I have the same issue

@ElementCollection(fetch=FetchType.LAZY)
	@Cache(region=CacheRegion.SELDOMCHANGE,usage=CacheConcurrencyStrategy.READ_WRITE)
	@Fetch(FetchMode.SUBSELECT)
	@BatchSize(size=2)
	@JsonView(Views.Detail.class)
	public  List<Integer> getJobIndustry() {
		return jobIndustry;
	}

The problem in my case occurs in Hibernate Search Class Bridge

Caused by: java.lang.NullPointerException
        at org.hibernate.type.descriptor.java.AbstractTypeDescriptor.extractHashCode(AbstractTypeDescriptor.java:88)
        at org.hibernate.type.AbstractStandardBasicType.getHashCode(AbstractStandardBasicType.java:210)
        at org.hibernate.type.AbstractStandardBasicType.getHashCode(AbstractStandardBasicType.java:214)
        at org.hibernate.cache.spi.CacheKey.calculateHashCode(CacheKey.java:71)
        at org.hibernate.cache.spi.CacheKey.<init>(CacheKey.java:67)
        at org.hibernate.internal.AbstractSessionImpl.generateCacheKey(AbstractSessionImpl.java:252)
        at org.hibernate.engine.spi.BatchFetchQueue.isCached(BatchFetchQueue.java:331)
        at org.hibernate.engine.spi.BatchFetchQueue.getCollectionBatch(BatchFetchQueue.java:313)
        at org.hibernate.loader.collection.BatchingCollectionInitializer.initialize(BatchingCollectionInitializer.java:72)
        at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:678)
        at org.hibernate.event.internal.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:80)
        at org.hibernate.internal.SessionImpl.initializeCollection(SessionImpl.java:1804)
        at org.hibernate.collection.internal.AbstractPersistentCollection$4.doWork(AbstractPersistentCollection.java:549)
        at org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:234)
        at org.hibernate.collection.internal.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:545)
        at org.hibernate.collection.internal.AbstractPersistentCollection.read(AbstractPersistentCollection.java:124)
        at org.hibernate.collection.internal.PersistentBag.iterator(PersistentBag.java:266)
        at nl.msw.project.dao.hibernate.bridge.JobOfferClassBridge.set(JobOfferClassBridge.java:52)
        at org.hibernate.search.bridge.util.impl.ContextualExceptionBridgeHelper$OneWayConversionContextImpl.set(ContextualExceptionBridgeHelper.java:123)
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