小程序中的 java.lang.reflect.invocationtargetexception 错误 [英] java.lang.reflect.invocationtargetexception error in applet
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问题描述
我的应用程序作为应用程序运行时没有错误，但作为小程序会引发以下错误:
My application runs without errors as an application, but as an applet throws the following error:
java.lang.reflect.invocationtargetexception
java.lang.reflect.invocationtargetexception
这是我第一次尝试将我的应用程序用作小程序，所以我可能做错了什么，但这是我的主类:
This is my first time attempting to use my application as an applet, so I may have done something wrong, but here is my main class:
package main;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import javax.swing.JApplet;
import javax.swing.JFrame;
public class MainGame extends JApplet {
private static final long serialVersionUID = 1L;
public static final String NAME = "Physics - Projectile Motion Example";
public static final int HEIGHT = 160;
public static final int WIDTH = HEIGHT * 16 / 9;
public static final int SCALE = 4;
private long reportedFramerate;
long framerate = 1000 / 60;
// time the frame began
long frameStart;
// number of frames counted this second
long frameCount = 0;
// time elapsed during one frame
long elapsedTime;
// accumulates elapsed time over multiple frames
long totalElapsedTime = 0;
// the actual calculated framerate reported
public MainGame() {
run();
}
public void run() {
JFrame frame = new JFrame(MainGame.NAME);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
OptionsPanel options = new OptionsPanel();
GamePanel game = new GamePanel(options);
frame.setSize(new Dimension ( WIDTH * SCALE, HEIGHT * SCALE ));
frame.add(game, BorderLayout.CENTER);
frame.add(options, BorderLayout.SOUTH);
frame.setLocationRelativeTo(null);
frame.setResizable(false);
frame.setVisible(true);
while(true) {
frameStart = System.currentTimeMillis();
if(options.isStartGame() == true) {
game.run();
}
else {
game.reset();
}
// calculate the time it took to render the frame
elapsedTime = System.currentTimeMillis() - frameStart;
// sync the framerate
try {
// make sure framerate milliseconds have passed this frame
if (elapsedTime < framerate) {
Thread.sleep(framerate - elapsedTime);
} else {
// don't starve the garbage collector
Thread.sleep(5);
}
} catch (InterruptedException e) {
break;
}
++frameCount;
totalElapsedTime += (System.currentTimeMillis() - frameStart);
if (totalElapsedTime > 1000) {
reportedFramerate = (long) ((double) frameCount
/ (double) totalElapsedTime * 1000.0);
// show the framerate in the applet status window
//System.out.println("fps: " + reportedFramerate);
// repaint();
frameCount = 0;
totalElapsedTime = 0;
//System.out.println(reportedFramerate);
}
}
}
public void init() {
new MainGame();
}
public void start() {
System.out.println("started");
}
public void stop() {
System.out.println("Stopped");
}
public void destroy() {
}
public static void main(String[] args) {
new MainGame();
}
}
对象的 HTML:
<p>
<object type="application/x-java-applet"
name="physics" width="360" height="320">
<param name="code" value="main.MainGame.class" />
<param name="archive" value="physics.jar" />
<param name="scriptable" value="true" />
<param name="mayscript" value="true" />
<param name="file" value="/report_files/1-1272041330710YAIwK" />
</object>
</p>
示例页面自己查看错误:http://fogest.com/java_example/
Example page to see the error for yourself: http://fogest.com/java_example/
推荐答案
完整的堆栈跟踪是:
Java Plug-in 10.21.2.11
Using JRE version 1.7.0_21-b11 Java HotSpot(TM) Client VM
User home directory = C:\Users\Andrew
----------------------------------------------------
c: clear console window
...
