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From "Knut Anders Hatlen (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5470) Intermittent NPE executing a prepared statement inserting a blob.
Date Wed, 19 Oct 2011 06:51:10 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13130402#comment-13130402
] 

Knut Anders Hatlen commented on DERBY-5470:
-------------------------------------------

The NullPointerException is thrown by org.apache.commons.io.input.ProxyInputStream, which
is not a Derby class. Assuming your version of the class looks something like this

http://svn.apache.org/viewvc/commons/proper/io/tags/commons-io-2.1/src/main/java/org/apache/commons/io/input/ProxyInputStream.java?view=markup

I think the NullPointerException happens because the underlying stream (the field "in") is
null. I don't think there's any way Derby can set that field to null, so I would suspect that
your application somehow passes null to ProxyInputStream's constructor.

If you modify the application class that overrides ProxyInputStream (assuming that's how you
use it) and make its constructor throw a NullPointerException if the passed in stream is null,
you might get a better indication of what's going wrong.
                
> Intermittent NPE executing a prepared statement inserting a blob.
> -----------------------------------------------------------------
>
>                 Key: DERBY-5470
>                 URL: https://issues.apache.org/jira/browse/DERBY-5470
>             Project: Derby
>          Issue Type: Bug
>          Components: Store
>    Affects Versions: 10.8.1.2
>         Environment: Linux 64-bit, java 1.6 build 26.
>            Reporter: Benson Margulies
>
> We cannot reproduce this consistently, let alone minimize it for you. However, the backtrace
may be suggestive enough to give you some traction.
> I have never been able to repro this on a Mac with the corresponding version of Java.

> {noformat}
> Caused by: java.lang.NullPointerException
> 	at org.apache.commons.io.input.ProxyInputStream.read(ProxyInputStream.java:75)
> 	at java.io.FilterInputStream.read(FilterInputStream.java:116)
> 	at org.apache.derby.iapi.services.io.LimitInputStream.read(Unknown Source)
> 	at org.apache.derby.iapi.types.RawToBinaryFormatStream.read(Unknown Source)
> 	at org.apache.derby.impl.store.raw.data.MemByteHolder.write(Unknown Source)
> 	at org.apache.derby.impl.store.raw.data.RememberBytesInputStream.fillBuf(Unknown Source)
> 	at org.apache.derby.impl.store.raw.data.StoredPage.logColumn(Unknown Source)
> 	at org.apache.derby.impl.store.raw.data.StoredPage.logRow(Unknown Source)
> 	at org.apache.derby.impl.store.raw.data.InsertOperation.writeOptionalDataToBuffer(Unknown
Source)
> 	at org.apache.derby.impl.store.raw.data.InsertOperation.<init>(Unknown Source)
> 	at org.apache.derby.impl.store.raw.data.LoggableActions.actionInsert(Unknown Source)
> 	at org.apache.derby.impl.store.raw.data.BasePage.insertNoOverflow(Unknown Source)
> 	at org.apache.derby.impl.store.raw.data.BasePage.insertAtSlot(Unknown Source)
> 	at org.apache.derby.impl.store.raw.data.StoredPage.insertAtSlot(Unknown Source)
> 	at org.apache.derby.impl.store.raw.data.BasePage.insert(Unknown Source)
> 	at org.apache.derby.impl.store.access.heap.HeapController.doInsert(Unknown Source)
> 	at org.apache.derby.impl.store.access.heap.HeapController.insertAndFetchLocation(Unknown
Source)
> 	at org.apache.derby.impl.sql.execute.RowChangerImpl.insertRow(Unknown Source)
> 	at org.apache.derby.impl.sql.execute.InsertResultSet.normalInsertCore(Unknown Source)
> 	at org.apache.derby.impl.sql.execute.InsertResultSet.open(Unknown Source)
> 	at org.apache.derby.impl.sql.GenericPreparedStatement.executeStmt(Unknown Source)
> 	at org.apache.derby.impl.sql.GenericPreparedStatement.execute(Unknown Source)
> {noformat}

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