自 Java 7 Update 5 以来，我的 Java Web Start 应用程序正在请求建立连接的权限。该应用程序已使用有效证书签名。
弹出窗口显示以下文本:
The application has requested permission to establish connections to www.example.com. Do you want to allow this action? [OK] [Cancel]
在拒绝请求时，我在控制台上得到了这个跟踪:
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 <0x1d67b050> (a java.lang.Object)
at java.lang.Object.wait(Object.java:503)
at com.sun.javaws.ui.JavawsSysRun.delegate(Unknown Source)
- locked <0x1d67b050> (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 <0x12fd06d0> (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 <0x12fd0728> (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 <0x1d6fcf40> (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 <0x12fd09b8> (a sun.net.www.http.HttpClient)
at sun.net.www.http.HttpClient.<init>(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 <0x12fd0a40> (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$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.deploy.net.CrossDomainXML.check(Unknown Source)
at com.sun.deploy.net.CrossDomainXML.check(Unknown Source)
- locked <0x1d6fcf40> (a java.lang.Class for com.sun.deploy.net.CrossDomainXML)
at com.sun.javaws.security.JavaWebStartSecurity.checkConnect(Unknown Source)
at sun.awt.image.URLImageSource.checkSecurity(Unknown Source)
at sun.awt.image.InputStreamImageSource.setDecoder(Unknown Source)
at sun.awt.image.InputStreamImageSource.doFetch(Unknown Source)
at sun.awt.image.ImageFetcher.fetchloop(Unknown Source)
at sun.awt.image.ImageFetcher.run(Unknown Source)
"AWT-EventQueue-0" prio=6 tid=0x0315f800 nid=0xc80 waiting on condition [0x037cf000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x1d6b46a8> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$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 <0x1db95260> (a java.awt.MediaTracker)
at java.awt.MediaTracker.waitForID(Unknown Source)
- locked <0x1db95260> (a java.awt.MediaTracker)
at javax.swing.ImageIcon.loadImage(Unknown Source)
- locked <0x1db95260> (a java.awt.MediaTracker)
at javax.swing.ImageIcon.<init>(Unknown Source)
at javax.swing.ImageIcon.<init>(Unknown Source)
at com.mycompany.myapp.j.c(Unknown Source)
at com.mycompany.myapp.j.<init>(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 <0x1d6fcf40> (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 <0x1d6b5518> (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 <0x12fd1e58> (a java.awt.EventQueue$1AWTInvocationLock)
at java.lang.Object.wait(Object.java:503)
at java.awt.EventQueue.invokeAndWait(Unknown Source)
- locked <0x12fd1e58> (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 <0x1d67b050> (a java.lang.Object)
该应用程序包含一个从网站获取图像的欢迎屏幕，然后关闭该屏幕并出现主应用程序窗口。警告仅在欢迎屏幕出现之前显示。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 的回归还是新特性？我在 release notes 中没有看到任何对此的引用.
