[BUG] Eclipse 2021-06 broken with JDK 1.8 and Lombok plug-in

[lrozenblyum]

Describe the bug
Eclipse 2021-06 broken with lombok plug-in.

Exceptions in logs:

!ENTRY org.eclipse.ui 4 0 2021-07-08 10:08:38.594
!MESSAGE Unhandled event loop exception
!STACK 0
java.lang.reflect.InaccessibleObjectException: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @de45e79
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:357)
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:199)
at java.base/java.lang.reflect.Method.setAccessible(Method.java:193)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.overrideLoadResult(ModuleClassLoader.java:86)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:519)
at org.eclipse.jdt.internal.compiler.parser.Parser.endParse(Parser.java:11750)
at org.eclipse.jdt.internal.core.util.CommentRecorderParser.endParse(CommentRecorderParser.java:135)
at org.eclipse.jdt.internal.compiler.parser.Parser.parse(Parser.java:12949)
at org.eclipse.jdt.internal.compiler.parser.Parser.parse(Parser.java:13176)
at org.eclipse.jdt.internal.compiler.parser.Parser.parse(Parser.java:13133)
at org.eclipse.jdt.internal.compiler.parser.Parser.dietParse(Parser.java:11521)
at org.eclipse.jdt.core.dom.CompilationUnitResolver.parse(CompilationUnitResolver.java:538)
at org.eclipse.jdt.core.dom.ASTParser.internalCreateAST(ASTParser.java:1224)
at org.eclipse.jdt.core.dom.ASTParser.createAST(ASTParser.java:820)
at org.eclipse.jdt.internal.corext.refactoring.TypeContextChecker.parseSuperType(TypeContextChecker.java:771)
at org.eclipse.jdt.internal.corext.refactoring.TypeContextChecker.parseSuperClass(TypeContextChecker.java:746)
at org.eclipse.jdt.ui.wizards.NewTypeWizardPage.superClassChanged(NewTypeWizardPage.java:1948)
at org.eclipse.jdt.ui.wizards.NewTypeWizardPage.typePageDialogFieldChanged(NewTypeWizardPage.java:1232)
at org.eclipse.jdt.ui.wizards.NewTypeWizardPage.access$2(NewTypeWizardPage.java:1196)
at org.eclipse.jdt.ui.wizards.NewTypeWizardPage$TypeFieldsAdapter.dialogFieldChanged(NewTypeWizardPage.java:1131)
at org.eclipse.jdt.internal.ui.wizards.dialogfields.DialogField.dialogFieldChanged(DialogField.java:78)
at org.eclipse.jdt.internal.ui.wizards.dialogfields.StringDialogField.setText(StringDialogField.java:195)
at org.eclipse.jdt.ui.wizards.NewTypeWizardPage.setSuperClass(NewTypeWizardPage.java:1480)
at org.eclipse.jdt.ui.wizards.NewTypeWizardPage.initTypePage(NewTypeWizardPage.java:647)
at org.eclipse.jdt.ui.wizards.NewClassWizardPage.init(NewClassWizardPage.java:94)
at org.eclipse.jdt.internal.ui.wizards.NewClassCreationWizard.addPages(NewClassCreationWizard.java:56)
at org.eclipse.jface.wizard.WizardDialog.createContents(WizardDialog.java:632)
at org.eclipse.jface.window.Window.create(Window.java:431)
at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1094)
at org.eclipse.ui.internal.navigator.wizards.WizardShortcutAction.run(WizardShortcutAction.java:99)
at org.eclipse.jface.action.Action.runWithEvent(Action.java:474)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:580)
at org.eclipse.jface.action.ActionContributionItem.lambda$4(ActionContributionItem.java:414)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4209)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1043)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4026)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3626)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1157)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1046)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155)
at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:644)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:551)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:156)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:152)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:401)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:654)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:591)
at org.eclipse.equinox.launcher.Main.run(Main.java:1462)

To Reproduce
Use JDK1.8 as the Installed JRE (Windows -> Preferences -> Java)
Set compiler compliance level = 1.8.

Create a Maven project.
Try anything (e.g. adding a Class from Project explorer).

Expected behavior
No problems.

Version info (please complete the following information):

• Lombok: 1.18.20
• Eclipse 2021-06, JDK 1.8.0._201

[Rawi01]

Duplicate of #2810