我正在我的 Windows 7 64 位计算机上运行一个用 swing 制作的图形化 java 应用程序。
我的应用程序是一个可运行的 jar 文件，我使用以下命令从命令提示符启动它:
C:\path\to\jre\java.exe -jar myProg.jar
我的问题是，当我使用 JRE8 32 位时会遇到巨大的性能问题，而在使用 JRE7 32 位或 JRE8 64 位时则不会。
请注意，应用程序是使用相同的 jar 文件运行的；唯一的区别是它由不同的 JRE 运行。
我尝试了不同的 JRE8 版本，但问题仍然存在...
当我在使用“-verbose”参数时比较两个输出时，我发现我得到了超过 1500 个带有文本的输出:'[从共享对象文件加载 xxxxxx]' 对于 JRE7 而我没有得到 JRE8。< br/=""> 也许它可能以某种方式链接？
有人知道问题出在哪里吗？
这是 JRE7 的一些输出
[Loaded MainFrame.MainFrame$XtrFileFilter from rsrc:./]
[Loaded java.awt.event.HierarchyListener from shared objects file]
[Loaded java.lang.InterruptedException from shared objects file]
[Loaded java.io.FileWriter from shared objects file]
[Loaded javax.swing.CellEditor from shared objects file]
[Loaded javax.swing.table.TableCellEditor from shared objects file]
[Loaded java.awt.image.RenderedImage from shared objects file]
[Loaded java.awt.image.WritableRenderedImage from shared objects file]
[Loaded java.awt.image.BufferedImage from shared objects file]
[Loaded sun.awt.util.IdentityArrayList from c:\Program Files (x86)\Java\jdk1.7.0_45\jre\lib\rt.jar]
[Loaded java.awt.Window$Type from c:\Program Files (x86)\Java\jdk1.7.0_45\jre\lib\rt.jar]
[Loaded java.util.concurrent.atomic.AtomicBoolean from shared objects file]
[Loaded sun.awt.AWTAccessor$WindowAccessor from c:\Program Files (x86)\Java\jdk1.7.0_45\jre\lib\rt.jar]
[Loaded java.awt.Window$1 from c:\Program Files (x86)\Java\jdk1.7.0_45\jre\lib\rt.jar]
[Loaded sun.awt.AWTAccessor$FrameAccessor from c:\Program Files (x86)\Java\jdk1.7.0_45\jre\lib\rt.jar]
[Loaded java.awt.Frame$1 from c:\Program Files (x86)\Java\jdk1.7.0_45\jre\lib\rt.jar]
[Loaded java.awt.ComponentOrientation from shared objects file]
[Loaded java.awt.Component$3 from c:\Program Files (x86)\Java\jdk1.7.0_45\jre\lib\rt.jar]
[Loaded javax.swing.ImageIcon from shared objects file]
[Loaded MainFrame.Simulation.Simulation from rsrc:./]
[Loaded MainFrame.Optimization.Optimization from rsrc:./]
[Loaded MainFrame.Convergence.Convergence from rsrc:./]
[Loaded java.awt.event.WindowEvent from shared objects file]
[Loaded MainFrame.Menu from rsrc:./]
这是一些 JRE8 输出
[Loaded MainFrame.MainFrame from rsrc:./]
[Loaded java.util.EventListener from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]
[Loaded java.awt.event.ActionListener from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]
[Loaded javax.swing.Action from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]
[Loaded sun.reflect.NativeMethodAccessorImpl from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]
[Loaded sun.reflect.DelegatingMethodAccessorImpl from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]
[Loaded javax.swing.UIManager from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]
[Loaded javax.swing.UIManager$LookAndFeelInfo from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]
[Loaded sun.awt.OSInfo from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]
[Loaded sun.awt.OSInfo$WindowsVersion from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]
[Loaded sun.awt.OSInfo$1 from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]
[Loaded sun.awt.OSInfo$OSType from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]
[Loaded java.awt.Toolkit from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]
[Loaded sun.awt.AWTAccessor$ToolkitAccessor from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]
[Loaded java.awt.Toolkit$4 from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]
[Loaded sun.awt.AWTAccessor from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]
[Loaded java.awt.Toolkit$5 from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]
[Loaded java.util.ResourceBundle$Control from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]
[Loaded sun.util.CoreResourceBundleControl from c:\Program Files (x86)\Java\jre1.8.0_45\lib\rt.jar]
我为 JRE7 和 JRE8 运行了 Xshare:dump，得到了以下结果:
JRE7:
Loading classes to share ... done.
Rewriting and unlinking classes ... done.
Calculating hash values for String objects .. done.
Calculating fingerprints ... done.
Removing unshareable information ... done.
Moving common symbols to metadata section at 0x3a033570 ... done.
Moving vmSymbols to metadata section at 0x3a1d2170 ... done.
Moving the remaining symbols to metadata section at 0x3a1d3478 ... done.
Moved 44361 symbols, 1703760 bytes.
Moving pre-ordered read-only objects to shared space at 0x38a30000 ... done.
