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https://issues.apache.org/jira/browse/DERBY-3445?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12583713#action_12583713
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Vemund Østgaard commented on DERBY-3445:
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> A better long term solution would be to allow a set of policies to be added 
> into the network server's default set. E.g. could add this policy file 
> emma.policy:
> 
> grant codebase "... path to emma jars" {
>    // permissions needed
> }
> 
> java -jar derbyrun.jar server -additionalPolicy emma.policy start
> 
> This would then be logically added into the permission set that Derby 
> installs automatically.

As far as I understand your suggestion is to add a new option to the network 
server (-additionalPolicy, or something along those lines). This new option 
would then only have an effect if the network server is started in a way that 
causes it to install its own default security policy. The effect would then be 
to merge the contents of the default policy file (server.policy) with whatever 
policy file is added with the new argument (emma.policy) into a new file, and 
then set the java.security.policy property to point to this file before 
installing a SecurityManager. 

Would this be a feature added just to be able to test the product with EMMA, or 
do you think of other use cases as well?
Real users would be able to put a policy file under ${user.home}/.java.policy 
or just set -Djava.security.policy, so I guess they wouldn't have a need for 
it. 


> Make it easier to use the EMMA tool to measure the code coverage of the Derby 
> testing
> -------------------------------------------------------------------------------------
>
>                 Key: DERBY-3445
>                 URL: https://issues.apache.org/jira/browse/DERBY-3445
>             Project: Derby
>          Issue Type: Improvement
>          Components: Build tools
>            Reporter: Vemund Østgaard
>            Assignee: Vemund Østgaard
>         Attachments: 3445-emma-clean-fix-diff, 3445-general-diff, 
> 3445-general-diffv2, 3445-singletest-codeline-jars-diff, 
> 3445-singletest-diff, 3445-SysinfoLocaleTest-diff, 3445-testspecific-diff, 
> 3445-testspecific-diffv2
>
>
> It is a bit tricky to use EMMA to measure code coverage for the derby testing.
> Modifications must be made to the source both to avoid problems with the 
> SecurityManager and individual tests. It would be good if these modifcations 
> could be done once and for all so that it was easier for anyone to run the 
> tests with EMMA.
> It would also be good to have ant tasks that would make it even easier to run 
> the tests with EMMA.

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