Question

我开发了一个使用Java扩展机制安装扩展包的applet。两个JAR都已签名，我已将其放入清单中：

Permissions: all-permissions
Codebase: *
Application-Library-Allowable-Codebase: *
Caller-Allowable-Codebase: *

它适用于JRE 1.7更新45，但是使用最后一个版本的JRE（1.7更新51），我收到以下错误：

java.lang.NullPointerException
    at com.sun.deploy.security.DeployManifestChecker.verifyCodebase(Unknown Source)
    at com.sun.deploy.security.DeployManifestChecker.verifyApplicationLibraryAllowableCodebase(Unknown Source)
    at com.sun.deploy.security.DeployManifestChecker.verify(Unknown Source)
    at com.sun.deploy.security.DeployManifestChecker.verify(Unknown Source)
    at com.sun.deploy.security.TrustDecider.isAllPermissionGranted(Unknown Source)
    at sun.plugin.extension.ExtensionInstallationImpl.verifyJar(Unknown Source)
    at sun.plugin.extension.ExtensionInstallationImpl.access$100(Unknown Source)
    at sun.plugin.extension.ExtensionInstallationImpl$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.plugin.extension.ExtensionInstallationImpl.installExtension(Unknown Source)
    at sun.misc.ExtensionDependency.installExtension(Unknown Source)
    at sun.misc.ExtensionDependency.checkExtension(Unknown Source)
    at sun.misc.ExtensionDependency.checkExtensions(Unknown Source)
    at sun.misc.ExtensionDependency.checkExtensionsDependencies(Unknown Source)
    at com.sun.deploy.security.DeployURLClassPath$JarLoader.parseExtensionsDependencies(Unknown Source)
    at com.sun.deploy.security.DeployURLClassPath$JarLoader.getClassPath(Unknown Source)
    at com.sun.deploy.security.DeployURLClassPath.getLoader(Unknown Source)
    at com.sun.deploy.security.DeployURLClassPath.getResource(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.plugin2.applet.Plugin2ClassLoader.findClassHelper(Unknown Source)
    at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
    at sun.plugin2.applet.Plugin2Manager.initAppletAdapter(Unknown Source)
    at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

如果我将包扩展名复制到JRE的lib / ext目录中，则applet可以正常工作。我已经阅读了the changes in the new JRE，但我怎么能让它发挥作用？

JRE 7更新51和扩展机制

0 个答案: