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The problem is in the following helper: helper def: isEmpty(): Boolean = Sequence{}.subSequence(1, 0).size() = 0; Upon invocation this helper will report an IllegalAccessException when size() is invoked on the SubSequence. The complete stacktrace is: org.eclipse.m2m.atl.engine.emfvm.VMException: Could not invoke operation size on [] Java Stack: org.eclipse.m2m.atl.engine.emfvm.VMException: Could not invoke operation size on [] at org.eclipse.m2m.atl.engine.emfvm.adapter.EMFModelAdapter.invoke(EMFModelAdapter.java:762) at org.eclipse.m2m.atl.engine.emfvm.ASMOperation.exec(ASMOperation.java:425) at org.eclipse.m2m.atl.engine.emfvm.ASMOperation.exec(ASMOperation.java:388) at org.eclipse.m2m.atl.engine.emfvm.ASMOperation.exec(ASMOperation.java:388) at org.eclipse.m2m.atl.engine.emfvm.ASMOperation.exec(ASMOperation.java:388) at org.eclipse.m2m.atl.engine.emfvm.ASM.run(ASM.java:208) at org.eclipse.m2m.atl.engine.emfvm.launch.EMFVMLauncher.internalLaunch(EMFVMLauncher.java:170) at org.eclipse.m2m.atl.engine.emfvm.launch.EMFVMUILauncher.launch(EMFVMUILauncher.java:46) at org.eclipse.m2m.atl.core.service.LauncherService.launch(LauncherService.java:136) at org.eclipse.m2m.atl.core.ui.launch.AtlLaunchConfigurationDelegate.launchOrDebug(AtlLaunchConfigurationDelegate.java:300) at org.eclipse.m2m.atl.core.ui.launch.AtlLaunchConfigurationDelegate.launch(AtlLaunchConfigurationDelegate.java:234) at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:855) at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:704) at org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:1047) at org.eclipse.debug.internal.ui.DebugUIPlugin$8.run(DebugUIPlugin.java:1251) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53) Caused by: java.lang.IllegalAccessException: Class org.eclipse.m2m.atl.engine.emfvm.adapter.EMFModelAdapter can not access a member of class java.util.Collections$EmptyList with modifiers "public" at sun.reflect.Reflection.ensureMemberAccess(Unknown Source) at java.lang.reflect.AccessibleObject.slowCheckMemberAccess(Unknown Source) at java.lang.reflect.AccessibleObject.checkAccess(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.m2m.atl.engine.emfvm.adapter.EMFModelAdapter.invoke(EMFModelAdapter.java:760) ... 15 more The problem is that java.util.Collections.EmptyList is declared private. Should it even be legal to call subSequence with the above parameters? Workaround: Do proper checks before invoking subSequence and if it would result in an empty sequence, explicitly return an empty sequence.
