Version 1.0

Java Developers Kit 1.0, Known Bugs

• Runtime
• Applet Viewer
• Compiler
• Debugger and Other Tools
• Class Libraries
  • AWT (java.awt.*)
  • IO (java.io.*)
  • Net (java.net.*)
  • Util (java.util.*)

You might also want to look at the list of frequently requested features for Java and the Java Development Kit and the changes since the last release. You may also want to review the list of known bugs in the Java and HotJava Alpha 3 release.

To report a bug that is not on this list, please see Submit a Bug Report instructions.

Runtime

Programs with multiple threads do not exit (Microsoft Windows 95 and Windows NT only)

Programs that start multiple threads will not exit under Windows 95 or Windows NT. You can workaround this problem by either calling System.exit(int exitCode) in the last thread running or by monitoring the threads by calling Thread.join(). See java.lang.System or java.lang.Thread for more information. (1234318)

Applet Viewer

Transparent images draw incorrectly using ATI card (Microsoft Windows 95)

Images being drawn with transparent backgrounds will display with their colors reversed (reversed video). (1225819)

Cannot close copyright window (Microsoft Windows 95)

In 640 X 480 screen resolution mode, the Microsoft Windows 95 launch bar covers the AppletViewer copyright window Accept and Reject buttons.

Workaround: Move the launch bar to the side of the desktop, then select one of the AppletViewer copyright window buttons. (1226411)

Tag display dialog box does not display HTML Applet tag width and height

The Applet Viewer tag display dialog box does not display the HTML Applet tag width and height values, instead it displays the applet's actual width and height. (1231235)

File URL's must be debugged in local directories

Running the Applet Viewer in debug mode, file URLs currently throw access violation exceptions or NumberFormatExceptions when referenced outside the current working directory by the debugger. To work around this problem, either set your working directory to the directory which has the class to be debugged (the classes should be in the current directory), or reference the applet from an http URL. (1231289)

Compiler

Compiler cannot distinguish the same class names in different packages

The javac compiler cannot distinguish between the same class name in different packages. So the following code example will return a compiler error:

package pkg;
import java.util.*;

public class Vector
{
    private int i;
    public Vector()
    {
       i = 1;
    }
}

(1231283)

Compiler does not distinguish between class names that are only different by case (Microsoft Windows 95 and Windows NT only)

The javac compiler does not distinguish between class names that are the same except for the case of the name. So compiling the following code example will return a compiler error:

/* file CompilerTest.java */
class CompilerTest
{
   // class definition here
}

/* file compilertest.java */
class compilertest
{
   // class definition here
   void function(CompilerTest ct)
   {
      // do some work here
   }
}

(1230037)

Debugger and Other Tools

jdb can't "run" twice

The Java debugger command "run" can only be invoked once. To start a debugging session over, you must exit and restart jdb (or restart the applet viewer with -debug). (1220930)

Step command in jdb does not work consistently

The debugger step command may fail if the current command attempts to establish a socket connection. The step command may also fail if it has been invoked more than three times in a row. (1221377, 1227931)

Class Libraries

• Abstract Window Toolkit (java.awt)

  FontMetrics.getWidths() returns an array of zeros (Microsoft Windows 95 and Windows NT only)

  FontMetrics.getWidths() returns an array of zeros, it should return an array of character widths in pixels for the current font on the current platform. (1232058)

  Frame.setResizable

  Frame.setResizable(false) does not work. All awt.Frame objects are always resizable. (1231233)

  Frame.location() always reports 0, 0 (Microsoft Windows 95 and Windows NT only)

  Frame.location() always reports 0,0 as its location. It should report its location with respect to the entire desktop that it is in. (1232273)

  Modal Dialogs

  Dialog objects created with "modal = true" have no defined way for the creating thread to block and wait for the user to enter the desired input and therefore do not act like modal dialogs. (1221015)

  List.clear() does not delete all items (Microsoft Windows 95 and Windows NT only)

  List.clear() does not delete all items from a list. The simplest workaround for this problem is to call List.delItems( 0, List.countItems() -1 ) to remove all of the items from a list. See java.awt.List for more information. (1230659)

  TextArea resizes when resetting font (Solaris only)

  TextArea resizes when calling TextArea.setFont(). (1232056)

  Cannot use awt.image.PixelGrabber with offscreen images

  If java.awt.image.PixelGrabber is used to fetch pixels from an offscreen image, PixelGrabber.grabPixels() does not return.

  Workaround: Copy the PixelGrabber source code from the sources.zip src/ directory of the JDK distribution into the applet source code directory, remove or change its package statement, make the following code changes, and include the new class as one of their applet's class.
  Code Changes required to PixelGrabber.grabPixels(long ms):

     if (!grabbing) {
         producer.startProduction(this);
         grabbing = true;
         flags &= ~(ImageObserver.ABORT);
     }
  
  To:
  
     if (!grabbing) 
     {
         grabbing = true;
         flags &= ~(ImageObserver.ABORT);
         producer.startProduction(this);
     }
  

  (1234421)

• Input/Output Package (java.io)

  Asynchronous IO fails (Solaris 2.4)

  Asynchronous IO fails on the original shipping version of Sun Solaris 2.4. This is due to a known problem with Sun Solaris 2.4. A patch is available from Sun Microsystems Inc., patch number: OS patch 101945-34. (1199579)

• Net Package (java.net)

  FTP Protocol not working

  The FTP protocol handler has not been completed yet. When you try to use it, you will receive the following exception:

  java.net.MalformedURLException: unknown protocol: ftp 
  

  (1230799)

• Util Package (java.util)

  java.util.Date.setDate()

  The method java.util.Date.setDate(int date) should recalculate the month, and year when month is 11, when the parameter date is greater than the number of days in the current month. java.util.Date.setDate(int date) should recalculate the day of week. (1226859, 1226864)

  java.util.Date.setMonth()

  The method java.util.Date.setMonth(int month) should recalculate the year when the parameter month is greater than 11. java.util.Date.setMonth(int month) should also recalculate the day of week when the parameter month is greater than 11. (1229001, 1229000)

  java.util.Date.setYear()

  The method java.util.Date.setYear(int year) should recalculate the day of week. java.util.Date.setYear(int year) does not recalculate the month or date when going from a leap day, such as 29-Feb-1992, to a non-leap year. (1229004, 1231114)

  Workarounds for these java.util.Date bugs

  There is a very simple workaround for these java.util.Date bugs. Simply create a new Date object with the correct information in it.

  /* Create new date object for 28-Feb-1996 */
  Date date1 = new Date(96, 01, 28);   
  
  /* Do some work here */
  
  /* Need to set the date to one week after this date
   * This will correctly create a new date of 06-Mar-96
   */
  date1 = new Date( date1.getYear(), 
                    date1.getMonth(), 
                    date1.getDate() + 7, 
                    date1.getHours(),
                    date1.getMinutes(),
                    date1.getSeconds() );
  
  

Java Developers Kit