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Help on remote connection error

 
Rudy Yeung
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Grateful if someone can help me out with your expertise on networking coz' I have not figured out what is the cause of the problem though I have already set teh RMI Security Manager. I guess something has been missing which I am not aware of.
When I try instantiating a data class from within the RemoteRequest implementation class for the remote server, I get the following error:
c:\src\assign\scjd\starting> java server.FBNServer
suncertify\db\db.db
Exception in thread "main" java.securoty.AccessControlException: access denied (java.io.FilePermission suncertify\db\db.db write)
at java.security.AccessControlContext.checkPermsssion (Unknown Source)
at java.security.AccessController.checkPermsssion (Unknown Source)
at java.lang.SecurityManager.checkPermission (Unknown Source)
at java.lang.SecurityManager.checkWrite (Unknown Source)
at java.io.File.canWrite(Unknown Source))
at suncertify.db.Data.<init> (Data.java:40)
at server.RemoteRequestImpl.<init> (RemoteRequestImpl.java:17)
at server.FBNServer.main (FBNServer.java:23)


 
Debajyoti Pathak
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Rudy,
since you are using a security manager you need to use a policy file wherin you have to specify read write permission for files.
Deb
 
Rahul Rathore
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Rudy,
As Debajyoti says a policy file is necessary where you install a Security Manager.
I had found the answer to all my RMI problems in the Core Java Vol-II. Interestingly, the author opines that it setting a security manager on the Server is unnecessary. A Security Manager is useful only on the client.
 
Rudy Yeung
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Thank you all.
I finally manage to read/write the database db.db through RMI though the client and server are on running on the same machine. I will try running the client and server on separate machines tomorrow. Afterwards, I only have the very last item to handle: concurrent access.
Without any hassle, I have my policy file set to all permission like the following. Do you guys fine tune the policy file or just set it to all permission like I do?

 
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