Java RMI教程 - AccessControlException：拒绝访问（java.io.FilePermission [英] Java RMI Tutorial - AccessControlException: access denied (java.io.FilePermission
问题描述
昨天我试着开始使用Java RMI。我找到了这个sun教程（ http://java.sun.com/docs /books/tutorial/rmi/index.html ）并从服务器实现开始。但每次我开始计划（rmiregistry正在运行）我得到一个带有以下StackTrace的AccessControlException：
Yesterday I tried to get started with Java RMI. I found this sun tutorial (http://java.sun.com/docs/books/tutorial/rmi/index.html) and started with the server implemantation. But everytime I start the pogram (the rmiregistry is running) I get an AccessControlException with the following StackTrace:
LoginImpl exception:
java.security.AccessControlException: access denied (java.io.FilePermission \\\C\ProjX\server\serverProj\bin\usermanager read)
at java.security.AccessControlContext.checkPermission(AccessControlContext.java:264)
at java.security.AccessController.checkPermission(AccessController.java:427)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
at java.lang.SecurityManager.checkRead(SecurityManager.java:871)
at java.io.File.exists(File.java:700)
at sun.net.www.protocol.file.Handler.openConnection(Handler.java:80)
at sun.net.www.protocol.file.Handler.openConnection(Handler.java:55)
at java.net.URL.openConnection(URL.java:943)
at sun.rmi.server.LoaderHandler.addPermissionsForURLs(LoaderHandler.java:1020)
at sun.rmi.server.LoaderHandler.access$300(LoaderHandler.java:52)
at sun.rmi.server.LoaderHandler$Loader.<init>(LoaderHandler.java:1108)
at sun.rmi.server.LoaderHandler$Loader.<init>(LoaderHandler.java:1089)
at sun.rmi.server.LoaderHandler$1.run(LoaderHandler.java:861)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.server.LoaderHandler.lookupLoader(LoaderHandler.java:858)
at sun.rmi.server.LoaderHandler.loadProxyClass(LoaderHandler.java:541)
at java.rmi.server.RMIClassLoader$2.loadProxyClass(RMIClassLoader.java:628)
at java.rmi.server.RMIClassLoader.loadProxyClass(RMIClassLoader.java:294)
at sun.rmi.server.MarshalInputStream.resolveProxyClass(MarshalInputStream.java:238)
at java.io.ObjectInputStream.readProxyDesc(ObjectInputStream.java:1494)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1457)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1693)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:339)
at sun.rmi.registry.RegistryImpl_Skel.dispatch(Unknown Source)
at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:375)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:240)
at sun.rmi.transport.Transport$1.run(Transport.java:153)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:149)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
at java.lang.Thread.run(Thread.java:595)
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(Unknown Source)
at sun.rmi.transport.StreamRemoteCall.executeCall(Unknown Source)
at sun.rmi.server.UnicastRef.invoke(Unknown Source)
at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source)
at startserver.StartServer.main(StartServer.java:22)
我的服务器.policy文件如下所示：
My server.policy file looks like this:
grant {
permission java.security.AllPermission;
};
但我也试过这个......
But I´ve also tried this one ...
grant {
permission java.security.AllPermission;
permission java.io.FilePermission "file://C:/ProjX/server/serverProj/bin/usermanager", "read";
};
...和这一个（以及其他几个： - （）：
... and this one (and several others :-():
grant codeBase "file:///-" {
permission java.security.AllPermission;
};
但是在每种情况下结果都是一样的。是的，策略文件在路径中（我看到Parse异常） ，当我把错误的陈述写入政策文件时。）我尝试了其他几个/和\星座，但它没有效果。
But in every case the result is the same. And yes, the policy file is in path (I see a Parse Exception, when I write wrong statments into the policy-file). I tried out several other "/" and "\" constellations but it has no effect.
我用Eclipse和我的VM-Parameters是这样的：
I use Eclipse and my VM-Parameters are like this:
-cp C:\ProjX\server\serverProj\bin\usermanager\
-Djava.rmi.server.codebase=file://C:/ProjX/server/serverProj/bin/usermanager/
-Djava.rmi.server.hostname=XYZ (anonymized)
-Djava.security.policy=server.policy
编译后的远程接口接口实现类（LoginImpl）类在此路径中：C：/ ProjX / server / serverProj / bin / usermanager /。m ain方法，我将存根实例化并重新绑定到注册表是在另一个包中，如下所示：
The compiled Remote-Interface and the interface-implementation class (LoginImpl) classes are in this path: "C:/ProjX/server/serverProj/bin/usermanager/". The main method, where I instanciate and rebind the stub to the registry is in another package and looks like this:
public static void main(String[] args) {
if (System.getSecurityManager() == null) {
System.setSecurityManager(new SecurityManager());
}
try {
String name = "Login";
Login login = new LoginImpl();
Login stub = (Login) UnicastRemoteObject.exportObject(login, 0);
Registry registry = LocateRegistry.getRegistry();
registry.rebind(name, stub);
System.out.println("LoginImpl bound");
} catch (Exception e) {
System.err.println("LoginImpl exception:");
e.printStackTrace();
}
}
有人对我有建议吗？谢谢你的帮助。
Does anybody have an advice for me? Thank you for help.
所以问题是一样的（java.rmi.UnmarshalException表明改变代码库是不是我的AccessControlException的解决方案）。不，我不想买插件G B; - ）。
So the question is the same (the java.rmi.UnmarshalException shows that changing the codebase is not the solution of my AccessControlException). And no: I don´t want to buy a plugin "G B" ;-).
推荐答案
好的，我有。这不是一个rmiregistry属性（没有任何参数）。我的代码库VM-Parameter中有两个错误：
Ok, I have it. It wasn´t the rmiregistry property (works without any parameters). There were two errors in my codebase VM-Parameter:
-cp C:\ProjX\server\serverProj\bin\usermanager\
-Djava.rmi.server.codebase=file://C:/ProjX/server/serverProj/bin/usermanager/
-Djava.rmi.server.hostname=XYZ (anonymized)
-Djava.security.policy=server.policy
...应该而是看起来像这样：
... should instead look like this:
-Djava.rmi.server.codebase=file:/C:/ProjX/server/serverProj/bin/
-Djava.rmi.server.hostname=XYZ (anonymized)
-Djava.security.policy=server.policy
=>文件：/（只有一个斜线）+错误的包裹结束。
=> file:/ (only one slash) + wrong package ending.
但是跟踪是如此令人困惑，我的首先想到的是，策略文件或策略配置一定是错误的。
But the trace was so confusing, my first thought was, that somthing must be wrong with the policy-file or policy-configuration.
尽管如此：感谢您的帮助和快乐的黑客攻击。 ; - ）
Nevertheless: Thank you for help and happy hacking. ;-)
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