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https://issues.apache.org/jira/browse/DERBY-3202?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vemund Østgaard updated DERBY-3202:
-----------------------------------

    Attachment: 3202-vistaproblem-diffv2.stat
                3202-vistaproblem-diffv2

That certainly was a better solution, apparently the flushing works fine it is 
just File.length() that is buggy in certain circumstances. 

Here is a new patch using your approach instead. Hopefully this works on all 
other configurations as well, I tested a few and it looked good.

> 'AccessControlException: access denied (java.io.FilePermission 
> C:\....\file-2.log read)' in ErrorStreamTest.
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-3202
>                 URL: https://issues.apache.org/jira/browse/DERBY-3202
>             Project: Derby
>          Issue Type: Bug
>          Components: Regression Test Failure, Test
>    Affects Versions: 10.4.0.0
>         Environment: OS: Windows
> JVM: Sun Microsystems Inc. 1.5.0, Sun Microsystems Inc. 1.4.2
>            Reporter: Ole Solberg
>            Assignee: Vemund Østgaard
>             Fix For: 10.4.0.0
>
>         Attachments: 3202-diff, 3202-diff.stat, 3202-vistaproblem-diff, 
> 3202-vistaproblem-diff.stat, 3202-vistaproblem-diffv2, 
> 3202-vistaproblem-diffv2.stat
>
>
> Seen on Windows only.
> See e.g. 
> http://dbtg.thresher.com/derby/test/Daily/jvm1.6/testing/Limited/testSummary-594211.html
>  : vista, w2003.
> suitesAll fail *************************************************************
> 1) 
> testFile(org.apache.derbyTesting.functionTests.tests.engine.ErrorStreamTest)java.security.AccessControlException:
>  access denied (java.io.FilePermission 
> C:\cludev\jagtmp\autoderbyN_regression\suitesAll_30\log\system\file-2.log 
> read)
> 2) 
> testWrongFile(org.apache.derbyTesting.functionTests.tests.engine.ErrorStreamTest)java.security.AccessControlException:
>  access denied (java.io.FilePermission 
> C:\cludev\jagtmp\autoderbyN_regression\suitesAll_30\log\system\foo\file-3.log 
> read)
> 3) 
> testFileOverMethod(org.apache.derbyTesting.functionTests.tests.engine.ErrorStreamTest)java.security.AccessControlException:
>  access denied (java.io.FilePermission 
> C:\cludev\jagtmp\autoderbyN_regression\suitesAll_30\log\system\file-8.log 
> read)
> 4) 
> testFileOverField(org.apache.derbyTesting.functionTests.tests.engine.ErrorStreamTest)java.security.AccessControlException:
>  access denied (java.io.FilePermission 
> C:\cludev\jagtmp\autoderbyN_regression\suitesAll_30\log\system\file-9.log 
> read)
> 5) 
> testFileOverMethodAndField(org.apache.derbyTesting.functionTests.tests.engine.ErrorStreamTest)java.security.AccessControlException:
>  access denied (java.io.FilePermission 
> C:\cludev\jagtmp\autoderbyN_regression\suitesAll_30\log\system\file-10.log 
> read)
> 1) 
> testDefault(org.apache.derbyTesting.functionTests.tests.engine.ErrorStreamTest)junit.framework.AssertionFailedError:
>  File 
> C:\cludev\jagtmp\autoderbyN_regression\suitesAll_30\log\system\derby.log 
> could not be deleted
> 2) 
> testMethod(org.apache.derbyTesting.functionTests.tests.engine.ErrorStreamTest)junit.framework.AssertionFailedError:
>  assertNotEmpty 
> failed:C:\cludev\jagtmp\autoderbyN_regression\suitesAll_30\log\system\method-4.log
> suitesAll fail *************************************************************
> 1) 
> testFile(org.apache.derbyTesting.functionTests.tests.engine.ErrorStreamTest)java.security.AccessControlException:
>  access denied (java.io.FilePermission 
> C:\cludev\jagtmp\autoderbyN_regression\suitesAll_30\log\system\file-2.log 
> read)
>       at 
> java.security.AccessControlContext.checkPermission(AccessControlContext.java:323)
>       at 
> java.security.AccessController.checkPermission(AccessController.java:546)
>       at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
>       at java.lang.SecurityManager.checkRead(SecurityManager.java:871)
>       at java.io.File.exists(File.java:731)
>       at java.io.Win32FileSystem.canonicalize(Win32FileSystem.java:402)
>       at java.io.File.getCanonicalPath(File.java:559)
>       at 
> org.apache.derbyTesting.functionTests.tests.engine.ErrorStreamTest.testFile(ErrorStreamTest.java:140)
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>       at 
> org.apache.derbyTesting.junit.BaseTestCase.runBare(BaseTestCase.java:95)
> ++

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