Repository Corruption when modifying content properties

laurents — Fri, 30 Jul 2010 19:26:37 GMT

Hi all,from a new Alfresco installation v3.4 (latest check out from yesterday) have re-compiled and re-deployed alfresco.war into Tomcat. All went fine, startup fine, no errors in catalina.out logs, a fresh new repository is created and a new alfresco DB setup with tables and content, no MySQL error

Re: Repository Corruption when modifying content properties

laurents — Mon, 02 Aug 2010 15:20:05 GMT

guys at Alfresco,

I found a work around but I am not sure if it is orthodox ! It is a simple hack and an explanation how to prevent the above error to happen. The Java class concerned is :

projects/repository/source/java/org/alfresco/repo/domain/node/AbstractNodeDAOImpl.java

method : setNodePropertiesImpl

The problem is that at line 1701 in the original class where the exception is raised we have this :
ContentDataWithId contentDataWithId = (ContentDataWithId) valueToDelete.getValue(DataTypeDefinition.CONTENT);

here, there is a casting done on a serialized object which "sometimes" is NOT ContentDataWithId. In general it is common practice in Java to perform a test on a serialized object's type before using it in order to make sure there is no error at run-time. So I have changed the code as below in red, the error does not occur anymore. However I am not sure about possible side effects.

- What to do with objects which are not of type ContentDataWithId ?
- Are there other coding errors like these across the sources, if yes we are all running on a mine field on the community edition…

Quick fix coded in red :

// Add or remove properties as we go
        ContentDataWithId cdwi;
        for (Map.Entry<NodePropertyKey, MapValueComparison> entry : persistableDiff.entrySet())
        {
            NodePropertyKey key = entry.getKey();

            QName qname = qnameDAO.getQName(key.getQnameId()).getSecond();

            PropertyDefinition removePropDef = dictionaryService.getProperty(qname);
            boolean isContent = (removePropDef != null &&
                    removePropDef.getDataType().getName().equals(DataTypeDefinition.CONTENT));

            switch (entry.getValue())
            {
            case NULL:
            case EQUAL:
                // The entries are the same
                propsToDelete.remove(key);
                propsToAdd.remove(key);
                continue;
            case RIGHT_ONLY:
                // Only in new props: add
                propsToDelete.remove(key);
                // Handle new content
                if (isContent)
                {
                    // The new value needs conversion to the ID-based ContentData reference
                    NodePropertyValue newPropValue = propsToAdd.get(key);
                    ContentData newContentData = (ContentData) newPropValue.getValue(DataTypeDefinition.CONTENT);
                    if (newContentData != null)
                    {
                        Long newContentDataId = contentDataDAO.createContentData(newContentData).getFirst();
                        cdwi = new ContentDataWithId(newContentData, newContentDataId);
                        newPropValue = new NodePropertyValue(DataTypeDefinition.CONTENT, new ContentDataId(newContentDataId));
                        propsToAdd.put(key, newPropValue);
                        newPropsRaw.put(key, new NodePropertyValue(DataTypeDefinition.CONTENT, cdwi));
                    }
                }
                continue;
            case LEFT_ONLY:
                // Only present in old props: must not be added
                propsToAdd.remove(key);
                // Handle deleted content
                if (isContent)
                {
                    // The old values will be an ID-based ContentData reference
                    NodePropertyValue valueToDelete = propsToDelete.get(key);
                    if (valueToDelete.getValue(DataTypeDefinition.CONTENT) instanceof ContentDataWithId) {
                        cdwi = (ContentDataWithId) valueToDelete.getValue(DataTypeDefinition.CONTENT);
                        if (cdwi != null) {
                            Long contentDataId = cdwi.getId();
                            contentDataDAO.deleteContentData(contentDataId);
                        }
                    } else {
                    // What needs to be done here, when the object is not the type expected ?
                    }
                }
                continue;
            case NOT_EQUAL:
                // Value has changed: remove and add
                if (isContent)
                {
                    // The old values will be an ID-based ContentData reference
                    NodePropertyValue valueToDelete = propsToDelete.get(key);
                    if (valueToDelete.getValue(DataTypeDefinition.CONTENT) instanceof ContentDataWithId) {
                        cdwi = (ContentDataWithId) valueToDelete.getValue(DataTypeDefinition.CONTENT);
                        if (cdwi != null) {
                            Long contentDataId = cdwi.getId();
                            contentDataDAO.deleteContentData(contentDataId);
                        }
                    } else {
                    // What needs to be done here, when the object is not the type expected ?
                    }

                    // The new value needs conversion to the ID-based ContentData reference
                    NodePropertyValue newPropValue = propsToAdd.get(key);
                    ContentData newContentData = (ContentData) newPropValue.getValue(DataTypeDefinition.CONTENT);
                    if (newContentData != null)
                    {
                        Long newContentDataId = contentDataDAO.createContentData(newContentData).getFirst();
                        cdwi = new ContentDataWithId(newContentData, newContentDataId);
                        newPropValue = new NodePropertyValue(DataTypeDefinition.CONTENT, new ContentDataId(newContentDataId));
                        propsToAdd.put(key, newPropValue);
                        newPropsRaw.put(key, new NodePropertyValue(DataTypeDefinition.CONTENT, cdwi));
                    }
                }
                continue;
            default:
                throw new IllegalStateException("Unknown MapValueComparison: " + entry.getValue());
            }
        }

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Repository Corruption when modifying content properties

Re: Repository Corruption when modifying content properties