Seeing the same error on public fields also. Entity class is:

package org.jboss.as.test.integration.hibernate.search;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

import org.hibernate.search.annotations.Field;
import org.hibernate.search.annotations.Indexed;

@Entity @Indexed
public class Book

Unknown macro: { @Id @GeneratedValue public Long id; @Field public String title; }

Exception call stack:

Caused by: org.hibernate.property.access.spi.PropertyAccessException: Error accessing field [public java.lang.Long org.jboss.as.test.integration.hibernate.search.Book.id] by reflection for persistent property org.jboss.as.test.integration.hibernate.search.Book#id : org.jboss.as.test.integration.hibernate.search.Book@64a5fb4c
at org.hibernate.property.access.spi.GetterFieldImpl.get(GetterFieldImpl.java:43)
at org.hibernate.tuple.entity.AbstractEntityTuplizer.getIdentifier(AbstractEntityTuplizer.java:223)
at org.hibernate.persister.entity.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:4526)
at org.hibernate.persister.entity.AbstractEntityPersister.isTransient(AbstractEntityPersister.java:4240)
at org.hibernate.engine.internal.ForeignKeys.isTransient(ForeignKeys.java:226)
at org.hibernate.event.internal.AbstractSaveEventListener.getEntityState(AbstractSaveEventListener.java:510)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:99)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:58)
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:774)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:747)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:752)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:1143)
... 212 more
Caused by: java.lang.IllegalArgumentException: Can not set java.lang.Long field org.jboss.as.test.integration.hibernate.search.Book.id to org.jboss.as.test.integration.hibernate.search.Book
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:167)
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:171)
at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:58)
at sun.reflect.UnsafeObjectFieldAccessorImpl.get(UnsafeObjectFieldAccessorImpl.java:36)
at java.lang.reflect.Field.get(Field.java:393)
at org.hibernate.property.access.spi.GetterFieldImpl.get(GetterFieldImpl.java:39)
... 223 more