# Cannot Create XML Backup Due to ObjectNotFoundException No Row with Given Identifier

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## 症状

When performing a site XML backup, it doesn't complete and an error like the following appears in the application logs:

2020-06-12 23:01:32,956 ERROR [https-jsse-nio2-443-exec-23] [confluence.importexport.impl.AbstractXmlExporter] backupEntities Couldn't backup database data.
org.hibernate.ObjectNotFoundException: No row with the given identifier exists: [com.atlassian.confluence.core.ContentEntityObject#106709098]

Or, another variation:

[DOCPRIV2:ERROR] LazyInitializer - Exception initializing proxy <net.sf.hibernate.ObjectNotFoundException: No row with the given identifier exists: 2535,
of class: com.atlassian.confluence.core.ContentEntityObject>net.sf.hibernate.ObjectNotFoundException:
No row with the given identifier exists: 2535, of class: com.atlassian.confluence.core.ContentEntityObject
at net.sf.hibernate.ObjectNotFoundException.throwIfNull(ObjectNotFoundException.java:24)
at net.sf.hibernate.proxy.LazyInitializer.initialize(LazyInitializer.java:53)
at net.sf.hibernate.proxy.LazyInitializer.initializeWrapExceptions(LazyInitializer.java:60)
at net.sf.hibernate.proxy.LazyInitializer.getImplementation(LazyInitializer.java:164)
at net.sf.hibernate.proxy.CGLIBLazyInitializer.intercept(CGLIBLazyInitializer.java:108)
at com.atlassian.confluence.core.ContentEntityObject$$EnhancerByCGLIB$$cc2f5557.hashCode(<generated>)
at java.util.HashMap.hash(HashMap.java:261)
at java.util.HashMap.containsKey(HashMap.java:339)
at com.atlassian.confluence.importexport.impl.XMLDatabinder.toGenericXML(XMLDatabinder.java:155)


## 原因

One or more records exist in the database in which there's a reference to an ID value that violates a foreign key constraint.  For example, a record in the CONTENT table might include a page ID value for which there is no record with a matching content ID.  This can be caused by a missing table constraint, corrupt internal data or corrupt data imported from a Cloud instance.

## ソリューション

### Instructions to fix known issues

The following are knowledge base articles that have identified known causes for this error:

### If the issue is not related to one of the above

If the articles above do not pertain to the issue at hand or resolve it, we'll need to manually identify the cause. To work out where the data corruption exists, our approach will be to:

• increase the information logged during backup
• edit the invalid database entry(ies)

Additionally, please check that the correct transaction isolation level is set if MySQL or SQL Server is in use.

To proceed:

1. Confluence を停止します。
2. 外部データベースがある場合、データベース管理ツールを使用して手動データベース バックアップを作成します。
3. Backup your Confluence home directory as this, with the database backup, can be used to restore the whole site.
4. Open the <Confluence Install>/confluence/WEB-INF/classes/log4j.properties and add these lines to the bottom of the file and save:

log4j.logger.com.atlassian.hibernate.extras.XMLDatabinder=DEBUG, confluencelog
log4j.additivity.com.atlassian.hibernate.extras.XMLDatabinder=false
5. (optional) Locate the <confluence-home-folder>/logs/atlassian-confluence.log.  Move or delete all existing Confluence logs to make it easier to find the relevant logging output.
6. Confluence を再起動してログインします。
7. Start a site backup so that the error reoccurs.
8. Now, check the <confluence-home-folder>/logs/atlassian-confluence.log file to find out what object could not be converted into XML format by opening it and scrolling towards the bottom.
9. Prior to the error that causes the backup to fail, there should be a large number of DEBUG messages indicating that objects are being written.

10. Following these, in newer versions of Confluence, there should be a line like the following indicating the error. We'll call this Message Type 1:

2020-06-15 15:30:25,981 DEBUG [https-jsse-nio2-443-exec-14] [atlassian.hibernate.extras.XMLDatabinder] writeObject Writing object: com.atlassian.confluence.security.ContentPermissionSet with ID: 106201164 to XML.
2020-06-15 15:30:27,490 ERROR [https-jsse-nio2-443-exec-14] [confluence.importexport.impl.AbstractXmlExporter] backupEntities Couldn't backup database data.
org.hibernate.ObjectNotFoundException: No row with the given identifier exists: [com.atlassian.confluence.core.ContentEntityObject#106708994]
11. In other versions of Confluence, you may messaging similar to this.  We'll call this Message Type 2:

