Вы можете попробовать объединить эти два источника.
MemoryRecoveryTest.java
Делает попытки оправиться от OutOfMemoryError.
/*License - LGPL
<h3>Recovery from an OutOfMemory Error</h3>
<p>The JavaDocs for Error state, in the first sentence..
<blockquote>"An Error is a subclass of Throwable that indicates
serious problems that a reasonable application should
not try to catch."</blockquote>
<p>This advice has led to the fallacy that an OutOfMemoryError
should not be caught and dealt with.But this demo. shows
that it is quite easy to recover to the point of providing
the user with meaningful information, and advice on how to
proceed.
<p>I aim to make my applications 'unreasonable'.;-)
*/
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JProgressBar;
import javax.swing.JOptionPane;
import javax.swing.JDialog;
import javax.swing.Timer;
import javax.swing.border.EmptyBorder;
import java.util.ArrayList;
/** A demo. showing recovery from an OutOfMemoryError.
Our options once an OOME is encountered are relatively
few, but we can still warn the end user and provide
advice on how to correct the problem.
@author Andrew Thompson */
public class MemoryRecoveryTest {
public static void main(String[] args) {
// reserve a buffer of memory
byte[] buffer = new byte[2^10];
ArrayList<Object> list = new ArrayList<Object>();
final JProgressBar memory = new JProgressBar(
0,
(int)Runtime.getRuntime().totalMemory());
ActionListener listener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent ae) {
memory.setValue(
(int)Runtime.getRuntime().freeMemory() );
}
};
Timer timer = new Timer(500, listener);
timer.start();
JDialog dialog = new JDialog();
dialog.setTitle("Available Memory");
JPanel memoryPanel = new JPanel();
memoryPanel.add(memory);
memoryPanel.setBorder(new EmptyBorder(25,25,25,25));
dialog.add( memoryPanel );
dialog.pack();
dialog.setLocationRelativeTo(null);
dialog.setVisible(true);
dialog.addWindowListener( new WindowAdapter(){
@Override
public void windowClosing(WindowEvent we) {
System.exit(0);
}
} );
// prepare a memory warning panel in advance
JPanel memoryWarning = new JPanel();
memoryWarning.add( new JLabel(
"<HTML><BODY>There is not enough memory to" +
" complete the task!<BR> Use a variant " +
" of the application that assigns more memory.") );
try {
// do our 'memory intensive' task
while(true) {
list.add( new Object() );
}
} catch(OutOfMemoryError oome) {
// provide the VM with some memory 'breathing space'
// by clearing the buffer
buffer = null;
// tell the user what went wrong, and how to fix it
JOptionPane.showMessageDialog(
dialog,
memoryWarning,
"Out of Memory!",
JOptionPane.ERROR_MESSAGE);
}
}
}
IWantToBeBig.java
Гарантирует, что Process запущен с указанным объемом памяти.
import java.awt.EventQueue;
import javax.swing.JOptionPane;
import java.io.File;
class IWantToBeBig {
public static void main(String[] args) throws Exception {
if (args.length==0) {
ProcessBuilder pb = new ProcessBuilder(
"java",
"-jar",
"-Xmx512m",
"big.jar",
"anArgument"
);
pb.directory(new File("."));
Process process = pb.start();
process.waitFor();
System.out.println("Exit value: " + process.exitValue());
} else {
Runnable r = new Runnable() {
public void run() {
JOptionPane.showMessageDialog(
null,
"Max Memory: " +
Runtime.getRuntime().maxMemory() +
" bytes.");
}
};
EventQueue.invokeLater(r);
}
}
}