Unable to determine server capabilities when starting 6.2 on JDK11

• Type: Bug
• Status: Closed
• Resolution: Won't Fix
• Affects Version/s: 6.2.X EE
• Fix Version/s: 7.0.X
• Component/s: Environments > Java Runtime
• Labels:
  • jdk11
• Fix Priority: 4
• JDK:
  Oracle OpenJDK 11

Steps to reproduce:

1. Build ee-6.2.x on JDK8 with the following build properties

   jsp.precompile=off
   javac.compiler=modern
   

2. Start 6.2 portal instance on tomcat using jdk 11

Expected result:
Portal instance is successfully started without error.
Actual result:

19:18:44,360 INFO  [localhost-startStop-1][VerifyProcess:65] Verifying com.liferay.portal.verify.VerifyWiki
19:18:44,365 INFO  [localhost-startStop-1][VerifyProcess:65] Verifying com.liferay.portal.verify.VerifyWorkflow
19:18:44,430 ERROR [localhost-startStop-1][ServerCapabilitiesUtil:61] Unable to determine server capabilities
java.lang.reflect.InaccessibleObjectException: Unable to make field private final jdk.internal.loader.BuiltinClassLoader jdk.internal.loader.BuiltinClassLoader.parent accessible: module java.base does not "opens jdk.internal.loader" to unnamed module @194b2216
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:340)
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:280)
	at java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:176)
	at java.base/java.lang.reflect.Field.setAccessible(Field.java:170)
	at com.liferay.portal.server.DeepNamedValueScanner._scanObject(DeepNamedValueScanner.java:521)
	at com.liferay.portal.server.DeepNamedValueScanner._scan(DeepNamedValueScanner.java:455)
	at com.liferay.portal.server.DeepNamedValueScanner._scanObject(DeepNamedValueScanner.java:526)
	at com.liferay.portal.server.DeepNamedValueScanner._scan(DeepNamedValueScanner.java:455)
	at com.liferay.portal.server.DeepNamedValueScanner._scanObject(DeepNamedValueScanner.java:526)
	at com.liferay.portal.server.DeepNamedValueScanner._scan(DeepNamedValueScanner.java:455)
	at com.liferay.portal.server.DeepNamedValueScanner._scanObject(DeepNamedValueScanner.java:526)
	at com.liferay.portal.server.DeepNamedValueScanner._scan(DeepNamedValueScanner.java:455)
	at com.liferay.portal.server.DeepNamedValueScanner._scanObject(DeepNamedValueScanner.java:526)
	at com.liferay.portal.server.DeepNamedValueScanner._scan(DeepNamedValueScanner.java:455)
	at com.liferay.portal.server.DeepNamedValueScanner._scanObject(DeepNamedValueScanner.java:526)
	at com.liferay.portal.server.DeepNamedValueScanner._scan(DeepNamedValueScanner.java:455)
	at com.liferay.portal.server.DeepNamedValueScanner.scan(DeepNamedValueScanner.java:138)
	at com.liferay.portal.server.capabilities.TomcatServerCapabilities.determineSupportsHotDeploy(TomcatServerCapabilities.java:43)
	at com.liferay.portal.server.capabilities.TomcatServerCapabilities.determine(TomcatServerCapabilities.java:29)
	at com.liferay.portal.server.capabilities.ServerCapabilitiesUtil.determineServerCapabilities(ServerCapabilitiesUtil.java:58)
	at com.liferay.portal.servlet.MainServlet.initServerDetector(MainServlet.java:969)
	at com.liferay.portal.servlet.MainServlet.init(MainServlet.java:280)
	at javax.servlet.GenericServlet.init(GenericServlet.java:158)
	at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1230)
	at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1174)
	at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1066)
	at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5409)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5707)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:1017)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:993)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
	at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:712)
	at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:2003)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:834)

Does not appear to affect functionality. Server still fully starts and user can login. User can still use deploy directory to hot deploy wars.