谢谢
最佳答案
我们也遇到了这个问题，再加上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”。我试过了，但是对你的 bug # 7177349 发表了评论，但评论不可用。
关于java - 为什么 Java 7 为已签名的应用程序请求网络权限？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/11050202/
类classAprivatedeffooputs:fooendpublicdefbarputs:barendprivatedefzimputs:zimendprotecteddefdibputs:dibendendA的实例a=A.new测试a.foorescueputs:faila.barrescueputs:faila.zimrescueputs:faila.dibrescueputs:faila.gazrescueputs:fail测试输出failbarfailfailfail.发送测试[:foo,:bar,:zim,:dib,:gaz].each{|m|a.send(m)resc
我有一个模型:classItem项目有一个属性“商店”基于存储的值，我希望Item对象对特定方法具有不同的行为。Rails中是否有针对此的通用设计模式？如果方法中没有大的if-else语句，这是如何干净利落地完成的？ 最佳答案 通常通过Single-TableInheritance. 关于ruby-on-rails-Rails-子类化模型的设计模式是什么？，我们在StackOverflow上找到一个类似的问题： https://stackoverflow.co
对于具有离线功能的智能手机应用程序，我正在为Xml文件创建单向文本同步。我希望我的服务器将增量/差异(例如GNU差异补丁)发送到目标设备。这是计划:Time=0Server:hasversion_1ofXmlfile(~800kiB)Client:hasversion_1ofXmlfile(~800kiB)Time=1Server:hasversion_1andversion_2ofXmlfile(each~800kiB)computesdeltaoftheseversions(=patch)(~10kiB)sendspatchtoClient(~10kiBtransferred)Cl
我正在使用的第三方API的文档状态:"[O]urAPIonlyacceptspaddedBase64encodedstrings."什么是“填充的Base64编码字符串”以及如何在Ruby中生成它们。下面的代码是我第一次尝试创建转换为Base64的JSON格式数据。xa=Base64.encode64(a.to_json) 最佳答案 他们说的padding其实就是Base64本身的一部分。它是末尾的“=”和“==”。Base64将3个字节的数据包编码为4个编码字符。所以如果你的输入数据有长度n和n%3=1=>"=="末尾用于填充n%
我主要使用Ruby来执行此操作，但到目前为止我的攻击计划如下:使用gemsrdf、rdf-rdfa和rdf-microdata或mida来解析给定任何URI的数据。我认为最好映射到像schema.org这样的统一模式，例如使用这个yaml文件，它试图描述数据词汇表和opengraph到schema.org之间的转换:#SchemaXtoschema.orgconversion#data-vocabularyDV:name:namestreet-address:streetAddressregion:addressRegionlocality:addressLocalityphoto:i
为什么4.1%2返回0.0999999999999996？但是4.2%2==0.2。 最佳答案 参见此处:WhatEveryProgrammerShouldKnowAboutFloating-PointArithmetic实数是无限的。计算机使用的位数有限(今天是32位、64位)。因此计算机进行的浮点运算不能代表所有的实数。0.1是这些数字之一。请注意，这不是与Ruby相关的问题，而是与所有编程语言相关的问题，因为它来自计算机表示实数的方式。 关于ruby-为什么4.1%2使用Ruby返
我构建了两个需要相互通信和发送文件的Rails应用程序。例如，一个Rails应用程序会发送请求以查看其他应用程序数据库中的表。然后另一个应用程序将呈现该表的json并将其发回。我还希望一个应用程序将存储在其公共(public)目录中的文本文件发送到另一个应用程序的公共(public)目录。我从来没有做过这样的事情，所以我什至不知道从哪里开始。任何帮助，将不胜感激。谢谢! 最佳答案 无论Rails是什么，几乎所有Web应用程序都有您的要求，大多数现代Web应用程序都需要相互通信。但是有一个小小的理解需要你坚持下去，网站不应直接访问彼此
我尝试运行2.x应用程序。我使用rvm并为此应用程序设置其他版本的ruby:$rvmuseree-1.8.7-head我尝试运行服务器，然后出现很多错误:$script/serverNOTE:Gem.source_indexisdeprecated,useSpecification.Itwillberemovedonorafter2011-11-01.Gem.source_indexcalledfrom/Users/serg/rails_projects_terminal/work_proj/spohelp/config/../vendor/rails/railties/lib/r
刚入门rails，开始慢慢理解。有人可以解释或给我一些关于在application_controller中编码的好处或时间和原因的想法吗？有哪些用例。您如何为Rails应用程序使用应用程序Controller？我不想在那里放太多代码，因为据我了解，每个请求都会调用此Controller。这是真的？ 最佳答案 ApplicationController实际上是您应用程序中的每个其他Controller都将从中继承的类(尽管这不是强制性的)。我同意不要用太多代码弄乱它并保持干净整洁的态度，尽管在某些情况下ApplicationContr
它不等于主线程的binding，这个toplevel作用域是什么？此作用域与主线程中的binding有何不同？>ruby-e'putsTOPLEVEL_BINDING===binding'false 最佳答案 事实是，TOPLEVEL_BINDING始终引用Binding的预定义全局实例，而Kernel#binding创建的新实例>Binding每次封装当前执行上下文。在顶层，它们都包含相同的绑定(bind)，但它们不是同一个对象，您无法使用==或===测试它们的绑定(bind)相等性。putsTOPLEVEL_BINDINGput