Integration tests fail with java.security.AccessControlException

[jvj]

I'm trying to run integration tests with Elasticsearch 5 by extending ESIntegTestCase in my class. However, it always fails with java.security.AccessControlException: access denied ("java.lang.RuntimePermission" "setDefaultUncaughtExceptionHandler"), no matter what I try.

I have tried to set ES_JAVA_OPTS="-Dtests.security.manager=false" and ES_JAVA_OPTS="-Djava.security.policy=my_project/src/main/resources/plugin-security.policy". The file contains:
grant {
permission java.lang.RuntimePermission "setDefaultUncaughtExceptionHandler";
permission org.elasticsearch.ThreadPermission "modifyArbitraryThreadGroup";
};

https://www.elastic.co/guide/en/elasticsearch/plugins/5.0/plugin-authors.html asks to put plugin-security.policy in src/main/plugin-metadata, which I did, but I use Maven and the file does not get picked up, I guess. I could use Gradle as well if needed, but it's not clear what "Gradle build system" is and how to get that in my project?

I also tried to run the integration tests following the instructions in http://david.pilato.fr/blog/2016/10/18/elasticsearch-real-integration-tests-updated-for-ga/, but no luck.

How can I get testing work?

[jvj]

Replying to myself: I got it solved by including <argLine>-Dtests.security.manager=false</argLine> in randomizedtesting maven plugin configuration. Not sure why the policy file is not picked up, though.