Byteman JUnit5 uses Optional.isEmpty() which was introduced in JDK11. So Byteman with JUnit5 fails on all JDKs except JDK11.
java.lang.NoSuchMethodError: java.util.Optional.isEmpty()Z at org.jboss.byteman.contrib.bmunit.BMUnit5ConfigHandler.beforeAll(BMUnit5ConfigHandler.java:48) at org.junit.jupiter.engine.descriptor.ClassTestDescriptor.lambda$invokeBeforeAllCallbacks$8(ClassTestDescriptor.java:361) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.jupiter.engine.descriptor.ClassTestDescriptor.invokeBeforeAllCallbacks(ClassTestDescriptor.java:361) at org.junit.jupiter.engine.descriptor.ClassTestDescriptor.before(ClassTestDescriptor.java:197) at org.junit.jupiter.engine.descriptor.ClassTestDescriptor.before(ClassTestDescriptor.java:77) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:132) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125) at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122) at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80) at java.util.ArrayList.forEach(ArrayList.java:1257) at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125) at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122) at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80) at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32) at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57) at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:220) at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$6(DefaultLauncher.java:188) at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:202) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:181) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:128) at org.eclipse.jdt.internal.junit5.runner.JUnit5TestReference.run(JUnit5TestReference.java:89) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:541) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:763) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:463) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:209) Suppressed: java.lang.Exception: BMUnit test class configuration popped without prior push! at org.jboss.byteman.contrib.bmunit.BMUnitConfigState.popConfigurationState(BMUnitConfigState.java:683) at org.jboss.byteman.contrib.bmunit.BMUnit5ConfigHandler.uninstall(BMUnit5ConfigHandler.java:70) at org.jboss.byteman.contrib.bmunit.BMUnit5ConfigHandler.uninstall(BMUnit5ConfigHandler.java:32) at org.jboss.byteman.contrib.bmunit.BMUnit5AbstractHandler.afterAll(BMUnit5AbstractHandler.java:104) at org.junit.jupiter.engine.descriptor.ClassTestDescriptor.lambda$invokeAfterAllCallbacks$12(ClassTestDescriptor.java:399) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.jupiter.engine.descriptor.ClassTestDescriptor.lambda$invokeAfterAllCallbacks$13(ClassTestDescriptor.java:399) at java.util.ArrayList.forEach(ArrayList.java:1257) at org.junit.jupiter.engine.descriptor.ClassTestDescriptor.invokeAfterAllCallbacks(ClassTestDescriptor.java:399) at org.junit.jupiter.engine.descriptor.ClassTestDescriptor.after(ClassTestDescriptor.java:221) at org.junit.jupiter.engine.descriptor.ClassTestDescriptor.after(ClassTestDescriptor.java:77) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:145) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:145) ... 29 more