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[tycho-user] Debugging Tycho Surefire Class Loading issues 
Hi,

I'm setting up a new project with Tycho 2.3.0 in pomless mode and I'm running into issues getting tests to run.

This is the exception I am seeing:
Root exception:
java.lang.NoClassDefFoundError: com/salesforce/bazel/sdk/model/BazelPackageLocation
	at java.base/java.lang.Class.getDeclaredMethods0(Native Method)
	at java.base/java.lang.Class.privateGetDeclaredMethods(Class.java:3166)
	at java.base/java.lang.Class.getMethodsRecursive(Class.java:3307)
	at java.base/java.lang.Class.getMethod0(Class.java:3293)
	at java.base/java.lang.Class.getMethod(Class.java:2106)
	at org.apache.maven.surefire.util.ReflectionUtils.tryGetMethod(ReflectionUtils.java:60)
	at org.apache.maven.surefire.common.junit3.JUnit3TestChecker.isSuiteOnly(JUnit3TestChecker.java:66)
	at org.apache.maven.surefire.common.junit3.JUnit3TestChecker.isValidJUnit3Test(JUnit3TestChecker.java:61)
	at org.apache.maven.surefire.common.junit3.JUnit3TestChecker.accept(JUnit3TestChecker.java:56)
	at org.apache.maven.surefire.common.junit4.JUnit4TestChecker.accept(JUnit4TestChecker.java:53)
	at org.apache.maven.surefire.util.DefaultScanResult.applyFilter(DefaultScanResult.java:102)
	at org.apache.maven.surefire.junit4.JUnit4Provider.scanClassPath(JUnit4Provider.java:309)
	at org.apache.maven.surefire.junit4.JUnit4Provider.setTestsToRun(JUnit4Provider.java:189)
	at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:132)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray2(ReflectionUtils.java:206)
	at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:161)
	at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:84)
	at org.eclipse.tycho.surefire.osgibooter.OsgiSurefireBooter.run(OsgiSurefireBooter.java:116)
	at org.eclipse.tycho.surefire.osgibooter.HeadlessTestApplication.start(HeadlessTestApplication.java:23)
	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:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	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)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1435)
Caused by: java.lang.ClassNotFoundException: com.salesforce.bazel.sdk.model.BazelPackageLocation cannot be found by com.salesforce.bazel-java-sdk.tests_1.0.0.qualifier
	at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:519)
	at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:171)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
	... 36 more


At a first glance, it looks like a test platform issue. The class exists in a bundle that is part of the reactor (also build by Tycho pomless) and listed as Require-Bundle dependency in the  com.salesforce.bazel-java-sdk.tests_1.0.0.qualifier bundle.

The class itself is an interface and shouldn't cause any issues loading.
https://github.com/salesforce/bazel-eclipse/blob/master/bundles/com.salesforce.bazel-java-sdk/src/main/java/com/salesforce/bazel/sdk/model/BazelPackageLocation.java

Inspecting the work folder I can see that the bundle with the class is actually listed in config.ini/osgi.bundles

I checked with the OSGi console and all bundles seems to be there. Also the bundle with the class in question. Thus, I don't really understand why Surefire is failing to load the class.

Any ideas?

-Gunnar

-- 
Gunnar Wagenknecht
gunnar@xxxxxxxxxxxxxxx, http://guw.io/

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