@Entity
@Table(name = "PROVIDER")
@Audited
public class Provider {
...

    @ElementCollection(fetch = FetchType.LAZY)
	@CollectionTable(name = "PROVIDER_VELOCITY",
		joinColumns = @JoinColumn(name = "PROVIDER_ID"), foreignKey = @javax.persistence.ForeignKey(name = "PROVIDER_VELOCITY_ID_CONSTRAINT"))
	private List<ProviderVelocity> providerVelocity = new ArrayList<>();

       public List<ProviderVelocity> getProviderVelocity() {
	     return Collections.unmodifiableList(providerVelocity);
	}
	...

}


@Embeddable
@Audited
public class ProviderVelocity {

    ...
        @ManyToOne(fetch = FetchType.LAZY)
    	@JoinColumn(name = "VELOCITY_ACTIVITY_TYPE_ID",
    			foreignKey = @ForeignKey(name = "ACTIVITY_TYPE_PROVIDER_VELOCITY_ID_CONSTRAINT"))
    	@Audited(targetAuditMode = RelationTargetAuditMode.NOT_AUDITED)
    	private ActivityType activityType;
    	...
    	
}

@Entity
@Table(name = "ACTIVITY_TYPE")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
public class ActivityType {
 //activity type is some kind of dictionary value
 ....
}

org.hibernate.envers.exception.AuditException: java.lang.NullPointerException
	at org.hibernate.envers.internal.entities.mapper.relation.component.MiddleEmbeddableComponentMapper.mapToObjectFromFullMap(MiddleEmbeddableComponentMapper.java:55)
	at org.hibernate.envers.internal.entities.mapper.relation.lazy.initializor.BasicCollectionInitializor.addToCollection(BasicCollectionInitializor.java:74)
	at org.hibernate.envers.internal.entities.mapper.relation.lazy.initializor.BasicCollectionInitializor.addToCollection(BasicCollectionInitializor.java:26)
	at org.hibernate.envers.internal.entities.mapper.relation.lazy.initializor.AbstractCollectionInitializor.initialize(AbstractCollectionInitializor.java:54)
	at org.hibernate.envers.internal.entities.mapper.relation.lazy.proxy.CollectionProxy.checkInit(CollectionProxy.java:33)
	at org.hibernate.envers.internal.entities.mapper.relation.lazy.proxy.CollectionProxy.size(CollectionProxy.java:39)
	at org.apache.commons.collections.CollectionUtils.isEqualCollection(CollectionUtils.java:305)
	at eu.xtrf.history.acl.impl.difference.CollectionProcessor.process(CollectionProcessor.java:40)
	at eu.xtrf.history.acl.impl.difference.EntityDifferenceProcessorChain.findDifferencesInternal(EntityDifferenceProcessorChain.java:63)
	at eu.xtrf.history.acl.impl.difference.EntityDifferenceProcessorChain.findDifferences(EntityDifferenceProcessorChain.java:54)
	at eu.xtrf.history.acl.impl.XtrfHistoryEntryAcl.getDetails(XtrfHistoryEntryAcl.java:132)
	at sun.reflect.GeneratedMethodAccessor1372.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
	at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
	at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
	at com.sun.proxy.$Proxy720.getDetails(Unknown Source)
	at eu.xtrf.history.app.SearchResource.getDetails(SearchResource.java:73)
	at sun.reflect.GeneratedMethodAccessor1371.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:139)
	at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:295)
	at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:249)
	at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:236)
	at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:402)
	at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:209)
	at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:221)
	at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:56)
	at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:51)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
	at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)
	at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
	at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
	at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)
	at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
	at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
	at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
	at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
	at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)
	at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292)
	at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81)
	at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138)
	at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135)
	at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)
	at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
	at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
	at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
	at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
	at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
	at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
	at io.undertow.servlet.api.LegacyThreadSetupActionWrapper$1.call(LegacyThreadSetupActionWrapper.java:44)
	at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272)
	at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)
	at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104)
	at io.undertow.server.Connectors.executeRootHandler(Connectors.java:202)
	at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:805)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
	at org.hibernate.envers.internal.entities.EntitiesConfigurations.getRelationDescription(EntitiesConfigurations.java:98)
	at org.hibernate.envers.internal.entities.mapper.relation.ToOneIdMapper.nullSafeMapToEntityFromMap(ToOneIdMapper.java:107)
	at org.hibernate.envers.internal.entities.mapper.relation.AbstractToOneMapper.mapToEntityFromMap(AbstractToOneMapper.java:57)
	at org.hibernate.envers.internal.entities.mapper.MultiPropertyMapper.mapToEntityFromMap(MultiPropertyMapper.java:159)
	at org.hibernate.envers.internal.entities.mapper.relation.component.MiddleEmbeddableComponentMapper.mapToObjectFromFullMap(MiddleEmbeddableComponentMapper.java:44)
	... 74 more