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小程序在第二次启动时崩溃-提供了错误日志

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Elliott · 技术社区 · 15 年前

我们有一个应用程序,它从一个登录页面开始,然后导航到加载小程序的第二个页面。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,当小程序的部分初始化时浏览器将崩溃。这只在第二次加载小程序时发生。浏览器中的缓存已被禁用,但浏览器从未完全关闭,所以我是否可以假定第一次登录时加载的小程序仍然存在?

更多信息。加载小程序时将显示sun java控制台。当用户注销并返回登录屏幕时,即使登录屏幕不使用java(仅使用html和javascript),sunjava控制台仍处于启动状态。我认为当用户注销时,有些东西没有被重新初始化,但是applet被停止并销毁了,所以还有什么可以继续存在?
奇怪的是,这种情况只发生在一台测试机上,而不发生在其他测试机上。

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"

2 回复 | 直到 15 年前

Knubo 15 年前

如果你搜索“javax.swing.text.html.parser.parser.errorContext”,你会发现其他人也有类似的问题,并在一些oracle讨论板上报告了这些问题:

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

他们在讨论解决这个问题的办法——也许这也适合你的情况。

论坛问答:

我不知道是不是右端跑动,但能躲开当我这样做的时候。

JEditorPane(“文本/html”,html);

Hayk 15 年前

  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;
   }
  });