Tests from org.infinispan.lucene fails on JDK6

Several tests from org.infinispan.lucene fails on JDK6,

• org.infinispan.lucene.cacheloader.WarmCacheTest.createBeforeClass fails with (see e.g. this Jekins job)

  java.lang.NoClassDefFoundError: java/nio/file/attribute/FileAttribute
  [...]
  Caused by: java.lang.ClassNotFoundException: java.nio.file.attribute.FileAttribute
  	at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
  	at java.security.AccessController.doPrivileged(Native Method)
  	at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
  	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
  	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
  	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
  	... 24 more
  

• org.infinispan.lucene.cacheloader.WarmCacheTest.clearContent fails with

  java.lang.IllegalStateException: No caches registered! Use registerCacheManager(Cache... caches) to do that!
  	at org.infinispan.test.MultipleCacheManagersTest.clearContent(MultipleCacheManagersTest.java:96)
  	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  	at java.lang.reflect.Method.invoke(Method.java:597)
  	at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:80)
  	at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:564)
  	at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:213)
  	at org.testng.internal.Invoker.invokeMethod(Invoker.java:786)
  	at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:901)
  	at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1231)
  	at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127)
  	at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111)
  	at org.testng.TestRunner.privateRun(TestRunner.java:767)
  	at org.testng.TestRunner.run(TestRunner.java:617)
  	at org.testng.SuiteRunner.runTest(SuiteRunner.java:334)
  	at org.testng.SuiteRunner.access$000(SuiteRunner.java:37)
  	at org.testng.SuiteRunner$SuiteWorker.run(SuiteRunner.java:368)
  	at org.testng.internal.thread.ThreadUtil$2.call(ThreadUtil.java:64)
  	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
  	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
  	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
  	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
  	at java.lang.Thread.run(Thread.java:662)
  

• org.infinispan.lucene.cacheloader.WarmCacheTest.clearTempDir fails with NPE:

  java.lang.NullPointerException
  	at org.infinispan.test.TestingUtil.recursiveFileRemove(TestingUtil.java:573)
  	at org.infinispan.lucene.cacheloader.WarmCacheTest.clearTempDir(WarmCacheTest.java:78)
  	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  	at java.lang.reflect.Method.invoke(Method.java:597)
  	at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:80)
  	at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:564)
  	at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:213)
  	at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:138)
  	at org.testng.internal.TestMethodWorker.invokeAfterClassMethods(TestMethodWorker.java:225)
  	at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:114)
  	at org.testng.TestRunner.privateRun(TestRunner.java:767)
  	at org.testng.TestRunner.run(TestRunner.java:617)
  	at org.testng.SuiteRunner.runTest(SuiteRunner.java:334)
  	at org.testng.SuiteRunner.access$000(SuiteRunner.java:37)
  	at org.testng.SuiteRunner$SuiteWorker.run(SuiteRunner.java:368)
  	at org.testng.internal.thread.ThreadUtil$2.call(ThreadUtil.java:64)
  	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
  	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
  	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
  	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
  	at java.lang.Thread.run(Thread.java:662)