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From "Mamta A. Satoor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5421) NullPointerException during system.nstest.utils.Dbutil.update_one_row
Date Tue, 20 Sep 2011 18:03:09 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13108868#comment-13108868
] 

Mamta A. Satoor commented on DERBY-5421:
----------------------------------------

I did a quick glance at the code around the null pointer exception area nstest.utils.DbUtil.update_one_row(DbUtil.java:275)
and found that in case of exception, we do following
	} catch (Exception e) {
		ps2.close();
		printException(
				"closing update prepared stmt in dbUtil.update_one_row() ",
				e);

One definite improvement to the test would be to first print the exception and then do the
ps2.close so we know what was the exact exception. But this is for future runs. Myrna I think
already mentioned that when the test gets run next time, she will run it with more diagnostic
properties like derby.language.logStatementText=true and derby.stream.error.logSeverityLevel=0

> NullPointerException during system.nstest.utils.Dbutil.update_one_row
> ---------------------------------------------------------------------
>
>                 Key: DERBY-5421
>                 URL: https://issues.apache.org/jira/browse/DERBY-5421
>             Project: Derby
>          Issue Type: Bug
>    Affects Versions: 10.8.2.1
>            Reporter: Myrna van Lunteren
>
> The nstest - both embedded (on Windows XP) and client/server configuration (on SUSE Linux
10) ran into a NullPointerException during the call to update_one_row.
> The test only ran for 5 days, vs. 10.8.1.2 8 days, and I've never seen this error before:
> sample (console) output:
> total memory: 20962816 free: 3036264 Wed Sep 14 00:28:00 PDT 2011
> TObj -->NULL error message detected
> TObj -->Here is the NULL exception - java.lang.NullPointerException
> TObj -->Stack trace of the NULL exception - java.lang.NullPointerException
>         at org.apache.derbyTesting.system.nstest.utils.DbUtil.update_one_row(DbUtil.java:275)
>         at org.apache.derbyTesting.system.nstest.tester.TesterObject.doIUDOperation(TesterObject.java:162)
>         at org.apache.derbyTesting.system.nstest.tester.Tester2.startTesting(Tester2.java:109)
>         at org.apache.derbyTesting.system.nstest.NsTest.run(NsTest.java:555)
> TObj -->At this point - executing update_one_row, exception thrown was : null
> TObj -->NULL error message detected
> TObj -->Here is the NULL exception - java.lang.NullPointerException
> TObj -->Stack trace of the NULL exception - java.lang.NullPointerException
>         at org.apache.derbyTesting.system.nstest.utils.DbUtil.update_one_row(DbUtil.java:275)
>         at org.apache.derbyTesting.system.nstest.tester.TesterObject.doIUDOperation(TesterObject.java:162)
>         at org.apache.derbyTesting.system.nstest.tester.Tester1.startTesting(Tester1.java:118)
>         at org.apache.derbyTesting.system.nstest.NsTest.run(NsTest.java:551)
> TObj -->At this point - executing update_one_row, exception thrown was : null
>  
> Looking at the source of nstest.utils.DbUtil.update_one_row it's calling ps2.close():
> ----------------------------
> ....
> 		column = colnames[ind % NUMTYPES]; // randomly gets one of the columns
> 		// of the table
> 		
> 		try {
> 			
> 			ps2 = conn.prepareStatement(" update nstesttab set " + column
> 					+ " = ? " + " where serialkey = " + skey);
> 			
> 		} catch (Exception e) {
> 			ps2.close();
> 			printException(
> 					"closing update prepared stmt in dbUtil.update_one_row() ",
> 					e);
> 			return rowsUpdated;
> 		}
> ....
> ----------------------------
> At first glance, this seems a test issue, but I think it possible the test is hiding
something more interesting, so I'm not marking this as component 'test'.

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