Java stopped working

I have some Java sources that I have compiled into classes. They have been working fine for the past 6 months.
Today suddenly Java is giving an error in thread main of java.lang.NoCLassDefFoundError, which is the same error it gives if there is no class file.
I went back and tested Java on my backups and they all give the same error. It is like Java is unable to find the .class file.
I tried using the .bat files that have worked in the past to start up my Java app. I have tried typing out the full paths to both the java.exe and the .class file. I have recompiled the source into a .class
Nothing works and all fail.
Any ideas why java would stop functioning? Only things I can think of were that I ran Spybot Search and destroy and AdAware a couple days ago. All they found were cookies.
I have not done a Windows Update in a couple weeks. I always update Manually.
Java version is using 1.4.2_05
I tested it on a small Java HelloSwingApplet.class and get the same error.
I rebooted the machine but no luck.
Any clues why Java would suddently fail to fine any classes?

What should I set the ClassPath= to by default? What do you mean? You should not set the CLASSPATH environment variable at all.
When you run a Java program, you should give it whatever classpath is appropriate for it using -cp or -classpath on the command line. What's "appropriate" will vary from program to program, and you need to be able to determine that yourself. We can't tell you because we don't know your programs, where they live, what classes they use, etc.
This might help.
Javapedia: Classpath
Setting the class path (Windows)
How Classes are Found
java -cp .;<any other directories or jars> YourClassNameYou get a NoClassDefFoundError message because the JVM (Java Virtual Machine) can't find your class. The way to remedy this is to ensure that your class is included in the classpath. The example assumes that you are in the same directory as the class you're trying to run.
javac -classpath .;<any additional jar files or directories> YourClassName.javaYou get a "cannot resolve symbol" message because the compiler can't find your class. The way to remedy this is to ensure that your class is included in the classpath. The example assumes that you are in the same directory as the class you're trying to run.
I tried the c:\j2sdk1.4.2_05 and c:\j2sdk1.4.2_05\lib
and c:\j2sdk1.4.2_05\jre\lib and none are workingYeah. No. That would be a bad idea.
What is the normal setting for the ClassPath
variable? Nonexistent, if you do it right.

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LockeZ wrote:
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Hi,
In order to narrow down the cause of the issue, would you please provide the complete error you received? In addition, have you tried to uninstall Java completely and download latest version
from http://www.java.com/en/ to see if it could resolve the issue?
Best Regards,
Andy Qi
Andy Qi
TechNet Community Support

Hello. After this update(Java for OS X 2013-003) stop working Ps3 media server. How to fix it?

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version: 6.0.260.3
timestamp: 4dc1160c
Fault Module: java.dll
Fault Version: 6.0.260.3
Fault TimeStamp: 4dc14bf1
Exception Code: c0000005
offset: 00004e2f
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Locale ID: 1033
Additional 1: 1ec0
Additional 2: 1ec0fd70d07d06e5bfcf53c69ad1739
Additional 3: 2c48
Additional 4: 2c48940de5e7d1cb2e131ad6a0ca2feb
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import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JComponent;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
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 {"Philip", "Milne",
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 table.setRowSelectionAllowed(false);
 if (ALLOW_COLUMN_SELECTION) { // false by default
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 if (DEBUG) {
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// printDebugData(table);
// ==============================================
// Changed to do a changeSelection() on a right-click
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// ==============================================
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 JScrollPane scrollPane = new JScrollPane(table);
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 add(scrollPane);
 private void printDebugData(JTable table) {
 int numRows = table.getRowCount();
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 System.out.println("Value of data: ");
 for (int i=0; i < numRows; i++) {
 System.out.print(" row " + i + ":");
 for (int j=0; j < numCols; j++) {
 System.out.print(" " + model.getValueAt(i, j));
 System.out.println();
 System.out.println("--------------------------");
 * Create the GUI and show it. For thread safety,
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 frame.setVisible(true);
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 //Schedule a job for the event-dispatching thread:
 //creating and showing this application's GUI.
 javax.swing.SwingUtilities.invokeLater(new Runnable() {
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}

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