Illegal warning when starting portal instance on jdk11

• Type: Bug
• Status: Verified
• Resolution: Unresolved
• Affects Version/s: Master
• Fix Version/s: None
• Component/s: Environments > Java Runtime
• Labels:
  • jdk11
• Fix Priority: 3
• JDK:
  Oracle OpenJDK 11

Steps to reproduce:

1. Start portal instance on tomcat using jdk11

Expected result:
No illegal warning.
Actual result:

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.liferay.petra.reflect.ReflectionUtil (file:/Users/malei/dev/project/bundles/master-bundles/tomcat-9.0.10/lib/ext/com.liferay.petra.reflect.jar) to field java.lang.reflect.Field.modifiers
WARNING: Please consider reporting this to the maintainers of com.liferay.petra.reflect.ReflectionUtil
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release