Created the issue after reading https://community.jboss.org/thread/203382?tstart=0

The relevant part of the stacktrace:

18:44:52,097 ERROR [org.infinispan.interceptors.InvocationContextInterceptor] (MSC service thread 1-8) ISPN000136: Execution error: java.lang.NullPointerException

at org.hibernate.cache.spi.CacheKey.equals(CacheKey.java:81) [hibernate-core-4.1.5.SP1.jar:4.1.5.SP1]

at org.infinispan.context.SingleKeyNonTxInvocationContext.lookupEntry(SingleKeyNonTxInvocationContext.java:93)

at org.infinispan.container.EntryFactoryImpl.getFromContext(EntryFactoryImpl.java:204)

at org.infinispan.container.EntryFactoryImpl.wrapEntryForReading(EntryFactoryImpl.java:80)

at org.infinispan.interceptors.EntryWrappingInterceptor.visitGetKeyValueCommand(EntryWrappingInterceptor.java:112)

at org.infinispan.commands.read.GetKeyValueCommand.acceptVisitor(GetKeyValueCommand.java:60)

At SingleKeyNonTxInvocationContext.java:93 it could happen that equals(null) is invoked. Arguably this could be fixed in Infinispan as it's not a meaningfull invocation, but I think Hibernate ORM should guard against it.