I doubt the problem has to do with threads. The javametrics are aquired in a
non-AWT loop that sleeps until the AWT thread has settled down and the
required info is available. My quess is that the loop is allowed to time out
to early in Norman's situation. There would be no harm in increasing the
time allowed and when I get a chance I will provide a version that simply
waits longer to see if that fixes the problem. Java initialization from
scratch is a surprisingly long winded process.
----- Original Message -----
From: "Oleg Kobchenko" <[EMAIL PROTECTED]>
To: "General forum" <[email protected]>
Sent: Tuesday, May 06, 2008 11:05 PM
Subject: Re: [Jgeneral] Further on "Failed to get Java metrics" error and
asimple workaround
It is commandable to do this research, but...
Splashes are annoying. So is it worth replacing one annoyance
with another?
It was noticed earlier that there may be an issue with accessing
AWT from main thread.
So maybe this route can be pursued first?
Oleg
On May 6, 2008, at 19:45, "N. Drinkwater" <[EMAIL PROTECTED]> wrote:
Several posts last month reported that starting J 6.02 on OSX resulted in
an error message-"Failed to get Java metrics." Although this error is a
minor annoyance when running the IDE, it would be potentially very
confusing for end users of standalone applications.
Investigating the problem further, I found that the error occurs the first
time J is started after every reboot. I've only encountered the error on
OSX 10.4 (PPC) and 10.5 (Intel), both running Java SE 5. I had no problem
running on linux (Ubuntu 7 and Fedora 8, Java SE 6). The error does not
occur if any java program is run prior to starting J (including the prior
failed attempt to start J).
As a simple workaround (until either Java on OSX or j.jar is fixed), a
simple "splash screen" program can be inserted into the jwd script just
prior to the execution of J. With the addition of the splash screen, the
Java metrics error does not occur (even after a reboot) with the cost of a
few seconds additional startup time. The change to the startup isn't
worthwhile for users of the IDE who don't turn their computer off very
often, but if you're distributing a program for use by non-J programmers
it may be worth consideration. The revised start up script and java class
for the splash screen are given below.
Norman Drinkwater
The revised jwd script is as follows (the last two lines are a single line
of code):
#!/bin/sh
# problems - see J bin/install.htm
cd "`dirname "$0"`/.."
java -jar bin/Splash.jar
java -Xss8000000 -Xdock:name=J -Xdock:icon=bin/icons/jred.icns -jar
bin/j.jar "$@"
The splash screen is adapted from code in a book on Swing by Loy et al.
(I don't do Java, only J these days, so others may have a better
solution.)
/*
SplashScreen.java
Based on Java Swing (2nd ed.), by Loy et al.
*/
// Displays a simple text splash screen and exits after two seconds.
//
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Toolkit;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JWindow;
public class SplashScreen extends JWindow {
private int duration;
public SplashScreen(int d) {
duration = d;
}
public void showSplash() {
JPanel content = (JPanel) getContentPane();
content.setBackground(Color.white);
// Set the window's bounds, centering the window
int width = 80;
int height = 80;
Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
int x = (screen.width - width) / 2;
int y = (screen.height - height) / 2;
setBounds(x, y, width, height);
// Build the splash screen
JLabel logo = new JLabel("J",
JLabel.CENTER);
logo.setFont(new Font("Serif", Font.BOLD, 72));
logo.setForeground(Color.red);
content.add(logo, BorderLayout.SOUTH);
// Display it
setVisible(true);
// Wait a little while
try {
Thread.sleep(duration);
} catch (Exception e) {
}
setVisible(false);
}
public void showSplashAndExit() {
showSplash();
System.exit(0);
}
public static void main(String[] args) {
SplashScreen splash = new SplashScreen(2000);
splash.showSplashAndExit();
}
}
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