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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-4072) shutdown with incorrect permission on log files shows java.lang.NullPointerException at org.apache.derby.impl.store.raw.log.LogToFile.flush(LogToFile.java:3964). Should give bettter message.
Date Fri, 27 Feb 2009 21:29:12 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4072?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Kathey Marsden updated DERBY-4072:

    Attachment: derby-4072_diff.txt

Attached is a proposed path to improve the error logging when an error gaining write access
to the log files causes the database status to change to read only (derby-4072_diff.txt)

Attached also is a sample derby.log showing the new warning.

I confirmed that for a totally read only database we just get  the READ ONLY boot message
and these warnings don't show up.

I am running test now.

Sorry for originally accidentally attaching this to DERBY-4077. Can't seem to keep my Jira
issues straight today.

> shutdown with incorrect permission on log files shows java.lang.NullPointerException
 at org.apache.derby.impl.store.raw.log.LogToFile.flush(LogToFile.java:3964).  Should give
bettter message.
> ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>                 Key: DERBY-4072
>                 URL: https://issues.apache.org/jira/browse/DERBY-4072
>             Project: Derby
>          Issue Type: Bug
>          Components: Store
>    Affects Versions:,,,,
>            Reporter: Kathey Marsden
>            Assignee: Kathey Marsden
>            Priority: Minor
>         Attachments: ConnectAndShutdown.java, derby-4072_diff.txt, InsertALot.java, MakeDB.java,
> I recently saw  case where a user was seeing the following error in the derby.log when
trying to shutdown their database.
> New exception raised during cleanup null
> java.lang.NullPointerException
>         at org.apache.derby.impl.store.raw.log.LogToFile.flush(LogToFile.java:3964)
>         at org.apache.derby.impl.store.raw.log.LogToFile.flush(LogToFile.java:1781)
>         at org.apache.derby.impl.store.raw.data.BaseDataFileFactory.flush(BaseDataFileFa
>         at org.apache.derby.impl.store.raw.data.CachedPage.writePage(CachedPage.java:761
>         at org.apache.derby.impl.store.raw.data.CachedPage.clean(CachedPage.java:610)
>         at org.apache.derby.impl.services.cache.ConcurrentCache.cleanAndUnkeepEntry(Conc
>         at org.apache.derby.impl.services.cache.ConcurrentCache.cleanCache(ConcurrentCac
>         at org.apache.derby.impl.services.cache.ConcurrentCache.cleanAll(ConcurrentCache
>         at org.apache.derby.impl.services.cache.ConcurrentCache.shutdown(ConcurrentCache
>         at org.apache.derby.impl.store.raw.data.BaseDataFileFactory.stop(BaseDataFileFac
>         at org.apache.derby.impl.services.monitor.TopService.stop(TopService.java:405)
>         at org.apache.derby.impl.services.monitor.TopService.shutdown(TopService.java:34
>         at org.apache.derby.impl.services.monitor.BaseMonitor.shutdown(BaseMonitor.java:
>         at org.apache.derby.impl.db.DatabaseContextImpl.cleanupOnError(DatabaseContextIm
>         at org.apache.derby.iapi.services.context.ContextManager.cleanupOnError(ContextM
>         at org.apache.derby.impl.jdbc.TransactionResourceImpl.cleanupOnError(Transaction
>         at org.apache.derby.impl.jdbc.EmbedConnection.<init>(EmbedConnection.java:584)
>         at org.apache.derby.jdbc.Driver40.getNewEmbedConnection(Driver40.java:68)
>         at org.apache.derby.jdbc.InternalDriver.connect(InternalDriver.java:238)
>         at org.apache.derby.jdbc.AutoloadedDriver.connect(AutoloadedDriver.java:119)
>         at java.sql.DriverManager.getConnection(DriverManager.java:316)
>         at java.sql.DriverManager.getConnection(DriverManager.java:273)
> It ended up that some of the log files did not have proper write permissions because
some operation on the database had been performed by root.   They had subsequently deleted
their db.lck file so the database did not boot READ ONLY as it would if the root owned db.lck
file still existed and the symptom was that they got this error on shutdown.
> Clearly this was user error, but it would have been good if we gave a better error message.
 To reproduce on Linux:
> As a user with umask 0022, run the program 
> java MakeDB
> this will make the databases wombat and create a table.
> su root
> with umask 0022, run the program to insert data and remove the db.lck file:
> java InsertALot
> rm wombat/db.lck
> go back to the original user
> run the program:
> java ConnectAndShutdown
> The application gets the normal shutdown exception but if you look in derby.log you will
see the exception.
> java.lang.NullPointerException
>         at org.apache.derby.impl.store.raw.log.LogToFile.flush(LogToFile.java:3964)
>         ...
> I will attach the files.

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