J Wallace

Thank you. This makes perfect sense now.

I'm having a problem with clipping bounds not being what I expect them to be. I must not fully understand what's going on. Here is a simple example to illustrate the problem:

import java.awt.Dimension; import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.SwingUtilities; public class Example { public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { JPanel panel = new JPanel() { @Override protected void paintComponent(Graphics g) { super.paintComponent(g); System.out.println(g.getClip()); } }; panel.setPreferredSize(new Dimension(100, 500)); JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setContentPane(new JScrollPane(panel)); frame.setSize(100, 200); frame.setVisible(true); } }); } }

In the code above, java.awt.Rectangle[x=0,y=0,width=98,height=144] is initially printed. This seems like a reasonable clip. However, when I scroll down one unit, I get java.awt.Rectangle[x=0,y=144,width=98,height=1]. What is happening here? I was expecting to see something like java.awt.Rectangle[x=0,y=1,width=98,height=144]. Also, if I then scroll back up one unit, I get java.awt.Rectangle[x=0,y=0,width=98,height=1]. Why is it not back to the original clip?

Can someone please explain what's going on? Thank you.

Hello,

I am trying to create a MaskFormatter that formats an elapsed time. The number of elapsed seconds is stored as a Double and should be formatted similar to days:hh:mm:ss.sss. I have come up with an extension to MaskFormatter, inspired by http://weblogs.java.net/blog/hansmuller/archive/2005/08/using_swings_jf.html, which seems to do the job. However, a problem arises after initially inputting an elapsed time. After the initial edit, the value cannot be edited. What am I doing wrong? Here is the code with a main that illustrates the problem:

import java.awt.BorderLayout; import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.text.DecimalFormat; import java.text.ParseException; import javax.swing.JButton; import javax.swing.JFormattedTextField; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.text.MaskFormatter; public class ElapsedTimeFormatter extends MaskFormatter { private static final double SECS_PER_MIN = 60; private static final double SECS_PER_HOUR = 60 * SECS_PER_MIN; private static final double SECS_PER_DAY = 24 * SECS_PER_HOUR; public ElapsedTimeFormatter() { try { setMask("###:##:##:##.###"); setPlaceholderCharacter('_'); } catch (ParseException e) { e.printStackTrace(); } } @Override public Object stringToValue(String string) throws ParseException { if (string.contains("_")) { return super.stringToValue(string); } String tokens[] = string.split(":"); double days = Double.parseDouble(tokens[0]); double hours = Double.parseDouble(tokens[1]); double mins = Double.parseDouble(tokens[2]); double secs = Double.parseDouble(tokens[3]); double elapsedSecs = (days * SECS_PER_DAY); elapsedSecs += (hours * SECS_PER_HOUR); elapsedSecs += (mins * SECS_PER_MIN); elapsedSecs += secs; return new Double(elapsedSecs); } @Override public String valueToString(Object value) throws ParseException { if (!(value instanceof Double)) { return super.valueToString(value); } Double d = (Double) value; StringBuilder result = new StringBuilder(); result.append((d < 0 ? "-" : "")); int days = (int) (d / SECS_PER_DAY); d -= (days * SECS_PER_DAY); int hours = (int) (d / SECS_PER_HOUR); d -= (hours * SECS_PER_HOUR); int mins = (int) (d / SECS_PER_MIN); d -= (mins * SECS_PER_MIN); double secs = d; days = Math.abs(days); hours = Math.abs(hours); mins = Math.abs(mins); secs = Math.abs(secs); DecimalFormat daysFormatter = new DecimalFormat("000"); DecimalFormat leadingZeroFormatter = new DecimalFormat("00"); DecimalFormat decimalFormatter = new DecimalFormat("00.000"); result.append(daysFormatter.format(days)); result.append(":"); result.append(leadingZeroFormatter.format(hours)); result.append(":"); result.append(leadingZeroFormatter.format(mins)); result.append(":"); result.append(decimalFormatter.format(secs)); return result.toString(); } public static void main(String[] args) throws Exception { MaskFormatter formatter = new ElapsedTimeFormatter(); final JFormattedTextField tf = new JFormattedTextField(formatter); final JButton get = new JButton("getValue()"); get.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { Object val = tf.getValue(); System.out.println("val = " + val); } }); JPanel center = new JPanel(new FlowLayout()); JPanel south = new JPanel(new FlowLayout()); center.add(tf); south.add(get); JFrame f = new JFrame("Elapsed Time Formatter"); f.getContentPane().setLayout(new BorderLayout()); f.getContentPane().add(center, BorderLayout.CENTER); f.getContentPane().add(south, BorderLayout.SOUTH); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.pack(); f.setSize(300, 100); f.setVisible(true); } }

Any ideas?

Should I be concerned about the perm gen being at 99% capacity when the JVM crashes?

Hi,

I'm running a Java 1.4.2 application on a Red Hat machine that causes the JVM to crash with a SIGSEGV error. -Xms is 64M and -Xmx is 128M. I first thought that the perm gen size was too low since it always has a high percentage (98/99%) when the JVM crashes. After reading more about the perm gen, though, I'm not so sure. Am I looking down the right path by thinking it may be the perm gen size being too low or is the percentage so high just because the JVM will resize it dynamically? When it crashes the perm gen's total size is around 10/11 MB and its usually 99% full.

Below are some snippets of the JVM's output.

# # An unexpected error has been detected by HotSpot Virtual Machine: # # SIGSEGV (0xb) at pc=0xb7c70b4c, pid=5342, tid=2810452880 # # Java VM: Java HotSpot(TM) Client VM (1.4.2_16-b05 mixed mode) # Problematic frame: # V [libjvm.so+0x196b4c] #

...

Heap def new generation total 4608K, used 3372K [0xa7900000, 0xa7e00000, 0xa82d0000) eden space 4096K, 78% used [0xa7900000, 0xa7c27780, 0xa7d00000) from space 512K, 27% used [0xa7d80000, 0xa7da3ad8, 0xa7e00000) to space 512K, 0% used [0xa7d00000, 0xa7d00000, 0xa7d80000) tenured generation total 60544K, used 21376K [0xa82d0000, 0xabdf0000, 0xaf900000) the space 60544K, 35% used [0xa82d0000, 0xa97b0210, 0xa97b0400, 0xabdf0000) compacting perm gen total 11264K, used 11159K [0xaf900000, 0xb0400000, 0xb3900000) the space 11264K, 99% used [0xaf900000, 0xb03e5c30, 0xb03e5e00, 0xb0400000)

...

--------------- S Y S T E M --------------- OS:Red Hat Enterprise Linux Client release 5 (Tikanga) uname:Linux 2.6.18-8.1.8.el5 #1 SMP Mon Jun 25 17:06:19 EDT 2007 i686 libc:glibc 2.5 NPTL 2.5 rlimit: STACK 10240k, CORE 0k, NPROC 16370, NOFILE 1024, AS infinity load average:0.00 503... CPU:total 2 family 15, cmov, cx8, fxsr, mmx, sse, sse2 Memory: 4k page, physical 1034572k(314260k free), swap 2096472k(2096472k free) vm_info: Java HotSpot(TM) Client VM (1.4.2_16-b05) for linux-x86, built on Sep 17 2007 00:34:43 by unknown with unknown compiler

If it's not the perm gen, does anyone have any other suggestions?