Major ClassFinder.infinispanClasses() tries to find all Infinispan classes by iterating through the classpath entries and adding classes from each entry that contains infinispan in the path or has a sub-sub-...directory called infinispan.
This doesn't work if the Maven repository path contains infinispan, as it happens on the CI agents, and all the classpath entries are included. When trying to parse a class that doesn't start with org., ClassFinder then throws this exception:
08:15:47,413 WARN (TestNG:[]) [ClassFinder] From jar path com/github/benmanes/caffeine/base/UnsafeAccess.class could not load class null java.lang.StringIndexOutOfBoundsException: String index out of range: -1 at java.lang.String.substring(String.java:1960) ~[?:1.8.0_141] at org.infinispan.commons.util.ClassFinder.toClassName(ClassFinder.java:183) ~[infinispan-commons.jar:9.1.1-SNAPSHOT] at org.infinispan.commons.util.ClassFinder.findClassesOnPath(ClassFinder.java:144) [infinispan-commons.jar:9.1.1-SNAPSHOT] at org.infinispan.commons.util.ClassFinder.infinispanClasses(ClassFinder.java:90) [infinispan-commons.jar:9.1.1-SNAPSHOT] at org.infinispan.commons.util.ClassFinder.infinispanClasses(ClassFinder.java:72) [infinispan-commons.jar:9.1.1-SNAPSHOT] at org.infinispan.util.ClassFinderTest.testInfinispanClassesNonEmpty(ClassFinderTest.java:11) [test-classes/:?] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_141] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_141] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_141] at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_141] at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:84) [testng-6.8.8.jar:?] at org.testng.internal.Invoker.invokeMethod(Invoker.java:714) [testng-6.8.8.jar:?] at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:901) [testng-6.8.8.jar:?] at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1231) [testng-6.8.8.jar:?] at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127) [testng-6.8.8.jar:?] at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111) [testng-6.8.8.jar:?] at org.testng.TestRunner.privateRun(TestRunner.java:767) [testng-6.8.8.jar:?] at org.testng.TestRunner.run(TestRunner.java:617) [testng-6.8.8.jar:?] at org.testng.SuiteRunner.runTest(SuiteRunner.java:348) [testng-6.8.8.jar:?] at org.testng.SuiteRunner.access$000(SuiteRunner.java:38) [testng-6.8.8.jar:?] at org.testng.SuiteRunner$SuiteWorker.run(SuiteRunner.java:382) [testng-6.8.8.jar:?] at org.testng.internal.thread.ThreadUtil$2.call(ThreadUtil.java:64) [testng-6.8.8.jar:?] at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_141] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_141] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_141] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_141]