Iteration in DistributedTaskLifecycleService using ServiceLoader fails

For some unknown reason iteration over available DistributedTaskLifecycle services in DistributedTaskLifecycleService fails, and it fails only in AS environment:

Caused by: java.util.NoSuchElementException
at java.util.AbstractList$Itr.next(AbstractList.java:350) [classes.jar:1.6.0_31]
at java.util.Collections$1.nextElement(Collections.java:3389) [classes.jar:1.6.0_31]
at java.util.ServiceLoader$LazyIterator.hasNext(ServiceLoader.java:332) [classes.jar:1.6.0_31]
at java.util.ServiceLoader$1.hasNext(ServiceLoader.java:415) [classes.jar:1.6.0_31]
at org.infinispan.distexec.spi.DistributedTaskLifecycleService.onPreExecute(DistributedTaskLifecycleService.java:50) [infinispan-core-5.2.0-SNAPSHOT.jar:5.2.0-SNAPSHOT]

public <T> void onPreExecute(Callable<T> task) {
try {
Iterator<DistributedTaskLifecycle> i = loader.iterator();
while (i.hasNext()) { // <------------------------------------------------- we CHECK before
DistributedTaskLifecycle cl = i.next();
cl.onPreExecute(task);