访问控制异常

Question

我试图在NetBeans 7.3.1 Java项目中执行服务器，但是得到了以下信息：

    Sun Mar 26 15:48:04 EEST 2017 : DRDA_SecurityInstalled.I
Sun Mar 26 15:48:04 EEST 2017 : access denied ("java.net.SocketPermission" "localhost:1527" "listen,resolve")
java.security.AccessControlException: access denied ("java.net.SocketPermission" "localhost:1527" "listen,resolve")
    at java.security.AccessControlContext.checkPermission(AccessControlContext.java:472)
    at java.security.AccessController.checkPermission(AccessController.java:884)
    at java.lang.SecurityManager.checkPermission(SecurityManager.java:549)
    at java.lang.SecurityManager.checkListen(SecurityManager.java:1131)
    at java.net.ServerSocket.bind(ServerSocket.java:374)
    at java.net.ServerSocket.<init>(ServerSocket.java:237)
    at javax.net.DefaultServerSocketFactory.createServerSocket(ServerSocketFactory.java:231)
    at org.apache.derby.impl.drda.NetworkServerControlImpl.createServerSocket(Unknown Source)
    at org.apache.derby.impl.drda.NetworkServerControlImpl.access$000(Unknown Source)
    at org.apache.derby.impl.drda.NetworkServerControlImpl$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at org.apache.derby.impl.drda.NetworkServerControlImpl.blockingStart(Unknown Source)
    at org.apache.derby.impl.drda.NetworkServerControlImpl.executeWork(Unknown Source)
    at org.apache.derby.drda.NetworkServerControl.main(Unknown Source)

我一直在寻找解决方案，但发现了一个-更改java.policy文件中的java.policy 。 好吧，我做到了：

// Standard extensions get all permissions by default


grant codeBase "file:${{java.home}}/*" { permission java.security.AllPermission;
};

// default permissions granted to all domains

grant {
        // Allows any thread to stop itself using the java.lang.Thread.stop()
        // method that takes no argument.
        // Note that this permission is granted by default only to remain
        // backwards compatible.
        // It is strongly recommended that you either remove this permission
        // from this policy file or further restrict it to code sources
        // that you specify, because Thread.stop() is potentially unsafe.
        // See the API specification of java.lang.Thread.stop() for more
        // information.
        permission java.lang.RuntimePermission "stopThread";

        // allows anyone to listen on dynamic ports
        permission java.net.SocketPermission "localhost:0", "listen";

        // "standard" properies that can be read by anyone

        permission java.util.PropertyPermission "java.version", "read";
        permission java.util.PropertyPermission "java.vendor", "read";
        permission java.util.PropertyPermission "java.vendor.url", "read";
        permission java.util.PropertyPermission "java.class.version", "read";
        permission java.util.PropertyPermission "os.name", "read";
        permission java.util.PropertyPermission "os.version", "read";
        permission java.util.PropertyPermission "os.arch", "read";
        permission java.util.PropertyPermission "file.separator", "read";
        permission java.util.PropertyPermission "path.separator", "read";
        permission java.util.PropertyPermission "line.separator", "read";

        permission java.util.PropertyPermission "java.specification.version", "read";
        permission java.util.PropertyPermission "java.specification.vendor", "read";
        permission java.util.PropertyPermission "java.specification.name", "read";

        permission java.util.PropertyPermission "java.vm.specification.version", "read";
        permission java.util.PropertyPermission "java.vm.specification.vendor", "read";
        permission java.util.PropertyPermission "java.vm.specification.name", "read";
        permission java.util.PropertyPermission "java.vm.version", "read";
        permission java.util.PropertyPermission "java.vm.vendor", "read";
        permission java.util.PropertyPermission "java.vm.name", "read";
 permission java.net.SocketPermission "localhost:1527", "listen";// here I added this string that should resolve this problem
};

经过这些步骤后，我尝试推送服务器，但仍然抛出异常。 也许我做错了什么？

Answer 1

发现了一些可能有用的东西。

1. 采用 ：
   

2. 如果系统上存在多个JRE，请确保您正在修改正确的策略文件。要验证此用法，请执行以下操作：
   

   System.out.println(System.getProperty(“java.home”));
   
   然后更改：
   

   {Above path}\\lib\\security\\java.policy