使用 <object> 的 Java Applet 中的 ClassNotFoundException标签 [英] ClassNotFoundException in Java Applet using <object> tag

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问题描述

我正在尝试使用 <OBJECT> 嵌入 Java Applet标签，这是 XHTML Strict 的做法.

I'm trying to embed a Java Applet using the <OBJECT> tag, which is the XHTML Strict way of doing it.

浏览了很多网站后，我尝试了这个例子这似乎工作得很好:

After browsing lots of sites, I tried this example which seems to work pretty well:

<!--[if !IE]> Firefox and others will use outer object -->
  <object classid="java:Sample2.class" 
          type="application/x-java-applet"
          archive="Sample2.jar" 
          height="300" width="450" >
    <!-- Konqueror browser needs the following param -->
    <param name="archive" value="Sample2.jar" />
  <!--<![endif]-->
    <!-- MSIE (Microsoft Internet Explorer) will use inner object --> 
    <object classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93" 
            codebase="http://java.sun.com/update/1.5.0/jinstall-1_5_0-windows-i586.cab"
            height="300" width="450" > 
      <param name="code" value="Sample2" />
      <param name="archive" value="Sample2.jar" />
      <strong>
        This browser does not have a Java Plug-in.
        <br />
        <a href="http://java.sun.com/products/plugin/downloads/index.html">
          Get the latest Java Plug-in here.
        </a>
      </strong>
    </object> 
  <!--[if !IE]> close outer object -->
  </object>
  <!--<![endif]-->

我下载了 Sample2.jar 并在本地主机上完美运行.

I downloaded that Sample2.jar and works perfectly on localhost.

现在，我将 Sample2.class 替换为我需要使用的(ar.uba.exactas.infovis.ivides.Scatterplot.class)并使用我自己的 JAR 文件(archive="piccolo.jar piccolox.jar netscape.jar scatterplot.jar"):

Now, I replaced Sample2.class for the one I need to use (ar.uba.exactas.infovis.ivides.Scatterplot.class) and using my own JAR files (archive="piccolo.jar piccolox.jar netscape.jar scatterplot.jar"):

<!--[if !IE]> Firefox and others will use outer object -->
<object
    classid="java:ar.uba.exactas.infovis.ivides.Scatterplot.class"
    type="application/x-java-applet"
    archive="piccolo.jar piccolox.jar netscape.jar scatterplot.jar"
    height="300" width="450" >
    <!-- Konqueror browser needs the following param -->
    <param name="archive" value="piccolo.jar piccolox.jar netscape.jar scatterplot.jar" />
<!--<![endif]-->
    <!-- MSIE (Microsoft Internet Explorer) will use inner object -->
    <object classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
                    codebase="http://java.sun.com/update/1.5.0/jinstall-1_5_0-windows-i586.cab"
                    height="300" width="450" >
        <param name="code" value="ar.uba.exactas.infovis.ivides.Scatterplot" />
        <param name="archive" value="piccolo.jar piccolox.jar netscape.jar scatterplot.jar" />
        <strong>
            This browser does not have a Java Plug-in.
            <br />
            <a href="http://java.sun.com/products/plugin/downloads/index.html">
                Get the latest Java Plug-in here.
            </a>
        </strong>
    </object>
<!--[if !IE]> close outer object -->
</object>
<!--<![endif]-->

这样做之后，我开始了这个日志转储:

After doing so, I'm gettin this log dump:

java.lang.ClassNotFoundException: ar.uba.exactas.infovis.ivides.Scatterplot.class
    at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
    at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
    at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed:http://localhost/infovisUBA/2008-2C/tpfinal/bin/ar/uba/exactas/infovis/ivides/Scatterplot/class.class
    at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
    at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
    at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    ... 7 more
Excepción: java.lang.ClassNotFoundException: ar.uba.exactas.infovis.ivides.Scatterplot.class

我看到的唯一区别是我在包中使用了一个类.

The only difference I see is that I'm using a class inside a package.

另外，请注意我确实使用 完成了这项工作.标签，但我无法使用 <OBJECT>.

Also, please note I did make this work using the <APPLET> tag, but I cannot make it with <OBJECT>.

有什么线索吗?

推荐答案

嗯，这很难...

苦苦挣扎了很久，终于发现是Opera本身的问题.我使用的是有这个错误的 alpha 版本.现在效果很好！

Struggled a lot of time but finally found that the problem was Opera itself. I was using an alpha version which had this bug. Now it works great!

这篇关于使用 &lt;object&gt; 的 Java Applet 中的 ClassNotFoundException标签的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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