Illegal reflective access warning on JDK11

Start with org.assertj.swing.dependency.fest_reflect.util.Accessibles.java and org.assertj.swing.edt.FailOnThreadViolationRepaintManager.java, following the call from GraphicsTestBase.java:54 under JDK 11. Run the affected tests and trace the reflective access warning; done means the tests complete without this illegal-access warning.

Hi, on java 11 I get the following test warnings due to illegal reflective access:

WARNING: Illegal reflective access by org.assertj.swing.dependency.fest_reflect.util.Accessibles$SetAccessibleAction (file:/home/hydrologis/.m2/repository/org/assertj/assertj-swing/3.8.0/assertj-swing-3.8.0.jar) to method javax.swing.SwingUtilities.appContextGet(java.lang.Object)
	at org.assertj.swing.dependency.fest_reflect.util.Accessibles$SetAccessibleAction.run(Accessibles.java:70)
	at org.assertj.swing.dependency.fest_reflect.util.Accessibles$SetAccessibleAction.run(Accessibles.java:60)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at org.assertj.swing.dependency.fest_reflect.util.Accessibles.setAccessible(Accessibles.java:57)
	at org.assertj.swing.dependency.fest_reflect.util.Accessibles.makeAccessible(Accessibles.java:46)
	at org.assertj.swing.dependency.fest_reflect.method.Invoker.invoke(Invoker.java:111)
	at org.assertj.swing.edt.FailOnThreadViolationRepaintManager.currentRepaintManager(FailOnThreadViolationRepaintManager.java:82)
	at org.assertj.swing.edt.FailOnThreadViolationRepaintManager.installNew(FailOnThreadViolationRepaintManager.java:94)
	at org.assertj.swing.edt.FailOnThreadViolationRepaintManager.install(FailOnThreadViolationRepaintManager.java:57)
	at org.geotools.swing.testutils.GraphicsTestBase.baseSetUpOnce(GraphicsTestBase.java:54)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:367)
	at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:274)
	at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:238)
	at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:161)
	at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:290)
	at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:242)
	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:121)