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From Mark Davis <...@netvisage.net>
Subject Re: FAQ language (was: Unable to run 10.0.2 GA on Mac OS X 10.3.5/VM 1.4.2_05)
Date Sun, 10 Oct 2004 22:22:01 GMT
This is probably orthogonal to the current discussion but what changes 
were made to derby to cause this problem? The original cloudscape beta 
does not exhibit this behavior on OS X.


Samuel Andrew McIntyre wrote:

> Hi Joseph,
> Here is a copy of the bug report I filed with Apple:
> Summary:
> java.io.RandomAccessFile in Java 1.4.2 Update 1 does not allow 
> reopening files in "rws" mode if they have just been created. When a 
> file is created with "rw" and then shortly thereafter a new 
> RandomAccessFile object is instantiated for the same file in "rws" 
> mode, the JVM throws a FileNotFoundException (File Exists). "rw" and 
> "rwd" modes do not have this problem. This issue is hit when 
> attempting to create or write to a database with IBM Cloudscape/Apache 
> Derby 10.0.
> Steps to reproduce:
> A testcase which reproduces the problem is attached. I can provide 
> jars for Cloudscape/Derby if desired.
> Expected results:
> When using Cloudscape/Derby, it is expected that the database will be 
> created with no exceptions thrown. In general, it is expected that on 
> the second instantiation of RandomAccessFile, the object will be 
> created without an exception being thrown.
> Actual Results:
> When using Cloudscape/Derby, the database is not created, and 
> Cloudscape shutdowns with an exception. With the provided testcase, 
> the following exception is thrown:
> Exception in thread "main" java.io.FileNotFoundException: log.dat 
> (File exists)
>        at java.io.RandomAccessFile.open(Native Method)
>        at java.io.RandomAccessFile.<init>(RandomAccessFile.java:204)
>        at TestWriteSync.main(TestWriteSync.java:24)
> Workaround:
> For Cloudscape/Derby, the workaround is to set our property 
> derby.storage.fileSyncTransactionLog=true to avoid the code path which 
> uses "rws" mode.
> Isolation:
> I am not currently able to test this on other setups.
> The testcase referenced above is Suresh's TestWriteSync.java.
> andrew

One is what One does.
Mark W. Davis

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