Doctrine\ODM\PHPCR\Mapping\ClassMetadata::validateClassMapping PHP Method

    public function validateClassMapping()
    {
        // associative array fields need a separate property to store the keys.
        // make sure that generated or specified name does not collide with an
        // existing mapping.
        $assocFields = array();
        foreach ($this->fieldMappings as $fieldName) {
            $mapping = $this->mappings[$fieldName];
            if (empty($mapping['assoc'])) {
                continue;
            }
            if (isset($this->mappings[$mapping['assoc']])) {
                throw MappingException::assocOverlappingFieldDefinition($this->name, $fieldName, $mapping['assoc']);
            }
            if (!empty($assocFields[$mapping['assoc']])) {
                throw MappingException::assocOverlappingAssocDefinition($this->name, $fieldName, $assocFields[$mapping['assoc']]);
            }
            $assocFields[$mapping['assoc']] = $fieldName;
        }
        if (!empty($this->versionNameField) && !$this->versionable) {
            throw new MappingException(sprintf("You cannot use the @VersionName annotation on the non-versionable document %s (field = %s)", $this->name, $this->versionNameField));
        }
        if (!empty($this->versionCreatedField) && !$this->versionable) {
            throw new MappingException(sprintf("You cannot use the @VersionCreated annotation on the non-versionable document %s (field = %s)", $this->name, $this->versionCreatedField));
        }
        if (count($this->translatableFields)) {
            if (!isset($this->localeMapping)) {
                throw new MappingException("You must define a locale mapping for translatable document '" . $this->name . "'");
            }
        }
        // we allow mixed referrers on non-referenceable documents. maybe the mix:referenceable is just not mapped
        if (count($this->referrersMappings)) {
            if (!$this->referenceable) {
                throw new MappingException('You can not have referrers mapped on document "' . $this->name . '" as the document is not referenceable');
            }
            foreach ($this->referrersMappings as $referrerName) {
                $mapping = $this->mappings[$referrerName];
                // only a santiy check with reflection. otherwise we could run into endless loops
                if (!ClassLoader::classExists($mapping['referringDocument'])) {
                    throw new MappingException(sprintf('Invalid referrer mapping on document "%s" for field "%s": The referringDocument class "%s" does not exist', $this->name, $mapping['fieldName'], $mapping['referringDocument']));
                }
                $reflection = new ReflectionClass($mapping['referringDocument']);
                if (!$reflection->hasProperty($mapping['referencedBy'])) {
                    throw new MappingException(sprintf('Invalid referrer mapping on document "%s" for field "%s": The referringDocument "%s" has no property "%s"', $this->name, $mapping['fieldName'], $mapping['referringDocument'], $mapping['referencedBy']));
                }
            }
        }
        $this->validateIdentifier();
    }