Unit batch tests randonly fail in CI with a compile error on core/portal-bootstrap

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.0 Beta 4
• Fix Version/s: 7.0.0 Beta 4
• Component/s: Testing, Testing > CI environments
• Labels: None
• Story Points: 1

See https://github.com/brianchandotcom/liferay-portal/pull/34681#issuecomment-173373862

Randomly, CI fails with a compilation error while building portal-bootstrap:

[exec] /opt/dev/projects/github/liferay-portal/modules/core/portal-bootstrap/src/main/java/com/liferay/portal/bootstrap/ModuleFrameworkImpl.java:660: error: cannot find symbol
     [exec] 			throw new PrincipalException();
     [exec] 			          ^
     [exec]   symbol:   class PrincipalException
     [exec]   location: class ModuleFrameworkImpl