小程序AccessControlException访问被拒绝

Question

我正在尝试引用JLayer。

<applet
code="AppStart.class"
height="480"
width="640"
archive="jl1.0.jar, AnApplet.jar"
</applet>

我一直在控制台上看到这个错误

Exception in thread "pool-1-thread-1" java.security.AccessControlException: 
  access denied ("java.lang.RuntimePermission" "modifyThreadGroup")
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at sun.plugin2.applet.SecurityManagerHelper.checkAccessHelper(Unknown Source)
at sun.plugin2.applet.AWTAppletSecurityManager.checkAccess(Unknown Source)
at java.lang.ThreadGroup.checkAccess(Unknown Source)
at java.lang.Thread.init(Unknown Source)
at java.lang.Thread.<init>(Unknown Source)
at java.util.concurrent.Executors$DefaultThreadFactory.newThread(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.<init>(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.addWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.processWorkerExit(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

有什么帮助吗？

这是我第一次使用引用的jar。我的其他applet运行得很好。

Answer 1

引用的jar未签名，它正在尝试创建线程，这在applet的未签名jar中是不允许的。

签个名。