为什么Java 7请求签名应用程序的网络权限？
从Java 7 Update 5开始，我的Java Web Start应用程序正在请求建立连接的权限。 该应用程序使用有效证书进行签名。
将显示一个弹出窗口，其中包含以下文本：
该应用程序已请求与www.example.com建立连接的权限。 你想允许这个动作吗？ [确定] [取消]
在拒绝请求时，我在控制台上获得此跟踪：
Uncaught error fetching image: java.lang.SecurityException at java.lang.SecurityManager.checkPermission(Unknown Source) at java.lang.SecurityManager.checkConnect(Unknown Source) at com.sun.javaws.security.JavaWebStartSecurity.checkConnect(Unknown Source) at sun.awt.image.URLImageSource.checkSecurity(Unknown Source) at sun.awt.image.ImageRepresentation.imageComplete(Unknown Source) at sun.awt.image.InputStreamImageSource.errorConsumer(Unknown Source) at sun.awt.image.InputStreamImageSource.setDecoder(Unknown Source) at sun.awt.image.InputStreamImageSource.doFetch(Unknown Source) at sun.awt.image.ImageFetcher.fetchloop(Unknown Source) at sun.awt.image.ImageFetcher.run(Unknown Source) 这是请求权限时的线程转储：
"Image Fetcher 2" daemon prio=8 tid=0x04198000 nid=0xc24 in Object.wait() [0x0470e000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on (a java.lang.Object) at java.lang.Object.wait(Object.java:503) at com.sun.javaws.ui.JavawsSysRun.delegate(Unknown Source) - locked (a java.lang.Object) at com.sun.deploy.util.DeploySysRun.execute(Unknown Source) at com.sun.deploy.util.DeploySysRun$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at com.sun.deploy.util.DeploySysRun.executePrivileged(Unknown Source) at com.sun.deploy.ui.UIFactory.showApiDialog(Unknown Source) at com.sun.deploy.uitoolkit.impl.awt.ui.UIFactoryImpl.showMessageDialog(Unknown Source) at com.sun.deploy.uitoolkit.impl.awt.ui.UIFactoryImpl.showMessageDialog(Unknown Source) at com.sun.jnlp.ApiDialog.askUser(Unknown Source) at com.sun.jnlp.ApiDialog.askUser(Unknown Source) at com.sun.jnlp.ApiDialog.askConnect(Unknown Source) at com.sun.javaws.security.JavaWebStartSecurity.checkConnect(Unknown Source) at java.net.InetAddress.getAllByName0(Unknown Source) at java.net.InetAddress.getAllByName(Unknown Source) at java.net.InetAddress.getByName(Unknown Source) at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at com.sun.deploy.cache.Cache.getCurrentIP(Unknown Source) at com.sun.deploy.cache.Cache.isCacheEntryIPValid(Unknown Source) at com.sun.deploy.cache.Cache.getCacheEntryFromIdxFiles(Unknown Source) at com.sun.deploy.cache.Cache.getCacheEntry(Unknown Source) at com.sun.deploy.cache.Cache.getCacheEntry(Unknown Source) at com.sun.deploy.cache.Cache.getCacheEntry(Unknown Source) at com.sun.deploy.net.DownloadEngine.isUpdateAvailable(Unknown Source) at com.sun.deploy.cache.DeployCacheHandler.get(Unknown Source) - locked (a java.lang.Object) at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.followRedirect(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) - locked (a sun.net.www.protocol.http.HttpURLConnection) at com.sun.deploy.net.CrossDomainXML.check(Unknown Source) at com.sun.deploy.net.CrossDomainXML.check(Unknown Source) - locked (a java.lang.Class for com.sun.deploy.net.CrossDomainXML) at com.sun.javaws.security.JavaWebStartSecurity.checkConnect(Unknown Source) at sun.net.www.http.HttpClient.openServer(Unknown Source) - locked (a sun.net.www.http.HttpClient) at sun.net.www.http.HttpClient.(Unknown Source) at sun.net.www.http.HttpClient.New(Unknown Source) at sun.net.www.http.HttpClient.New(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) - locked (a sun.net.www.protocol.http.HttpURLConnection) at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startEntity(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startDTDEntity(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.setInputSource(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.dispatch(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl.parse(Unknown Source) at javax.xml.parsers.SAXParser.parse(Unknown Source) at com.sun.deploy.net.CrossDomainXML$2.