ModeShape repository data corrupted-can it be recovered?

[m.jawwad]

Hi,

     I am using ModeShape 4.0.0 Final in our web application on Tomcat. The repository seemed to be working fine untill yesterday and we had some precious data inside ModeShape,

The server threw the following exception during restart:

Error while starting 'DataRepository' repository: 86cfc44317f1e7/jcr:system/mode:indexes/local/index

2015-04-09 18:51:58.118 INFO  [main] SLF4JLoggerImpl.java:182	ModeShape version 4.0.0.Final
2015-04-09 18:52:02.260 ERROR [main] SLF4JLoggerImpl.java:166	Error while refreshing index definitions for the "DataRepository" repository

java.lang.NullPointerException: null

    at org.modeshape.jcr.SystemContent.readIndexDefinition(SystemContent.java:516) ~[modeshape-jcr-4.0.0.Final.jar:4.0.0.Final]

    at org.modeshape.jcr.SystemContent.readAllIndexDefinitions(SystemContent.java:572) ~[modeshape-jcr-4.0.0.Final.jar:4.0.0.Final]

    at org.modeshape.jcr.RepositoryIndexManager.readIndexDefinitions(RepositoryIndexManager.java:747) [modeshape-jcr-4.0.0.Final.jar:4.0.0.Final]

    at org.modeshape.jcr.RepositoryIndexManager.register(RepositoryIndexManager.java:318) [modeshape-jcr-4.0.0.Final.jar:4.0.0.Final]

    at org.modeshape.jcr.RepositoryIndexManager.<init>(RepositoryIndexManager.java:134) [modeshape-jcr-4.0.0.Final.jar:4.0.0.Final]

    at org.modeshape.jcr.RepositoryQueryManager.<init>(RepositoryQueryManager.java:86) [modeshape-jcr-4.0.0.Final.jar:4.0.0.Final]

    at org.modeshape.jcr.JcrRepository$RunningState.<init>(JcrRepository.java:1204) [modeshape-jcr-4.0.0.Final.jar:4.0.0.Final]

    at org.modeshape.jcr.JcrRepository$RunningState.<init>(JcrRepository.java:977) [modeshape-jcr-4.0.0.Final.jar:4.0.0.Final]

    at org.modeshape.jcr.JcrRepository.doStart(JcrRepository.java:386) [modeshape-jcr-4.0.0.Final.jar:4.0.0.Final]

    at org.modeshape.jcr.JcrRepository.login(JcrRepository.java:650) [modeshape-jcr-4.0.0.Final.jar:4.0.0.Final]

    at org.modeshape.jcr.JcrRepository.login(JcrRepository.java:611) [modeshape-jcr-4.0.0.Final.jar:4.0.0.Final]

    at org.modeshape.jcr.JcrRepository.login(JcrRepository.java:143) [modeshape-jcr-4.0.0.Final.jar:4.0.0.Final]

...

...

...

Error while starting 'DataRepository' repository: 86cfc44317f1e7/jcr:system/mode:indexes/local/index

------------------------------------------------------------

I tried removing and regenerating the indexes but the exception is still there whenever the server starts and the repository is deployed. My DataRepository.json file is also attached.

Can anyone please help?

Regards,

Jawwad Muzaffar

[hchiorean]

Can you please try using 4.2.0.Final ? 4.0.0.Final is an old version and we've fixed numerous bugs since then. If you still see the issue, can you provide some sample code we can look at to track it down ?

The exception itself would seem to indicate that the /jcr:system/mode:indexes area (which is stored in Infinispan) has become corrupted somehow. There's not much more I can tell based on a post-mortem.

[m.jawwad]

Hi,

  Thanks for the response, I tried the latest release Modeshape 4.2.0 but the issue is still the same. Below is the code thats used to deploy the repository:

RepositoryConfiguration config = RepositoryConfiguration.read("DataRepository.json");
repository = engine.deploy(config);   //engine is the instance of ModeShapeEngine
repository.login(); //this throws the above NullpointerException

For your reference I am also providing the repository *.dat and all the configuration files. Please help, Thanks

[hchiorean]

The Infinispan data that you have (the .dat file) is *already* corrupted. There's nothing that can be done about that. Can you reproduce the steps required to actually corrupt the data ? If yes, that's something which we can investigate and if there's a bug try to fix it.

[m.jawwad]

Hi,

     ok, I think this has happened somewhere stopping the tomcat server  I am trying to reproduce the scenario. Actually, the repos are deployed (using the above mentioned code)  at tomcat startup and the repos are shutdown when the server is stopped. Is there a way for us to see modeshape event logs?

     Moreover, are there any suggestions or recommended configurations that can be make ModeShape more resilient & stable?

[hchiorean]

The overall configuration looks fine; the only thing which shouldn't really be there is Infinispan's transaction manager: transactionManagerLookupClass="org.infinispan.transaction.lookup.DummyTransactionManagerLookup". In a real system, you should be using a real tx manager (e.g. JBoss JTA). However, I don't necessarily think that is the cause for the problem you're seeing.

So ideally you should try reproducing the problem using 4.2.0.Final and this configuration.