A question about java.policy.

[dmjpro]

I want to permit the java application only to read any local file but i don't want any application to update a local file.
Is this related to java.policy?
Please suggest ....!

[r035198x]

I want to permit the java application only to read any local file but i don't want any application to update a local file.
Is this related to java.policy?
Please suggest ....!

No.
You can only control only what your Java program can read using policy files.

[dmjpro]

No.
You can only control only what your Java program can read using policy files.

If I change something odd in java.policy then what happens?

[r035198x]

If I change something odd in java.policy then what happens?

Google knows

[dmjpro]

Google knows

No no don't misunderstand me .... I want to discuss this over here instead of looking for Google.
What I did with this file that is, i changed a line permission java.security.F ilePermission within grant block for applet to do have acces to it's local file system.
That's why i asking about, if i want to change permission settings in java application which runs from the local except Applet code what i need to do.
Please have a discussion over here ..this is my earnest request to all of you experts .... :-)

[dmjpro]

No no don't misunderstand me .... I want to discuss this over here instead of looking for Google.
What I did with this file that is, i changed a line permission java.security.F ilePermission within grant block for applet to do have acces to it's local file system.
That's why i asking about, if i want to change permission settings in java application which runs from the local except Applet code what i need to do.
Please have a discussion over here ..this is my earnest request to all of you experts .... :-)

Sorry r035198x ... I went for details and now the picture is cleared to me. :-)

[r035198x]

Sorry r035198x ... I went for details and now the picture is cleared to me. :-)

Care to share what you found out?

[dmjpro]

Care to share what you found out?

What you told that's right.
The java.policy can't be changed just you can edit it through Program.
A code snippet is given below ..

System.setSecurityManager(new SecurityManager(){
           @Override
            public void checkWrite(String file){
               throw new SecurityException("File write not allowed..!!!");
           }
        });
 
        FileWriter file = new FileWriter("d:/test.txt");
        file.write("My name is Debasis Jana");
        file.close();
 

Here i am getting the security exception.
Now after main thread terminates the default permission set.

Now tell me r035198x, how java.policy works ..could you tell me in details? :-)

[dmjpro]

What you told that's right.
The java.policy can't be changed just you can edit it through Program.
A code snippet is given below ..

System.setSecurityManager(new SecurityManager(){
           @Override
            public void checkWrite(String file){
               throw new SecurityException("File write not allowed..!!!");
           }
        });
 
        FileWriter file = new FileWriter("d:/test.txt");
        file.write("My name is Debasis Jana");
        file.close();
 

Here i am getting the security exception.
Now after main thread terminates the default permission set.

Now tell me r035198x, how java.policy works ..could you tell me in details? :-)

I come back again here.
Actually still it's not clear how java.policy works?
When it's read up..Please tell me in brief. :-)

[r035198x]

I come back again here.
Actually still it's not clear how java.policy works?
When it's read up..Please tell me in brief. :-)

Which part is not clear? Did you read these links?
Link 1
Link 2