src/main/java/org/apache/jackrabbit/ocm/manager/collectionconverter/impl/ReferenceCollectionConverterImpl.java [138:148]:
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    protected boolean doIsNull(Session session,
                                              Node parentNode,
                                              CollectionDescriptor collectionDescriptor,
                                              Class collectionFieldClass) throws RepositoryException {
        String jcrName = getCollectionJcrName(collectionDescriptor);

         if (!parentNode.hasProperty(jcrName)) {
            return true;
        }
        return false;
    }
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src/main/java/org/apache/jackrabbit/ocm/manager/collectionconverter/impl/EnumCollectionConverterImpl.java [166:176]:
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    protected boolean doIsNull(Session session,
                                              Node parentNode,
                                              CollectionDescriptor collectionDescriptor,
                                              Class collectionFieldClass) throws RepositoryException {
        String jcrName = getCollectionJcrName(collectionDescriptor);

         if (!parentNode.hasProperty(jcrName)) {
            return true;
        }
        return false;
    }
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src/main/java/org/apache/jackrabbit/ocm/manager/collectionconverter/impl/MultiValueCollectionConverterImpl.java [202:212]:
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    protected boolean doIsNull(Session session,
                                              Node parentNode,
                                              CollectionDescriptor collectionDescriptor,
                                              Class collectionFieldClass) throws RepositoryException {
        String jcrName = getCollectionJcrName(collectionDescriptor);

         if (!parentNode.hasProperty(jcrName)) {
            return true;
        }
        return false;
    }
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