java.lang.OutOfMemoryError：Java 堆空间，如何释放内存？
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java.lang.OutOfMemoryError: Java heap space, How can i free memory?
提问by AR89
Here is the error
这是错误
Exception in thread "AWT-EventQueue-0" java.lang.OutOfMemoryError: Java heap space
at com.sun.media.sound.JavaSoundAudioClip.readStream(JavaSoundAudioClip.java:328)
at com.sun.media.sound.JavaSoundAudioClip.loadAudioData(JavaSoundAudioClip.java:307)
at com.sun.media.sound.JavaSoundAudioClip.<init>(JavaSoundAudioClip.java:93)
at sun.applet.AppletAudioClip.createAppletAudioClip(AppletAudioClip.java:108)
at sun.applet.AppletAudioClip.<init>(AppletAudioClip.java:49)
at java.applet.Applet.newAudioClip(Applet.java:279)
at tetris.TetrisAudioPlayer.<init>(TetrisAudioPlayer.java:31)
at tetris.GamePanel.<init>(GamePanel.java:181)
at tetris.TetrisPanelsController.actionPerformed(TetrisPanelsController.java:155)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2028)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2351)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272)
at java.awt.Component.processMouseEvent(Component.java:6375)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
at java.awt.Component.processEvent(Component.java:6140)
at java.awt.Container.processEvent(Container.java:2083)
at java.awt.Component.dispatchEventImpl(Component.java:4737)
at java.awt.Container.dispatchEventImpl(Container.java:2141)
at java.awt.Component.dispatchEvent(Component.java:4565)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4619)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4280)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4210)
at java.awt.Container.dispatchEventImpl(Container.java:2127)
at java.awt.Window.dispatchEventImpl(Window.java:2482)
at java.awt.Component.dispatchEvent(Component.java:4565)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:684)
at java.awt.EventQueue.accessimport java.applet.*;
import javax.swing.*;
import java.net.*;
public class TetrisAudioPlayer extends JApplet {
private AudioClip song; // Sound player
private URL songPath; // Sound path
private boolean playing;
public TetrisAudioPlayer(String filename) {
try {
//songPath = new URL(getCodeBase(),filename); // Get the Sound URL
songPath= this.getClass().getResource(filename);
song = Applet.newAudioClip(songPath); // Load the Sound
}
catch(Exception e){} // Satisfy the catch
}
public void playSound() {
song.loop(); // Play
playing=true;
}
public void stopSound() {
song.stop(); // Stop
playing=false;
}
public void playSoundOnce() {
song.play(); // Play only once
playing=true;
}
public boolean playing(){
return playing;
}
}
0(EventQueue.java:85)
at java.awt.EventQueue.run(EventQueue.java:643)
at java.awt.EventQueue.run(EventQueue.java:641)
Description of the problem: in the same frame I switch between JPanels, one of them has an Audioclip, if I switch back and forth between this JPanel and another I get this error. I want to free the memory from the JPanel with the Audioclip when I quit it, but seems that assigning null to it doesn't work, any idea? PS The AudioClip class extends JApplet, maybe it is the cause of the problem?
问题描述：在同一帧中，我在 JPanel 之间切换，其中一个具有 Audioclip，如果我在此 JPanel 和另一个之间来回切换，则会出现此错误。我想在退出时使用 Audioclip 从 JPanel 中释放内存，但似乎为它分配 null 不起作用，知道吗？PS AudioClip 类扩展了 JApplet，也许这是问题的原因？
As requested here is the portion of code that "leaks": This is the AudioClip
根据这里的要求是“泄漏”的代码部分：这是 AudioClip
tetrisFrame.getContentPane().removeAll();
tetrisFrame.getContentPane().invalidate();
gamePanel=null;
mainMenuPanel= new MainMenuPanel(this);
tetrisFrame.getContentPane().add(mainMenuPanel);
tetrisFrame.getContentPane().validate();
tetrisFrame.getContentPane().repaint();
And this is how I change the JPanels, gamePanel is the JPanel wich contains the AudioClip, the error occur only with the AudioClip, without it there is no problem with this code.
这就是我更改 JPanel 的方式，gamePanel 是包含 AudioClip 的 JPanel，错误仅发生在 AudioClip 上，没有它，这段代码就没有问题。
-Xms512m
-Xmx1024m
Java -Xmx1024m ......
回答by Siva Charan
Have you tried by setting the JVM arguments with
1. -Xmsas the initial size of the heap
2. -Xmxwhich sets the maximum size of the heap
您是否尝试过将 JVM 参数设置为
1.-Xms作为堆的初始大小
2.-Xmx设置堆的最大大小
Increase the heap value based on your RAM
根据您的 RAM 增加堆值
Example:
例子：
Runtime.getRuntime().runFinalization();
Runtime.getRuntime().gc();
System.gc();
回答by JHS
回答by Yogesh Rathi
Call below method in onDestroy() or onPause()
在 onDestroy() 或 onPause() 中调用以下方法
public void freememory(){
Runtime basurero = Runtime.getRuntime();
basurero.gc();
}
But java internally call System.gc() method this is not correct way to free memory , but using above code memory was clear
但是java内部调用System.gc()方法这不是释放内存的正确方法，但是使用上面的代码内存很清楚
回答by emg
How to free memory in java:
java中如何释放内存：
##代码##Call this twice to get better results.
调用两次以获得更好的结果。
