Java异常处理 如何跟踪异常的传播路径

// UsingExceptions.java
// Demonstrating the getMessage and printStackTrace
// methods inherited into all exception classes.
public class PrintExceptionStack {
  public static void main( String args[] )
  {
   try {
     method1();
   }
   catch ( Exception e ) {
     System.err.println( e.getMessage() + "\n" );
     e.printStackTrace();
   }
  }
  public static void method1() throws Exception
  {
   method2();
  }
  public static void method2() throws Exception
  {
   method3();
  }
  public static void method3() throws Exception
  {
   throw new Exception( "Exception thrown in method3" );
  }
}