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at com.sun.deploy.net.CrossDomainXML.check(Unknown Source) at com.sun.deploy.net.CrossDomainXML.check(Unknown Source) - locked (a java.lang.Class for com.sun.deploy.net.CrossDomainXML) at com.sun.javaws.security.JavaWebStartSecurity.checkConnect(Unknown Source) at sun.awt.image.URLImageSource.checkSecurity(Unknown Source) at sun.awt.image.InputStreamImageSource.setDecoder(Unknown Source) at sun.awt.image.InputStreamImageSource.doFetch(Unknown Source) at sun.awt.image.ImageFetcher.fetchloop(Unknown Source) at sun.awt.image.ImageFetcher.run(Unknown Source) "AWT-EventQueue-0" prio=6 tid=0x0315f800 nid=0xc80 waiting on condition [0x037cf000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park(Unknown Source) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source) at java.awt.EventQueue.getNextEvent(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) "javawsApplicationMain" prio=6 tid=0x040b4c00 nid=0x1198 in Object.wait() [0x0461f000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on (a java.awt.MediaTracker) at java.awt.MediaTracker.waitForID(Unknown Source) - locked (a java.awt.MediaTracker) at javax.swing.ImageIcon.loadImage(Unknown Source) - locked (a java.awt.MediaTracker) at javax.swing.ImageIcon.(Unknown Source) at javax.swing.ImageIcon.(Unknown Source) at com.mycompany.myapp.jc(Unknown Source) at com.mycompany.myapp.j.(Unknown Source) at com.mycompany.myapp.MainClass.main(Unknown Source) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at com.sun.javaws.Launcher.executeApplication(Unknown Source) at com.sun.javaws.Launcher.executeMainClass(Unknown Source) at com.sun.javaws.Launcher.doLaunchApp(Unknown Source) at com.sun.javaws.Launcher.run(Unknown Source) at java.lang.Thread.run(Unknown Source) "CacheCleanUpThread" daemon prio=6 tid=0x03232800 nid=0x1048 waiting for monitor entry [0x0390f000] java.lang.Thread.State: BLOCKED (on object monitor) at com.sun.deploy.net.CrossDomainXML.quickCheck(Unknown Source) - waiting to lock (a java.lang.Class for com.sun.deploy.net.CrossDomainXML) at com.sun.javaws.security.JavaWebStartSecurity.checkConnect(Unknown Source) at java.net.InetAddress.getAllByName0(Unknown Source) at java.net.InetAddress.getAllByName(Unknown Source) at java.net.InetAddress.getByName(Unknown Source) at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at com.sun.deploy.cache.Cache.getCurrentIP(Unknown Source) at com.sun.deploy.cache.Cache.isCacheEntryIPValid(Unknown Source) at com.sun.deploy.cache.Cache.getCacheEntryFromFile(Unknown Source) at com.sun.deploy.cache.Cache.getCacheEntryFromFile(Unknown Source) at com.sun.deploy.cache.CleanupThread.getCurrentCacheSize(Unknown Source) at com.sun.deploy.cache.CleanupThread.run(Unknown Source) - locked (a java.lang.Object) "Javaws Secure Thread" daemon prio=6 tid=0x03158c00 nid=0xb9c in Object.wait() [0x0377f000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on (a java.awt.EventQueue$1AWTInvocationLock) at java.lang.Object.wait(Object.java:503) at java.awt.EventQueue.invokeAndWait(Unknown Source) - locked (a java.awt.EventQueue$1AWTInvocationLock) at javax.swing.SwingUtilities.invokeAndWait(Unknown Source) at com.sun.deploy.ui.DialogTemplate.setVisible(Unknown Source) at com.sun.deploy.ui.UIFactory$10.execute(Unknown Source) at com.sun.javaws.ui.JavawsSysRun$SecureThread.doWork(Unknown Source) at com.sun.javaws.ui.JavawsSysRun$SecureThread.run(Unknown Source) - locked (a java.lang.Object)
该应用程序包含一个欢迎屏幕，用于从网站获取图像，然后关闭此屏幕并显示主应用程序窗口。 仅在欢迎屏幕出现之前显示警告。 应用程序启动后，尽管应用程序启动了多个连接，但不会显示其他警告。
是什么导致了这个问题？ 这是Java 7u5中的回归还是新function？ 我在发行说明中没有看到任何对此的引用。
谢谢
我们遇到这个问题以及安全弹出窗口有时会导致死锁。 （由于其他webstart错误）。 这很可能是由于发行说明中7u5中7177094的“修复”造成的。 我试过但你对你的bug＃7177349的评论，但对它的评论不可用。