Moving read-only objects to shared space at 0x38e129b0 ... done.
Moving string char arrays to shared space at 0x38e20cd8 ... done.
Moving pre-ordered read-write objects to shared space at 0x39430000 ... done.
Moving read-write objects to shared space at 0x399e8fb0 ... done.
Moving String objects to shared space at 0x39a3e920 ... done.
Read-write space ends at 0x39a7dd28, 6610216 bytes.
Updating references to shared objects ... done.
An error has occurred while processing the shared archive file.
Unable to create shared archive file c:\Program Files (x86)\Java\jdk1.7.0_45\jre\bin\client\classes.jsa.
Error occurred during initialization of VM
Unable to use shared archive.
JRE8:
Allocated shared space: 27394048 bytes at 0x14a00000
Loading classes to share ...
Preload Warning: Cannot find javax/swing/JComponent$2
Preload Warning: Cannot find javax/swing/RepaintManager$1$1
Preload Warning: Cannot find javax/swing/plaf/metal/MetalLookAndFeel$MetalLazyValue
Preload Warning: Cannot find javax/swing/plaf/metal/MetalLookAndFeel$MetalLazyValue$1
Preload Warning: Cannot find javax/swing/text/AbstractDocument$InsertStringResult
Preload Warning: Cannot find sun/awt/windows/WToolkit$3$1
Preload Warning: Cannot find sun/java2d/Disposer$2
Preload Warning: Cannot find sun/java2d/d3d/D3DScreenUpdateManager$1
Preload Warning: Cannot find sun/java2d/d3d/D3DScreenUpdateManager$1$1
Loading classes to share: done.
Rewriting and linking classes ...
Rewriting and linking classes: done
Number of classes 2383
instance classes = 2369
obj array classes = 6
type array classes = 8
Calculating fingerprints ... done.
Removing unshareable information ... done.
Shared Lookup Cache Table Buckets = 4108 bytes
Shared Lookup Cache Table Body = 50352 bytes
ro space: 5650016 [ 47.7% of total] out of 12582912 bytes [44.9% used] at 0x14a00000
rw space: 5396096 [ 45.6% of total] out of 12582912 bytes [42.9% used] at 0x15600000
md space: 753892 [ 6.4% of total] out of 2097152 bytes [35.9% used] at 0x16200000
mc space: 34032 [ 0.3% of total] out of 131072 bytes [26.0% used] at 0x16400000
total : 11834036 [100.0% of total] out of 27394048 bytes [43.2% used]
最佳答案
也许是 Shared Class Data您的安装存档丢失或损坏。
您可以按照 “Regenerating the Shared Archive” 下文档中的建议进行尝试
To regenerate the archive, log in as the administrator; in networked situations, log on to a machine of the same architecture as the Java SE installation and ensure that you have permission to write to the installation directory. Then execute the command
java -Xshare:dumpDiagnostic information will be printed as the archive is generated.
请注意，如果失败，您可以强制使用共享数据来获取错误消息(而不是减速)，如同一页所述:
Manually Controlling Class Data Sharing
The class data sharing feature is automatically enabled when conditions allow it to be used. The following command line options are present primarily for diagnostic and debugging purposes and may change or be removed in future releases.
-Xshare:off- Disable class data sharing.
-Xshare:on- Require class data sharing to be enabled. If it could not be enabled for various reasons, print an error message and exit.
-Xshare:auto- The default; enable class data sharing whenever possible.
关于java - 为什么我的应用程序启动时间超过 2 分钟？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/29774520/
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
我需要在客户计算机上运行Ruby应用程序。通常需要几天才能完成(复制大备份文件)。问题是如果启用sleep，它会中断应用程序。否则，计算机将持续运行数周，直到我下次访问为止。有什么方法可以防止执行期间休眠并让Windows在执行后休眠吗？欢迎任何疯狂的想法;-) 最佳答案 Here建议使用SetThreadExecutionStateWinAPI函数，使应用程序能够通知系统它正在使用中，从而防止系统在应用程序运行时进入休眠状态或关闭显示。像这样的东西:require'Win32API'ES_AWAYMODE_REQUIRED=0x0
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
Rackup通过Rack的默认处理程序成功运行任何Rack应用程序。例如:classRackAppdefcall(environment)['200',{'Content-Type'=>'text/html'},["Helloworld"]]endendrunRackApp.new但是当最后一行更改为使用Rack的内置CGI处理程序时，rackup给出“NoMethodErrorat/undefinedmethod`call'fornil:NilClass”:Rack::Handler::CGI.runRackApp.newRack的其他内置处理程序也提出了同样的反对意见。例如Rack
我想用ruby编写一个小的命令行实用程序并将其作为gem分发。我知道安装后，Guard、Sass和Thor等某些gem可以从命令行自行运行。为了让gem像二进制文件一样可用，我需要在我的gemspec中指定什么。 最佳答案 Gem::Specification.newdo|s|...s.executable='name_of_executable'...endhttp://docs.rubygems.org/read/chapter/20 关于ruby-在Ruby中编写命令行实用程序
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