Some of the tests from package org.drools.compiler.integrationtests.concurrency [1] miss timetout in the @Test annotation. This can cause build hangs when something wrong happens during a test.

[1] https://github.com/baldimir/drools/tree/6b24ae59ae21bc0146d11bcb7606d1b42a99513c/drools-compiler/src/test/java/org/drools/compiler/integrationtests/concurrency