AccessControlExeption: Access Denied

I am making an application where users upload a file to my application
and I then parse that file. However, when I do so, I get the following
exception:

com.google.gwt.user.server.rpc.UnexpectedException: Service method
'public abstract boolean
com.webapps.rhinestone.client.RhinestoneAdd.readDataLines(java.lang.String,int)'
threw an unexpected exception: java.security.AccessControlException:
access denied (java.io.FilePermission http:\127.0.0.1:8888\serve?
blob_key=ud9_p4-NuAqHV-db2W_nfQ read)

The line of code where the exception is thrown looks like this:
BufferedReader reader = new BufferedReader(new FileReader(filename));

Is there any way to access the file?

Thanks!

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