startup.
2. Allow users to modify values in text boxes during operation.
3. Save altered values to file again when shutting down the app.
I didn't study your code carefully enough to really understand what you're doing. I'm not sure that I want to.
I've taken care of your exceptions. Unwanted behavior is really your problem. I'd suggest that you study what you've done more carefully and try to figure it out for yourself. You'll get some satisfaction out of having solved a real problem. You might even learn something about how to go about it. - MOD

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I am a new Java developer and now, I am facing a problem regarding the error 500. I try to grab records from a table with a date as a constraint. There are two servlets involed: a) saveRecord and b) getRecord. Servlet getRecord will grab data from a database while another servlet, saveRecord will get the data from servlet getRecord and save it into a file. The codes are as below:
=========================================================================================================================================
// Servlet Name : saveRecord
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BufferedOutputStream outstr     = null;
PostMethod http_post          = null;
http_post = new PostMethod("getRecord");
http_client.executeMethod(http_post);
instr     = new BufferedInputStream(http_post.getResponseBodyAsStream());
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int byte_at;
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=========================================================================================================================================
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out = response.getOutputStream();
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Then, the result will be post back to a JSP page. It didn't work when the records in database growing bigger ( > 100 000 records) but works nice while the records are still in a small quantities ( < 20 000 records). It seems that no record can be inserted into the file and the JSP page becomes blank. When I opened the csv file, I found a message"Error 500:" inside it.
Hope you all experts can help to figure out this problem. TQ

I am amatuer in Java Programming, so I don't know how to implement serializable interface but I will look through it.
However, as I mention before, the code run perfectly if there are not much records un the table. But once there are more and more table added in (> 1000 000 records) in the table, it becomes unstable - sometime it works but most of the time it doesn't. So, I didn't find any different event I replaced the code with String date = "=2000-01-01".
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2. Open Terminal.
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Reading & writing binaries(.class files)

folks,
how does one go about reading and writing .class files in java. I am able to write 'em only in ASCII format which is not what i want.
Thanks!

Did anybody say anything about disassembling?He wants to read and write class files, it's the title of the post.
I don't appreciate you dismissing my suggestions like that.
There's plenty of gotchas in reading and writing class files, such as Longs & Doubles taking up 2 positions in the constant pool.
Hence the reason why I suggested using an open source library like BCEL or ASM. These are still valid as class readers, even if you don't touch the byte code. ( disassembly )
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