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  1. JDK
  2. JDK-4461210

Robot.delay() causes null pointer exception when XTEST extensions are not avail.

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    • Icon: Bug Bug
    • Resolution: Duplicate
    • Icon: P4 P4
    • None
    • 1.3.0
    • client-libs
    • sparc
    • solaris_7



      Name: yyT116575 Date: 05/21/2001


      $ ./java -version
      java version "1.3.0_02"
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0_02)
      Java HotSpot(TM) Client VM (build 1.3.0_02, mixed mode)
      $


      This may be a new bug ... or a duplicate of 4251318 ... it probably is a
      duplicate if Robot.delay(int) spawns a child process.

      The following program gets a null pointer exception when ran on a Solaris
      machine via an X-Term on a PC:

      import java.awt.*;
      import java.awt.event.*;
      import javax.swing.*;

      public class Foo {
         
        private class Bar extends Thread {
          public void run() {
            Robot r = null;
            try {
              r = new Robot();
            } catch(Exception e) {
              System.out.println("ERROR!!!");
            }

            for (int i=0; i<10; i++) {
              System.out.println("Bar ["+i+"]");
              System.out.flush();
              r.delay(500);
            }
            System.exit(0);
          }
        }
         
        public void runFoo() {
          new Bar().start();
        }
         
        public static void main(String[] args) {
          Foo f = new Foo();
          f.runFoo();
        }
      }


      The output is:

      Bar [0]
      java.lang.NullPointerException
              at Foo$Bar.run(Foo.java:13)
      (Review ID: 124648)
      ======================================================================

            serb Sergey Bylokhov
            yyoungsunw Yung-ching Young (Inactive)
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