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https://issues.apache.org/jira/browse/DERBY-1599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12539140
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Kathey Marsden commented on DERBY-1599:
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For DERBY-721 we decided that users are not allowed to call getCharacterStream
twice on the same column for the same row. Should it not then follow that you
can't call both getCharacterStream and updateCharacterStream?
> Clob.getSubString() throws NullPointerException when created by updatable
> result set
> ------------------------------------------------------------------------------------
>
> Key: DERBY-1599
> URL: https://issues.apache.org/jira/browse/DERBY-1599
> Project: Derby
> Issue Type: Bug
> Components: JDBC, Network Client
> Affects Versions: 10.1.3.1, 10.2.1.6
> Reporter: Knut Anders Hatlen
> Priority: Minor
> Attachments: Repro.java
>
>
> If you create a clob value with one of the ResultSet.updateXXX methods that
> take a stream or a reader, and retrieve that value with ResultSet.getClob(),
> a NullPointerException will be thrown when getSubString() is called on the
> returned Clob object. This happens with the network client driver, and it has
> been observed on Derby 10.1.3.1 and trunk.
> Exception in thread "main" java.lang.NullPointerException
> at org.apache.derby.client.am.Clob.getSubStringX(Clob.java:229)
> at org.apache.derby.client.am.Clob.getSubString(Clob.java:210)
> at Repro.main(Repro.java:24)
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