第二次启动时Applet崩溃 - 提供了错误日志

Question

我们有一个应用程序，它在登录页面上启动，然后导航到加载小程序的第二页。一切都很好。当用户注销时，浏览器将导航回登录屏幕。如果用户再次登录，则当applet的一部分被初始化时，浏览器崩溃。这只发生在小程序的第二次加载。缓存在浏览器中被禁用，但浏览器从未完全关闭，所以我认为在第一次登录时加载的小程序仍然存在？

更多信息。加载小程序时，会出现sun java控制台。当用户注销并返回到登录屏幕时，即使登录屏幕不使用java（仅html和javascript），sun java控制台仍处于启动状态。我认为当用户注销时，某些东西没有被重新初始化，但是applet停止并被销毁，所以还有什么东西可以悬挂？
奇怪的是，这只发生在一台测试机器上，而没有发生在其他测试机器上。

下面是从SJC错误日志：

java.lang.NullPointerException 
    at javax.swing.text.html.parser.Parser.errorContext(Unknown Source) 
    at javax.swing.text.html.parser.Parser.parse(Unknown Source) 
    at javax.swing.text.html.parser.DocumentParser.parse(Unknown Source) 
    at javax.swing.text.html.parser.ParserDelegator.parse(Unknown Source) 
    at javax.swing.text.html.HTMLEditorKit.read(Unknown Source) 
    at javax.swing.JEditorPane.setText(Unknown Source) 
    at ReportPane.setDescription(ReportPane.java:577) 
    at ReportPane.doDefineLoad(ReportPane.java:608) 
    at ReportPane.<init>(ReportPane.java:565) 
    at RevApp2.createGui(RevApp2.java:640) 
    at RevApp2.access$0(RevApp2.java:414) 
    at RevApp2$1.run(RevApp2.java:393) 
    at java.awt.event.InvocationEvent.dispatch(Unknown Source) 
    at java.awt.EventQueue.dispatchEvent(Unknown Source) 
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source) 
    at java.awt.EventDispatchThread.run(Unknown Source) 
asDescription-><font face="CENTURY SCHOOLBOOK">Use to assign accounts to coders.</font> 
java.lang.reflect.InvocationTargetException 
    at java.awt.EventQueue.invokeAndWait(Unknown Source) 
    at javax.swing.SwingUtilities.invokeAndWait(Unknown Source) 
    at RevApp2.init(RevApp2.java:389) 
    at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source) 
    at java.lang.Thread.run(Unknown Source) 
Caused by: java.lang.NullPointerException 
    at javax.swing.text.html.parser.Parser.errorContext(Unknown Source) 
    at javax.swing.text.html.parser.Parser.parse(Unknown Source) 
    at javax.swing.text.html.parser.DocumentParser.parse(Unknown Source) 
    at javax.swing.text.html.parser.ParserDelegator.parse(Unknown Source) 
    at javax.swing.text.html.HTMLEditorKit.read(Unknown Source) 
    at javax.swing.JEditorPane.setText(Unknown Source) 
    at AdminPane.setDescription(AdminPane.java:197) 
    at AdminPane.<init>(AdminPane.java:174) 
    at RevApp2.createGui(RevApp2.java:656) 
    at RevApp2.access$0(RevApp2.java:414) 
    at RevApp2$1.run(RevApp2.java:393) 
    at java.awt.event.InvocationEvent.dispatch(Unknown Source) 
    at java.awt.EventQueue.dispatchEvent(Unknown Source) 
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source) 
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source) 
    at java.awt.EventDispatchThread.run(Unknown Source) 
netscape.javascript.JSException: Unspecified error invoking method or accessing property "accountfocus" 
    at sun.plugin2.main.client.MessagePassingJSObject.newJSException(Unknown Source) 
    at sun.plugin2.main.client.MessagePassingJSObject.waitForReply(Unknown Source) 
    at sun.plugin2.main.client.MessagePassingJSObject.call(Unknown Source) 
    at RevApp2.start(RevApp2.java:2045) 
    at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source) 
    at java.lang.Thread.run(Unknown Source) 
Exception: netscape.javascript.JSException: Unspecified error invoking method or accessing property "accountfocus" 

Answer 1

如果谷歌“javax.swing.text.html.parser.Parser.errorContext”你会发现，其他人也有类似的问题，并已上报他们在某些Oracle讨论区：

http://forums.oracle.com/forums/thread.jspa?messageID=8297744&tstart=0

他们谈论解决类似的问题 - 也许这可能适合你的情况也是如此。

Qute从论坛：

我不明白这究竟是 右端游，但是却能逃避 它时，我就是这么做的。 JEdi​​torPane htmlPane = new JEditorPane（“text/html”，html）;这是一个JEditorPane插件。

Answer 2

解决有关此问题可能是以下几点：

editorPane.setEditorKit(new HTMLEditorKit() { 
    protected Parser getParser() { 
    try { 
    Class c = Class 
     .forName("javax.swing.text.html.parser.ParserDelegator"); 
    Parser defaultParser = (Parser) c.newInstance(); 
    return defaultParser; 
    } catch (Throwable e) { 
    } 
    return null; 
    } 
    });