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本文描述并尝试解决一些与Java有关的问题

本文描述并有助于解决一些与Java有关的问题，如需要有关Java的安装、启用以及更新的信息，参见[[Using the Java plugin with Firefox]]. __TOC__ = Java在Firefox中不工作 = <!-- Starting in Firefox 3.6 you need the new Java plugin included in Java 6 Update 10 or above, for Java to work. See https://bugzilla.mozilla.org/show_bug.cgi?id=539471#c1 ... which links to http://www.java.com/en/download/faq/firefox_newplugin.xml --> 从Firefox 3.6起，您需要使用包含了Java 6 Update 10及以上版本Java插件。如果您正在使用旧版的Java，你需要更新您的Java插件，有关更新的详细内容，参见[http://www.java.com/en/download/faq/firefox_newplugin.xml Why do I need Java 6 Update 10 and above for Firefox 3.6 and later versions?]. =Java程序使文本框中打字出现错乱等问题= <!-- References: https://bugzilla.mozilla.org/show_bug.cgi?id=256763 and http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6408194 --> 有些时候，在浏览过程中运行Java程序会造成在打字时光标行为异常，并由此引发输入的文本在后面显示或者输入混乱。而且您有可能无法将文本复制到剪切板。如果您遇到以上问题，完全退出Firefox（或者重启计算机）然后再次打开Firefox。 <!-- Java Console disabled The JRE (Java Runtime Environment) installer includes a Java Console extension for Firefox (mainly for advanced users) that does not appear in the Add-ons window. The Java Console included with JRE 6.0 and JRE 6 Update 1 is not compatible with Firefox version 2.0.0.1 or later. If JRE 6.0 or JRE 6.0 Update 1 is installed, an "Incompatible Add-ons" dialog appears after you update to Firefox 2.0.0.1 or later versions, with a message that Java Console version 6.0 or 6.0.01 has been disabled. '''Java will still work in Firefox; only the Java Console add-on is disabled'''. You do not need to make any changes if you don't need the Java Console add-on. For more information on this issue, see [http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6506635 Sun's bug report] and [http://forums.mozillazine.org/viewtopic.php?t=532575 this MozillaZine forum topic]. This issue is fixed in JRE 6 Update 2 so make sure you update to the latest version of Java. You will also need to uninstall the earlier Java 6.0 or Java 6.0 Update 1 version, to prevent future incompatibility messages (see [http://forums.mozillazine.org/viewtopic.php?p=2972639#2972639 this MozillaZine forum topic] for more information). --> {for win} = 在Windows Vista系统中使用Java = 旧版本的Java运行环境会造成Firefox进程挂起。为解决这一问题，从[http://www.java.com Java.com]下载最新版本的Java运行环境 (JRE) 并手动安装。 {/for} = 内存占用 = 所有版本的Java都可能占用大量的内存。而且JRE 5比JRE 6占用的内存要多很多。如果您很关心高内存占用的问题，请更新Java到最新版本。 = Java程序造成Firefox进程驻留内存= 当您在运行Java程序之后关闭Firefox，Firefox进程可能会驻留在内存中。当重启Firefox的时候，一个包含如下内容的窗口会弹出 {note}Firefox 正在运行，但已失去响应。要打开新窗口，请先关闭现有的Firefox进程或重启系统 。{/note} 为了解决这一问题，请尝试以下方法： # 在关闭Firefox之前让Java程序完全载入。 # 在关闭Firefox之前推出使用Java程序的页面。例如，在退出Firefox之前单击该页面的后退按钮或访问一个不同的页面。 # 更新到Java的最新版本。 <!-- Java Plug-in for Netscape Navigator should not be used in Microsoft Internet Explorer If you receive the above error message when starting Firefox, the '''user agent string''' has been modified to a Microsoft Internet Explorer string. At start up, the Java plugin depends on the user agent string, and Sun does not support modified user agent strings. To avoid this error message, you must revert to a user agent string that identifies a Mozilla browser. * If you changed the user agent string using the [https://addons.mozilla.org/extensions/moreinfo.php?id=59 User Agent Switcher] extension, you should undo the change. * If you made the change manually: # [[T:aboutconfig]]} # Search for '''useragent''' by typing it into the '''Filter''' field. # [[T:contextmenu]] on each of the three preferences listed below and select {menu Reset} from the context menu. ** {pref general.useragent.extra.firefox} ** {pref general.useragent.locale} ** {pref general.useragent.security} # If they exist, you may also need to reset: ** {pref general.useragent.extra.''productName''} - where ''productName'' can be the name of some third party software (e.g. ''microsoftdotnet''). ** {pref general.useragent.override} Unable to change browser settings - Java Control Panel warning message If you are running on Windows, you may receive the following warning message: <br/> {note}Unable to change browser settings. Please check that Mozilla or Netscape is properly installed on your system and/or you have sufficient permissions to change system settings.{/note} You should disregard this warning if Java is otherwise working. This option is not relevant in this case. The warning message may be caused by: * Selecting '''Mozilla and Netscape''' for tag support in the Advanced settings of the Java Control Panel. * Selecting '''Mozilla 1.1 and later''' in the Java Control Panel browser settings in Java 1.4.2 or earlier. --> {for win} = 即使Java已安装仍提示缺少插件 = 在您成功地在Windows系统中安装了Java之后，您可能会看到缺少插件提示或者在包含Java程序的页面中看到类似拼图的标识。出现这一问题的原因可能为Firefox安装时的注册表项丢失。 解决方法为重新安装新版的Firefox，这样会更新相关注册表项，详情请见 [[Installing Firefox on Windows]]. {/for}