Applet Memory Leak - Resizing Images
Hello,
I'm having an issue with a Java Applet I have written. The applet reads a directory listing, and displays resized thumbnails in a JTable. The problem is, if the user loads a directory with a lot of large images, the memory usage sky rockets, and is not freed after the user shuts down the applet.
Below is the code which adds the resized image to a custom table model:
public void leftClick(){
main.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
FileSystemView fsv = FileSystemView.getFileSystemView();
ImageIcon thumbnailIcon = new ImageIcon();
ImageIcon icon = new ImageIcon();
File selectedFile = fileTree.getSelectedFile();
Image scaledImage;
if(selectedFile!=null){
if (selectedFile.isDirectory()){
File subFiles[] = selectedFile.listFiles();
mvtm.clearList();
fileTable.removeAll();
TableColumn col = fileTable.getColumnModel().getColumn(0);
col.setMaxWidth(35);
col = fileTable.getColumnModel().getColumn(1);
col.setPreferredWidth(200);
col = fileTable.getColumnModel().getColumn(3);
col.setPreferredWidth(0);
col.setMaxWidth(0);
for(int i = 0;i<subFiles.length;i++){
if(subFiles.getName().toLowerCase().contains(".jpg")||
subFiles[i].getName().toLowerCase().contains(".gif")||
subFiles[i].getName().toLowerCase().contains(".png")||
subFiles[i].getName().toLowerCase().contains(".bmp")){
icon = new ImageIcon(subFiles[i].getPath());
scaledImage = Utils.getScaledImage(icon.getImage(), 30, 30);
thumbnailIcon = new ImageIcon(scaledImage);
}else{
icon = (ImageIcon)fsv.getSystemIcon(subFiles[i]);
scaledImage = Utils.getScaledImage(icon.getImage(), 30, 30);
thumbnailIcon = new ImageIcon(scaledImage);
mvtm.addFileRecord(thumbnailIcon, subFiles[i].getName(),
Long.toString(subFiles[i].length()), subFiles[i]);
main.setCursor(null);
The resize method is here:
static Image getScaledImage(Image srcImg, int w, int h){
BufferedImage resizedImg;
resizedImg = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = resizedImg.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2.drawImage(srcImg, 0, 0, w,h, Color.WHITE, null);
g2.dispose();
return resizedImg;
}I have tried to nullify all objects created by overriding the applet destroy method:
public void destroy(){
fileTree.getFileTreeListener().clearMvtm();
addButton = null;
fileTable = null;
jLabel1 = null;
jPanel1 = null;
jPanel2 = null;
jProgressBar1 = null;
jScrollPane1 = null;
jScrollPane2 = null;
jScrollPane3 = null;
messageLabel = null;
removeButton = null;
uploadButton = null;
uploadQueueTable = null;
fileTree = null;
fileModel = null;
uploadQueueModel = null;
task = null;
Runtime r = Runtime.getRuntime();
r.gc();
}Any help is appreciated.
Ryan
Edited by: rthompson2000 on Sep 24, 2008 10:33 AM
Hi SoulTech,
thanks for the response. Interesting point I forgot to mention. On my machine, the JVM launches separately, (ie, I get the little Java icon in my task tray on the bottom right of my PC). When I close the applet pop-up, the java icon is still there, and the java.exe process is still running in Task Manager. After about a minute or two, the Java icon disappears, and Java.exe is no longer a running process (ie. the memory is gone, but this takes a minute or two! I want this to stop immediately).
When I try this in a friends PC, they don't get the JVM icon in their taskbar, and all of the memory is allocated to the ieexplorer.exe process. After they close the applet pop-up window, browsing is very slow since their IEexplorer memory is very high because of the applet.
can you hook up a profiler?
I'm just getting familiar with the Netbeans profiler. I am able to see that all of the memory is being allocated in the leftClick() method I posted above. All of the memory is being hogged mainly by type int[] in sun.awt.image.ImageRepresentation.setPixels() and java.awt.image.DataBufferInt
can you see the vm in the process table?
See my above explanation. The java.exe process seems to die after a minute or two, but I don't think it frees memory when the VM is running inside the browser (as in the case on my friends PC)
are you sure destroy is even getting called?
How can I be sure? You said it didn't need to have anything in it anyways so does it matter?
are you getting errors?
No errors.
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