如何解决小程序中的权限问题？

Question

我的小程序有一个小问题，我收到以下错误。

Exception in thread "AWT-EventQueue-2" java.lang.ExceptionInInitializerError
    at applet.JSGD_Register.jButtonInitActionPerformed(JSGD_Register.java:861)
    at applet.JSGD_Register.access$1(JSGD_Register.java:841)
    at applet.JSGD_Register$2.actionPerformed(JSGD_Register.java:195)
    at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
    at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
    at java.awt.Component.processMouseEvent(Unknown Source)
    at javax.swing.JComponent.processMouseEvent(Unknown Source)
    at java.awt.Component.processEvent(Unknown Source)
    at java.awt.Container.processEvent(Unknown Source)
    at java.awt.Component.dispatchEventImpl(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(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)
Caused by: java.security.AccessControlException: access denied (java.lang.RuntimePermission loadLibrary.jnifplib)
    at java.security.AccessControlContext.checkPermission(Unknown Source)
    at java.security.AccessController.checkPermission(Unknown Source)
    at java.lang.SecurityManager.checkPermission(Unknown Source)
    at java.lang.SecurityManager.checkLink(Unknown Source)
    at java.lang.Runtime.loadLibrary0(Unknown Source)
    at java.lang.System.loadLibrary(Unknown Source)
    at SecuGen.FDxSDK.jni.JFPLib.<clinit>(JFPLib.java:68)
    ... 27 more

为什么会出现这种情况以及如何解决？

Answer 1

首先阅读这个文档 - What Applets Can and Cannot Do? ** 并决定一个小程序允许什么样的代码。正如@AndrewThompson 指出的（see 评论）signed 小程序不具有安全性restrictions，因为它们是digitally signed（签名），这证明它们来自特定受信任的作者未经篡改。

有关已签名小程序的更多信息，请查看：

1. Security in Rich Internet Applications
2. Understanding Signing and Verification