2005-08-24 00:00:33,743 DEBUG [DOCPRIV2:confluence.importexport.impl.XMLDatabinder] Writing object:
com.atlassian.confluence.core.ContentPermission with ID: 5 to XML.
2005-08-24 00:00:33,743 DEBUG [DOCPRIV2:confluence.importexport.impl.XMLDatabinder] Writing property: type
2005-08-24 00:00:33,743 DEBUG [DOCPRIV2:confluence.importexport.impl.XMLDatabinder] Writing property: group
2005-08-24 00:00:33,743 DEBUG [DOCPRIV2:confluence.importexport.impl.XMLDatabinder] Writing property: expiry
2005-08-24 00:00:33,743 DEBUG [DOCPRIV2:confluence.importexport.impl.XMLDatabinder] Writing property: content
[DOCPRIV2:ERROR] LazyInitializer - Exception initializing proxy <net.sf.hibernate.ObjectNotFoundException:
No row with the given identifier exists: 2535,
of class: com.atlassian.confluence.core.ContentEntityObject>net.sf.hibernate.ObjectNotFoundException:
No row with the given identifier exists: 2535, of class: com.atlassian.confluence.core.ContentEntityObject
at net.sf.hibernate.ObjectNotFoundException.throwIfNull(ObjectNotFoundException.java:24)
at net.sf.hibernate.proxy.LazyInitializer.initialize(LazyInitializer.java:53)
at net.sf.hibernate.proxy.LazyInitializer.initializeWrapExceptions(LazyInitializer.java:60)
at net.sf.hibernate.proxy.LazyInitializer.getImplementation(LazyInitializer.java:164)
at net.sf.hibernate.proxy.CGLIBLazyInitializer.intercept(CGLIBLazyInitializer.java:108)
at com.atlassian.confluence.core.ContentEntityObject$$EnhancerByCGLIB$$cc2f5557.hashCode(<generated>)
at java.util.HashMap.hash(HashMap.java:261)
at java.util.HashMap.containsKey(HashMap.java:339)
at com.atlassian.confluence.importexport.impl.XMLDatabinder.toGenericXML(XMLDatabinder.java:155)
12. From here, our troubleshooting will take somewhat different paths depending on the type of messaging found.

#### Message Type 1 Troubleshooting

As explained earlier, the value referenced by the ObjectNotFoundException message is a child value without a corresponding parent value.  In the above example message, the value 106708994 doesn't appear to have an associated contentid value in the CONTENT table.  Finding the record(s) in question can be a bit tricky as the messaging doesn't clearly explain which tables are involved.

To help find these records, execute the following queries against the Confluence database.  While these should help find the record(s) in question, they will also bring to light the extent to which these orphaned child values are a problem:

SELECT * FROM CONTENT WHERE PAGEID NOT IN (SELECT CONTENTID FROM CONTENT);

SELECT * FROM CONTENT WHERE PARENTID NOT IN (SELECT CONTENTID FROM CONTENT);

SELECT * FROM CONTENT WHERE PREVVER NOT IN (SELECT CONTENTID FROM CONTENT);

SELECT * from USERCONTENT_RELATION WHERE TARGETCONTENTID NOT IN (SELECT CONTENTID FROM CONTENT);

SELECT * FROM NOTIFICATIONS WHERE CONTENTID NOT IN (SELECT CONTENTID FROM CONTENT);

If a large number of records are returned by these queries, then that could indicate that a table constraint is missing.  In this case, a check of the table constraints would be needed and a support request should be created that includes the latest logs and query results.

Alternatively, if these queries return only one or several records, then the problem is most likely isolated and can be addressed on a one-off basis.  For instance, if the page ID values does not match any content ID in the CONTENT table and the records containing these values aren't accessible from the UI (by way of the page title or pageID, if present), then set the page ID values to NULL and then reattempt the backup.   If there are doubts as to how to proceed, create a support request and include the latest logs and query results.

If any changes are made, be sure to note what was changed and make sure that a database backup is on hand.

#### Message Type 2 Troubleshooting

1. DbVisualizer などの DBA ツールを開き、データベース インスタンスに接続します。スキーマ内のテーブル名をスキャンします。これらのテーブルのいずれかの行を編集する必要があります。
2. To work out which table, open atlassian-confluence.log, check the first line of the exception. This says there was an error writing the ContentPermission object with id 5 into XML. This translates as the row with primary key 5 in the CONTENTLOCK table needs fixing. To work out what table an object maps to in the database, here's a rough guide:
3. Now, find the primary key of the incorrect row in this table. In this case, you can check the first line and see that the row has a primary key of 5.
4. Each property is written to a column, so the last property that was being written has the incorrect value. The row being written to when the exception was thrown was CONTENT (line 5) with a value of 2535 (line 6). Now you know the column and value. This value 2535 is the ID of an entry that no longer exists.