Question

I’m not sure why I get a java.lang.NoClassDefFoundError runtime error on the following line:

  this.startBtn.addMouseListener(new MouseAdapter() {
    public void mouseClicked(MouseEvent e) {
      startClicked();
    }
  });

in an Applet. It compiles fine. How can the jre not find a core awt class? I use the same line in a different applet without issues. What am I not understanding?

Thanks in advance

Answer 1

Take a look at “NoClassDefFoundError in Java Applet on invokeLater()“. Compiling the class that contains your code snippet will produce other class files like MyClass$1.class. Make sure they’re also deployed.