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componentDefinition.setEntityClassNames(new String[] {CustomEntityImpl.class.getName()});
componentDefinition.setEntityFactoryClassName(DefaultJcrEntityFactoryImpl.class.getName());
componentDefinition.setPersistenceManagerClassName(DefaultJcrPersistenceManager.class.getName());

Do not invoke setEntityClassNames(…) on the same entity in different component definitions. This causes a non-deterministic definition of the component that owns the entity and will cause errors in some occasions, like when purging the component.