| [tycho-user] Tycho 2.1.0 cannot run tests with Java 1.8 anymore. Bug? |
Hi, I am currently updating from Tycho 2.0.0 to 2.1.0. Well, actually I want to update to 2.3.0 but the build breaks somewhere between 2.0.0 and 2.1.0. I use toolchains to build my plug-in against different Eclipse versions, ranging all from Eclipse Luna to Eclipse 2021-03. My own Bundle-RequiredExecutionEnvironment is always JavaSE-1.8, maven.compiler.source|target are 1.8, and I even use the maven-enforcer-plugin's <enforceBytecodeVersion> rule to check that my own JAR doesn't contain any bytecode that won't run on a Java 1.8 JRE. Unfortunately, tests that ran previously just fine with Java 1.8 in a target platform based on Eclipse 2020-06 (the last Eclipse still supporting Java 1.8) now fail with this error message: > org.apache.maven.surefire.util.SurefireReflectionException: java.lang.ClassNotFoundException: org.apache.maven.surefire.junitplatform.JUnitPlatformProvider > at org.apache.maven.surefire.util.ReflectionUtils.loadClass(ReflectionUtils.java:249) > at org.apache.maven.surefire.util.ReflectionUtils.instantiateOneArg(ReflectionUtils.java:133) > at org.apache.maven.surefire.booter.SurefireReflector.instantiateProvider(SurefireReflector.java:265) > at org.apache.maven.surefire.booter.ProviderFactory.createProvider(ProviderFactory.java:118) > at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:83) > at org.eclipse.tycho.surefire.osgibooter.OsgiSurefireBooter.run(OsgiSurefireBooter.java:114) > at org.eclipse.tycho.surefire.osgibooter.AbstractUITestApplication$1.run(AbstractUITestApplication.java:35) > at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:40) > at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:185) > at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4928) > at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:4449) > at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1158) > at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338) > at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1047) > at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155) > at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:658) > at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338) > at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:557) > at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:154) > at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:150) > at org.eclipse.tycho.surefire.osgibooter.UITestApplication.runApplication(UITestApplication.java:27) > at org.eclipse.tycho.surefire.osgibooter.AbstractUITestApplication.run(AbstractUITestApplication.java:120) > at org.eclipse.tycho.surefire.osgibooter.UITestApplication.start(UITestApplication.java:33) > at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203) > at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:137) > at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:107) > at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:401) > at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) > at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) > at java.lang.reflect.Method.invoke(Method.java:498) > at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:657) > at org.eclipse.equinox.launcher.Main.basicRun(Main.java:594) > at org.eclipse.equinox.launcher.Main.run(Main.java:1447) > at org.eclipse.equinox.launcher.Main.main(Main.java:1420) > Caused by: java.lang.ClassNotFoundException: org.apache.maven.surefire.junitplatform.JUnitPlatformProvider > at org.eclipse.tycho.surefire.osgibooter.CombinedClassLoader.findClass(CombinedClassLoader.java:37) > at java.lang.ClassLoader.loadClass(ClassLoader.java:419) > at java.lang.ClassLoader.loadClass(ClassLoader.java:352) > at org.apache.maven.surefire.util.ReflectionUtils.loadClass(ReflectionUtils.java:241) > ... 35 more I suspect that the root cause is a class file with major verison 55 (aka Java 11) which cannot be loaded by the forked Java 1.8 JVM used to run the tests: [INFO] --- tycho-surefire-plugin:2.1.0:test (default-test) @ com.teamscale.ide.eclipse.tests --- [INFO] Toolchain in tycho-surefire-plugin: JDK[/usr/lib/jvm/zulu-8-amd64] I know that Tycho 2.1.0 itself requires Java 11, but would have hoped that this does not apply to its test runtime, as sanity checking your plugin against less modern target platforms seems to be a valid use case. Now, as far as I can see, the org.eclipse.tycho:org.eclipse.tycho.surefire.junit5:2.1.0 artifact containing org.apache.maven.surefire.junitplatform.JUnitPlatformProvider only contains Java 1.8 compatible classes: javap/grep/sort/uniq magic: > 2 major version: 49 > 18 major version: 50 > 220 major version: 52 Likewise for org.eclipse.tycho.surefire.osgibooter-2.1.0.jar: > 12 major version: 49 So I suspect there are some other "test runtime" classes not compatible with Java 1.8. (BTW, the JUnit version itself, 5.6.0, is that same as before the Tycho update and compatible with Java 1.8.) Any ideas? IMHO, it should still be possible to use Tycho 2.1.0 or later to execute tests with Java 1.8, even if the rest of Tycho requires Java 11. Best wishes, Andreas Sewe -- Dr. Andreas Sewe | sewe@xxxxxxx | +49 152 56342856 CQSE GmbH | Centa-Hafenbraedl-Strasse 59 | 81249 Muenchen | www.cqse.eu Amtsgericht Muenchen | HRB 177678 | GF: F. Deissenboeck, M. Feilkas
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