com.jacob.com.ComFailException:无法共同创建对象

问题描述

我正在使用 jacob 加载系统证书.当我使用 public static void main(String args[]) 运行代码或说简单的 Java 程序时，它工作正常，但是当我尝试使用 Applet 运行代码时，我收到如下错误...

I'm using jacob to load system certificate. Its working fine when I run code using public static void main(String args[]) or say simple Java program but when I try to run code using Applet I'm getting error as follow...

com.jacob.com.ComFailException: Can't co-create object
    at com.jacob.com.Dispatch.createInstanceNative(Native Method)
    at com.jacob.com.Dispatch.<init>(Dispatch.java:99)
    at com.jacob.activeX.ActiveXComponent.<init>(ActiveXComponent.java:58)
    at com.digicorp.root.SystemWrapper$1.run(SystemWrapper.java:23)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.digicorp.root.SystemWrapper.<init>(SystemWrapper.java:19)
    at com.digicorp.applet.DigitalCertificateApplet.ActiveXObject(DigitalCertificateApplet.java:56)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at sun.plugin.javascript.Trampoline.invoke(Unknown Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at sun.plugin.javascript.JSClassLoader.invoke(Unknown Source)
    at sun.plugin2.liveconnect.JavaClass$MethodInfo.invoke(Unknown Source)
    at sun.plugin2.liveconnect.JavaClass$MemberBundle.invoke(Unknown Source)
    at sun.plugin2.liveconnect.JavaClass.invoke0(Unknown Source)
    at sun.plugin2.liveconnect.JavaClass.invoke(Unknown Source)
    at sun.plugin2.main.client.LiveConnectSupport$PerAppletInfo$DefaultInvocationDelegate.invoke(Unknown Source)
    at sun.plugin2.main.client.LiveConnectSupport$PerAppletInfo$3.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.plugin2.main.client.LiveConnectSupport$PerAppletInfo.doObjectOp(Unknown Source)
    at sun.plugin2.main.client.LiveConnectSupport$PerAppletInfo$LiveConnectWorker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

我还使用了 http://netheadaches.wordpress.com/2012/04/22/jacob-cant-co-create-object/ 解决上述问题.它解决了简单的java程序，但在使用applet时相同的代码出错.

I also used http://netheadaches.wordpress.com/2012/04/22/jacob-cant-co-create-object/ to solve above problem. It solved for simple java program but while using applet same code giving error.

在将 jacob 用于小程序时，有什么我必须牢记的特定事项吗?我正在使用 jacob-1.17

Is there any specific things I have to keep in my mind while using jacob for applet. I'm using jacob-1.17

ActiveXComponent comp=new ActiveXComponent("Encryption.LoadCertificate");

并在互联网上的某个地方找到...

and found somewhere on internet...

 activeXObj = (ActiveXComponent)AccessController.doPrivileged(new PrivilegedAction<Object>()
              {
                public Object run()
                {
                  return new ActiveXComponent(SystemWrapper.currentObjName);
                }
              });

推荐答案

您是否查看了 Jacob 附带的小程序示例?下载源和看一看.您可以在以下位置找到它:samples\com\jacob\samples\applet.里面还有一个 readme.txt 文件.它描述了使 jacob 在小程序中运行所涉及的所有步骤.简而言之:

Did you take a look at the applet example coming with Jacob? Download the source and take a look at it. You can find it in:samples\com\jacob\samples\applet. There is also a readme.txt file in there. It describes all the steps involved to make jacob run in an applet. In short:

1. 在 jnlp 文件中指定原生库(使用 nativelib href)
2. 对所有 jar 进行签名(从 Java 1.7.0_17 开始，这已成为必需)
3. 设置权限/使用策略文件

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