0-5: set trace level to <n>
----------------------------------------------------
Trace level set to 5: all ... completed.security: blacklist: hasBeenModifiedSince 1370282598700 (we have 1366432497929)
security: blacklist: hasBeenModifiedSince 1366432497958 (we have 1366432497929)
network: Created version ID: 1.7.0.21
network: Created version ID: 1.7.0.21
basic: exception: java.lang.reflect.InvocationTargetException.
java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at com.sun.deploy.uitoolkit.impl.awt.AWTAppletAdapter.runOnEDTAndWait(Unknown Source)
at com.sun.deploy.uitoolkit.impl.awt.AWTAppletAdapter.instantiateApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.initAppletAdapter(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.reflect.InvocationTargetException
at com.sun.deploy.uitoolkit.impl.awt.OldPluginAWTUtil.invokeAndWait(Unknown Source)
... 5 more
Caused by: java.security.AccessControlException: access denied ("java.lang.RuntimePermission" "exitVM.0")
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at sun.plugin2.applet.AWTAppletSecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkExit(Unknown Source)
at javax.swing.JFrame.setDefaultCloseOperation(Unknown Source)
at main.MainGame.run(MainGame.java:36)
at main.MainGame.<init>(MainGame.java:31)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at com.sun.deploy.uitoolkit.impl.awt.AWTAppletAdapter$1.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
basic: Removed progress listener: sun.plugin.util.ProgressMonitorAdapter@1f312f0
security: Reset deny session certificate store
security: blacklist: hasBeenModifiedSince 1366740392097 (we have 1366432497929)
security: blacklist: hasBeenModifiedSince 1369035157319 (we have 1366432497929)
network: CleanupThread used 6369043 us
basic: PluginMain.unregisterApplet: 1 from mananger sun.plugin2.applet.Applet2Manager@1823290
network: Checking for update at: https://javadl-esd-secure.oracle.com/update/baseline.version
network: Checking for update at: https://javadl-esd-secure.oracle.com/update/blacklisted.certs
network: Checking for update at: https://javadl-esd-secure.oracle.com/update/blacklist
security: JSS is not configured
network: Connecting https://javadl-esd-secure.oracle.com/update/baseline.version with proxy=DIRECT
network: Connecting https://javadl-esd-secure.oracle.com/update/blacklisted.certs with proxy=DIRECT
network: Connecting https://javadl-esd-secure.oracle.com/update/blacklist with proxy=DIRECT
network: Connecting http://javadl-esd-secure.oracle.com:443/ with proxy=DIRECT
network: Connecting http://javadl-esd-secure.oracle.com:443/ with proxy=DIRECT
network: Connecting http://javadl-esd-secure.oracle.com:443/ with proxy=DIRECT
security: Loading Root CA certificates from C:\Program Files (x86)\Java\jre7\lib\security\cacerts
security: Loaded Root CA certificates from C:\Program Files (x86)\Java\jre7\lib\security\cacerts
security: Loading SSL Root CA certificates from C:\Program Files (x86)\Java\jre7\lib\security\cacerts
security: Loaded SSL Root CA certificates from C:\Program Files (x86)\Java\jre7\lib\security\cacerts
security: Loading certificates from Deployment session certificate store
security: Loaded certificates from Deployment session certificate store
security: Loading certificates from Deployment session certificate store
security: Loaded certificates from Deployment session certificate store
security: Loading certificates from Deployment session certificate store
security: Loaded certificates from Deployment session certificate store
network: Cookie service is not available - use cache to determine "Cookie"
network: Cookie service is not available - use cache to determine "Cookie"
network: Cookie service is not available - use cache to determine "Cookie"
重要的部分是:
Caused by: java.security.AccessControlException: access denied
("java.lang.RuntimePermission" "exitVM.0")
这是由于:
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
即使是受信任的小程序也无法(或至少应该尝试)退出 JVM.
Not even a trusted applet can (or at least should even try) to exit the JVM.
同意 Hovercraft Full Of Eels 的总体主旨，因为这是一个很糟糕的框架，变成了一个小程序.使用 Java Web Start 启动框架.
Agree with the general thrust of Hovercraft Full Of Eels in that this is a frame poorly shoe-horned into being an applet. Launch the frame using Java Web Start.
这篇关于小程序中的 java.lang.reflect.invocationtargetexception 错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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